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Windows Analysis Report Justificante de Pago 25112021.pdf _.exe

Overview

General Information

Sample Name:	Justificante de Pago 25112021.pdf _.exe
Analysis ID:	528616
MD5:	494cd8be1913f9def79b10031587aa8a
SHA1:	ff74b67fa7c03d4fb388f49289ff14639656b3d3
SHA256:	75934da02313e0d772b4703bfaa3331311fc5a2b981f8ff0e455795bc3448ddb
Tags:	exeguloader
Infos:
Most interesting Screenshot:

Detection

GuLoader

Score:	84
Range:	0 - 100
Whitelisted:	false
Confidence:	100%

Signatures

Found malware configuration

Potential malicious icon found

Multi AV Scanner detection for submitted file

Yara detected GuLoader

Initial sample is a PE file and has a suspicious name

C2 URLs / IPs found in malware configuration

Found potential dummy code loops (likely to delay analysis)

Uses 32bit PE files

Sample file is different than original file name gathered from version info

PE file contains strange resources

Contains functionality to read the PEB

Uses code obfuscation techniques (call, push, ret)

Detected potential crypto function

PE / OLE file has an invalid certificate

Contains functionality to call native functions

Program does not show much activity (idle)

Contains functionality for execution timing, often used to detect debuggers

Abnormal high CPU Usage

Classification

Process Tree

System is w10x64

Justificante de Pago 25112021.pdf _.exe (PID: 6016 cmdline: "C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe" MD5: 494CD8BE1913F9DEF79B10031587AA8A)

cleanup

Malware Configuration

Threatname: GuLoader

{"Payload URL": "https://onedrive.live.com/download?c"}

Yara Overview

Memory Dumps

Source	Rule	Description	Author	Strings
00000000.00000002.1185369693.0000000002980000.00000040.00000001.sdmp	JoeSecurity_GuLoader_2	Yara detected GuLoader	Joe Security

Sigma Overview

No Sigma rule has matched

Jbx Signature Overview

Click to jump to signature section

Show All Signature Results

AV Detection:

Found malware configuration

Show sources

Source: 00000000.00000002.1185369693.0000000002980000.00000040.00000001.sdmp

Malware Configuration Extractor: GuLoader {"Payload URL": "https://onedrive.live.com/download?c"}

Multi AV Scanner detection for submitted file

Show sources

Source: Justificante de Pago 25112021.pdf _.exe

ReversingLabs: Detection: 17%

Source: Justificante de Pago 25112021.pdf _.exe

Static PE information: LOCAL_SYMS_STRIPPED, 32BIT_MACHINE, EXECUTABLE_IMAGE, LINE_NUMS_STRIPPED, RELOCS_STRIPPED

Source:

Binary string: C:\Program Files (x86)\Administrator-Cloud\Projects\SKIBSBES.pdb source: Justificante de Pago 25112021.pdf _.exe

Networking:

C2 URLs / IPs found in malware configuration

Show sources

Source: Malware configuration extractor

URLs: https://onedrive.live.com/download?c

Source: Justificante de Pago 25112021.pdf _.exe	String found in binary or memory: http://s.symcb.com/universal-root.crl0
Source: Justificante de Pago 25112021.pdf _.exe	String found in binary or memory: http://s.symcd.com06
Source: Justificante de Pago 25112021.pdf _.exe	String found in binary or memory: http://ts-aia.ws.symantec.com/sha256-tss-ca.cer0(
Source: Justificante de Pago 25112021.pdf _.exe	String found in binary or memory: http://ts-crl.ws.symantec.com/sha256-tss-ca.crl0
Source: Justificante de Pago 25112021.pdf _.exe	String found in binary or memory: http://ts-ocsp.ws.symantec.com0;
Source: Justificante de Pago 25112021.pdf _.exe	String found in binary or memory: https://d.symcb.com/cps0%
Source: Justificante de Pago 25112021.pdf _.exe	String found in binary or memory: https://d.symcb.com/rpa0
Source: Justificante de Pago 25112021.pdf _.exe	String found in binary or memory: https://d.symcb.com/rpa0.

System Summary:

Potential malicious icon found

Show sources

Source: initial sample

Icon embedded in PE file: bad icon match: 20047c7c70f0e004

Initial sample is a PE file and has a suspicious name

Show sources

Source: initial sample

Static PE information: Filename: Justificante de Pago 25112021.pdf _.exe

Source: Justificante de Pago 25112021.pdf _.exe

Static PE information: LOCAL_SYMS_STRIPPED, 32BIT_MACHINE, EXECUTABLE_IMAGE, LINE_NUMS_STRIPPED, RELOCS_STRIPPED

Source: Justificante de Pago 25112021.pdf _.exe, 00000000.00000000.655922327.0000000000421000.00000002.00020000.sdmp	Binary or memory string: OriginalFilenameSKIBSBES.exe vs Justificante de Pago 25112021.pdf _.exe
Source: Justificante de Pago 25112021.pdf _.exe, 00000000.00000002.1185543904.0000000002A60000.00000004.00000001.sdmp	Binary or memory string: OriginalFilenameSKIBSBES.exeFE2X vs Justificante de Pago 25112021.pdf _.exe
Source: Justificante de Pago 25112021.pdf _.exe	Binary or memory string: OriginalFilenameSKIBSBES.exe vs Justificante de Pago 25112021.pdf _.exe

Source: Justificante de Pago 25112021.pdf _.exe

Static PE information: Resource name: RT_ICON type: GLS_BINARY_LSB_FIRST

Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_00401578
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_0298C889
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_02993C74
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_02992493
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_02988C96
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_0298C486
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_029892AF
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_029828D2
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_029824EB
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_0298061C
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_0298D010
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_02984608
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_0299120B
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_02986E3F
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_0298B45C
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_0299367B
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_0298258D
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_02980386
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_029801EC
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_0298BD14
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_02990937
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_02987555
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_02986557
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_0298AF4E
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_0298DF79
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_0298657D

Source: Justificante de Pago 25112021.pdf _.exe

Static PE information: invalid certificate

Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe

Code function: 0_2_0298C889 NtAllocateVirtualMemory,

Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe

Process Stats: CPU usage > 98%

Source: Justificante de Pago 25112021.pdf _.exe

ReversingLabs: Detection: 17%

Source: Justificante de Pago 25112021.pdf _.exe

Static PE information: Section: .text IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_READ

Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe

Key opened: HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\Safer\CodeIdentifiers

Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe

Section loaded: C:\Windows\SysWOW64\msvbvm60.dll

Source: classification engine

Classification label: mal84.rans.troj.evad.winEXE@1/0@0/0

Source: Justificante de Pago 25112021.pdf _.exe

Static PE information: data directory type: IMAGE_DIRECTORY_ENTRY_DEBUG

Source:

Binary string: C:\Program Files (x86)\Administrator-Cloud\Projects\SKIBSBES.pdb source: Justificante de Pago 25112021.pdf _.exe

Data Obfuscation:

Yara detected GuLoader

Show sources

Source: Yara match

File source: 00000000.00000002.1185369693.0000000002980000.00000040.00000001.sdmp, type: MEMORY

Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_00405661 push ebp; ret
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_004066B9 push ds; ret
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_00403193 push ds; retf
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_0298548B push ebx; ret
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_029854B2 push ebx; ret
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_02987ECB pushfd ; ret
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_02985AFC push ds; ret
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_029824E3 push E2DBE6FFh; retf
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_0298422C push cs; retf
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_02984267 push cs; retf
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_02985FC4 pushad ; iretd
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_029841E0 push cs; retf
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_02985502 push ebx; ret
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_02982B39 push ds; retf
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_02980F43 push ebp; retf

Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Process information set: NOOPENFILEERRORBOX
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Process information set: NOOPENFILEERRORBOX
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Process information set: NOOPENFILEERRORBOX
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Process information set: NOOPENFILEERRORBOX
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Process information set: NOOPENFILEERRORBOX
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Process information set: NOOPENFILEERRORBOX
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Process information set: NOOPENFILEERRORBOX
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Process information set: NOOPENFILEERRORBOX
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Process information set: NOOPENFILEERRORBOX

Source: all processes

Thread injection, dropped files, key value created, disk infection and DNS query: no activity detected

Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe

Code function: 0_2_0298BBE8 rdtsc

Anti Debugging:

Found potential dummy code loops (likely to delay analysis)

Show sources

Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe

Process Stats: CPU usage > 90% for more than 60s

Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_02990098 mov eax, dword ptr fs:[00000030h]
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_02992493 mov eax, dword ptr fs:[00000030h]
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_02990EBD mov eax, dword ptr fs:[00000030h]
Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe	Code function: 0_2_0298B8DD mov eax, dword ptr fs:[00000030h]

Source: all processes

Thread injection, dropped files, key value created, disk infection and DNS query: no activity detected

Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe

Code function: 0_2_0298BBE8 rdtsc

Source: C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe

Code function: 0_2_02993C74 RtlAddVectoredExceptionHandler,

Source: Justificante de Pago 25112021.pdf _.exe, 00000000.00000002.1184735200.0000000000C60000.00000002.00020000.sdmp	Binary or memory string: Program Manager
Source: Justificante de Pago 25112021.pdf _.exe, 00000000.00000002.1184735200.0000000000C60000.00000002.00020000.sdmp	Binary or memory string: Shell_TrayWnd
Source: Justificante de Pago 25112021.pdf _.exe, 00000000.00000002.1184735200.0000000000C60000.00000002.00020000.sdmp	Binary or memory string: Progman
Source: Justificante de Pago 25112021.pdf _.exe, 00000000.00000002.1184735200.0000000000C60000.00000002.00020000.sdmp	Binary or memory string: Progmanlock

Mitre Att&ck Matrix

Initial Access	Execution	Persistence	Privilege Escalation	Defense Evasion	Credential Access	Discovery	Lateral Movement	Collection	Exfiltration	Command and Control	Network Effects	Remote Service Effects	Impact
Valid Accounts	Windows Management Instrumentation	Path Interception	Process Injection1	Virtualization/Sandbox Evasion11	OS Credential Dumping	Security Software Discovery11	Remote Services	Archive Collected Data1	Exfiltration Over Other Network Medium	Encrypted Channel1	Eavesdrop on Insecure Network Communication	Remotely Track Device Without Authorization	Modify System Partition
Default Accounts	Scheduled Task/Job	Boot or Logon Initialization Scripts	Boot or Logon Initialization Scripts	Process Injection1	LSASS Memory	Virtualization/Sandbox Evasion11	Remote Desktop Protocol	Data from Removable Media	Exfiltration Over Bluetooth	Application Layer Protocol1	Exploit SS7 to Redirect Phone Calls/SMS	Remotely Wipe Data Without Authorization	Device Lockout
Domain Accounts	At (Linux)	Logon Script (Windows)	Logon Script (Windows)	Obfuscated Files or Information1	Security Account Manager	Process Discovery1	SMB/Windows Admin Shares	Data from Network Shared Drive	Automated Exfiltration	Steganography	Exploit SS7 to Track Device Location	Obtain Device Cloud Backups	Delete Device Data
Local Accounts	At (Windows)	Logon Script (Mac)	Logon Script (Mac)	Binary Padding	NTDS	System Information Discovery1	Distributed Component Object Model	Input Capture	Scheduled Transfer	Protocol Impersonation	SIM Card Swap		Carrier Billing Fraud

Behavior Graph

Hide Legend

Legend:

Process
Signature
Created File
DNS/IP Info
Is Dropped
Is Windows Process
Number of created Registry Values
Number of created Files
Visual Basic
Delphi
Java
.Net C# or VB.NET
C, C++ or other language
Is malicious
Internet

Screenshots

Thumbnails

This section contains all screenshots as thumbnails, including those not shown in the slideshow.

Antivirus, Machine Learning and Genetic Malware Detection

Initial Sample

Source	Detection	Scanner	Label	Link
Justificante de Pago 25112021.pdf _.exe	18%	ReversingLabs	Win32.Trojan.Lazy

Dropped Files

No Antivirus matches

Unpacked PE Files

No Antivirus matches

Domains

No Antivirus matches

URLs

No Antivirus matches

Domains and IPs

Contacted Domains

No contacted domains info

Contacted URLs

Name	Malicious	Antivirus Detection	Reputation
https://onedrive.live.com/download?c	false		high

Contacted IPs

No contacted IP infos

General Information

Joe Sandbox Version:	34.0.0 Boulder Opal
Analysis ID:	528616
Start date:	25.11.2021
Start time:	15:07:14
Joe Sandbox Product:	CloudBasic
Overall analysis duration:	0h 7m 17s
Hypervisor based Inspection enabled:	false
Report type:	light
Sample file name:	Justificante de Pago 25112021.pdf _.exe
Cookbook file name:	default.jbs
Analysis system description:	Windows 10 64 bit v1803 with Office Professional Plus 2016, Chrome 85, IE 11, Adobe Reader DC 19, Java 8 Update 211
Number of analysed new started processes analysed:	15
Number of new started drivers analysed:	0
Number of existing processes analysed:	0
Number of existing drivers analysed:	0
Number of injected processes analysed:	0
Technologies:	HCA enabled EGA enabled HDC enabled AMSI enabled
Analysis Mode:	default
Analysis stop reason:	Timeout
Detection:	MAL
Classification:	mal84.rans.troj.evad.winEXE@1/0@0/0
EGA Information:	Failed
HDC Information:	Successful, ratio: 26.5% (good quality ratio 11.6%) Quality average: 23.1% Quality standard deviation: 30.7%
HCA Information:	Failed
Cookbook Comments:	Adjust boot time Enable AMSI Found application associated with file extension: .exe Override analysis time to 240s for sample files taking high CPU consumption
Warnings:	Show All Exclude process from analysis (whitelisted): BackgroundTransferHost.exe, backgroundTaskHost.exe, svchost.exe, wuapihost.exe Excluded IPs from analysis (whitelisted): 23.211.6.115 Excluded domains from analysis (whitelisted): ris.api.iris.microsoft.com, e12564.dspb.akamaiedge.net, store-images.s-microsoft.com, ctldl.windowsupdate.com, store-images.s-microsoft.com-c.edgekey.net, displaycatalog.mp.microsoft.com, img-prod-cms-rt-microsoft-com.akamaized.net, arc.msn.com VT rate limit hit for: /opt/package/joesandbox/database/analysis/528616/sample/Justificante de Pago 25112021.pdf _.exe

Simulations

Behavior and APIs

No simulations

Joe Sandbox View / Context

IPs

No context

Domains

No context

ASN

No context

JA3 Fingerprints

No context

Dropped Files

No context

Created / dropped Files

No created / dropped files found

Static File Info

General
File type:	PE32 executable (GUI) Intel 80386, for MS Windows
Entropy (8bit):	6.141971298184264
TrID:	Win32 Executable (generic) a (10002005/4) 99.15% Win32 Executable Microsoft Visual Basic 6 (82127/2) 0.81% Generic Win/DOS Executable (2004/3) 0.02% DOS Executable Generic (2002/1) 0.02% Autodesk FLIC Image File (extensions: flc, fli, cel) (7/3) 0.00%
File name:	Justificante de Pago 25112021.pdf _.exe
File size:	148800
MD5:	494cd8be1913f9def79b10031587aa8a
SHA1:	ff74b67fa7c03d4fb388f49289ff14639656b3d3
SHA256:	75934da02313e0d772b4703bfaa3331311fc5a2b981f8ff0e455795bc3448ddb
SHA512:	620ac0b14cfac47728cc1761d6cb9a50d45e1c050c96e8cf069cfb2729fdac8e257fcdb07db97c71c536b63646a548d956e9ec4614f703bd7f8b8a6803dea4e4
SSDEEP:	1536:q9aYr5MjHE4q7c4BMoDh9t4ooodRRK7bgNmGT4JVom8D/Qy5gy9LE+YJi3hbh:JYCjH7mc4BMtZ742JV4/Qa4J6h
File Content Preview:	MZ......................@...............................................!..L.!This program cannot be run in DOS mode....$........,..SM..SM..SM...Q..RM...o..UM..ek..RM..RichSM..................PE..L..._.XW.....................0......x.............@........

File Icon


Icon Hash:	20047c7c70f0e004

Static PE Info

General
Entrypoint:	0x401578
Entrypoint Section:	.text
Digitally signed:	true
Imagebase:	0x400000
Subsystem:	windows gui
Image File Characteristics:	LOCAL_SYMS_STRIPPED, 32BIT_MACHINE, EXECUTABLE_IMAGE, LINE_NUMS_STRIPPED, RELOCS_STRIPPED
DLL Characteristics:
Time Stamp:	0x57589F5F [Wed Jun 8 22:42:39 2016 UTC]
TLS Callbacks:
CLR (.Net) Version:
OS Version Major:	4
OS Version Minor:	0
File Version Major:	4
File Version Minor:	0
Subsystem Version Major:	4
Subsystem Version Minor:	0
Import Hash:	e6bbebdc7c1418bc1bcdb0dc8a54e696

Authenticode Signature

Signature Valid:	false
Signature Issuer:	E=Beske7@Udtoemtli6.opm, CN=Svrvgtere, OU=faringsa, O=Hepa6, L=MODGAAS, S=Dann4, C=NE
Signature Validation Error:	A certificate chain processed, but terminated in a root certificate which is not trusted by the trust provider
Error Number:	-2146762487
Not Before, Not After	11/24/2021 3:02:10 AM 11/24/2022 3:02:10 AM
Subject Chain	E=Beske7@Udtoemtli6.opm, CN=Svrvgtere, OU=faringsa, O=Hepa6, L=MODGAAS, S=Dann4, C=NE
Version:	3
Thumbprint MD5:	38CEFA178A560F005C02C0AB1CCD5B2C
Thumbprint SHA-1:	6831094E8AE768575C155840ECA02AE1798897CF
Thumbprint SHA-256:	0577BE6AC49E2682236F51DB9FD872B71506301CDBE61148CA0A74BBD6E8C4A4
Serial:	00

Entrypoint Preview

Instruction
push 0041AC48h
call 00007F4B90796BE5h
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
xor byte ptr [eax], al
add byte ptr [eax], al
inc eax
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [ebx+6C541393h], ah
adc byte ptr [edi+40h], ch
mov byte ptr [eax], cl
add eax, EA98183Fh
lock add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add dword ptr [eax], eax
add byte ptr [eax], al
inc ebp
outsb
or eax, 4F52200Ah
dec esp
dec ecx
inc edi
inc ebp
push edx
inc ebp
add byte ptr [edx+2Eh], al
push esp
js 00007F4B90796C67h
inc edx
add byte ptr [eax], al
add byte ptr [eax], al
dec esp
xor dword ptr [eax], eax
sbb ebp, edi
push edx
push esp
xchg eax, ebp
retf
push ebp
cmc
inc esi
cmp dword ptr [ebx+ebx*4+4DA7D9D6h], FFFFFFABh
pop esp
jmp 00007F4B90796C29h
scasd
pop es
pop ds
mov eax, dword ptr [5832A24Ah]
sbb al, 69h
jnl 00007F4B90796BFDh
adc byte ptr [edx], bh
dec edi
lodsd
xor ebx, dword ptr [ecx-48EE309Ah]
or al, 00h
stosb
add byte ptr [eax-2Dh], ah
xchg eax, ebx
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
mov bh, 94h
add dword ptr [eax], eax
inc ebp
add byte ptr [eax], al
add byte ptr [eax], al
or dword ptr [eax], eax
dec ebx
inc esp
inc esp
inc ebp
push edx
push ebx
dec esp
dec edi
push esp
add byte ptr [54000701h], cl
jc 00007F4B90796C53h
outsb
jnc 00007F4B90796C5Fh

Data Directories

Name	Virtual Address	Virtual Size	Is in Section
IMAGE_DIRECTORY_ENTRY_EXPORT	0x0	0x0
IMAGE_DIRECTORY_ENTRY_IMPORT	0x1f8f4	0x28	.text
IMAGE_DIRECTORY_ENTRY_RESOURCE	0x21000	0x11ce	.rsrc
IMAGE_DIRECTORY_ENTRY_EXCEPTION	0x0	0x0
IMAGE_DIRECTORY_ENTRY_SECURITY	0x23058	0x14e8
IMAGE_DIRECTORY_ENTRY_BASERELOC	0x0	0x0
IMAGE_DIRECTORY_ENTRY_DEBUG	0x1160	0x1c	.text
IMAGE_DIRECTORY_ENTRY_COPYRIGHT	0x0	0x0
IMAGE_DIRECTORY_ENTRY_GLOBALPTR	0x0	0x0
IMAGE_DIRECTORY_ENTRY_TLS	0x0	0x0
IMAGE_DIRECTORY_ENTRY_LOAD_CONFIG	0x0	0x0
IMAGE_DIRECTORY_ENTRY_BOUND_IMPORT	0x230	0x20
IMAGE_DIRECTORY_ENTRY_IAT	0x1000	0x154	.text
IMAGE_DIRECTORY_ENTRY_DELAY_IMPORT	0x0	0x0
IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR	0x0	0x0
IMAGE_DIRECTORY_ENTRY_RESERVED	0x0	0x0

Sections

Name	Virtual Address	Virtual Size	Raw Size	Xored PE	ZLIB Complexity	File Type	Entropy	Characteristics
.text	0x1000	0x1ee24	0x1f000	False	0.46585969002	data	6.32767470182	IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_READ
.data	0x20000	0xc24	0x1000	False	0.00634765625	data	0.0	IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_WRITE, IMAGE_SCN_MEM_READ
.rsrc	0x21000	0x11ce	0x2000	False	0.18798828125	data	2.35454948934	IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_READ

Resources

Name	RVA	Size	Type	Language	Country
CUSTOM	0x21910	0x8be	MS Windows icon resource - 1 icon, 32x32	English	United States
RT_ICON	0x217e0	0x130	data
RT_ICON	0x214f8	0x2e8	data
RT_ICON	0x213d0	0x128	GLS_BINARY_LSB_FIRST
RT_GROUP_ICON	0x213a0	0x30	data
RT_VERSION	0x211a0	0x200	data	Chinese	Taiwan

Imports

DLL

Import

MSVBVM60.DLL

_CIcos, _adj_fptan, __vbaVarMove, __vbaFreeVar, __vbaStrVarMove, __vbaFreeVarList, _adj_fdiv_m64, _adj_fprem1, __vbaStrCat, __vbaHresultCheckObj, _adj_fdiv_m32, __vbaAryVar, __vbaAryDestruct, __vbaObjSet, _adj_fdiv_m16i, __vbaObjSetAddref, _adj_fdivr_m16i, __vbaCyStr, __vbaFpR8, _CIsin, __vbaChkstk, EVENT_SINK_AddRef, __vbaStrCmp, __vbaObjVar, __vbaI2I4, _adj_fpatan, __vbaRedim, EVENT_SINK_Release, _CIsqrt, EVENT_SINK_QueryInterface, __vbaFpCmpCy, __vbaExceptHandler, _adj_fprem, _adj_fdivr_m64, __vbaVarErrI4, __vbaFPException, __vbaStrVarVal, _CIlog, __vbaFileOpen, __vbaNew2, _adj_fdiv_m32i, _adj_fdivr_m32i, __vbaStrCopy, __vbaFreeStrList, __vbaDerefAry1, _adj_fdivr_m32, _adj_fdiv_r, __vbaVarTstNe, __vbaLateMemCall, __vbaVarDup, _CIatan, __vbaStrMove, __vbaAryCopy, __vbaCastObj, _allmul, _CItan, _CIexp, __vbaFreeObj, __vbaFreeStr

Version Infos

Description	Data
Translation	0x0404 0x04b0
InternalName	SKIBSBES
FileVersion	1.00
CompanyName
ProductName	THELS
ProductVersion	1.00
OriginalFilename	SKIBSBES.exe

Possible Origin

Language of compilation system	Country where language is spoken	Map
English	United States
Chinese	Taiwan

Network Behavior

No network behavior found

Code Manipulations

Statistics

System Behavior

Analysis Process: Justificante de Pago 25112021.pdf _.exe PID: 6016 Parent PID: 5364

General

Start time:	15:08:08
Start date:	25/11/2021
Path:	C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe
Wow64 process (32bit):	true
Commandline:	"C:\Users\user\Desktop\Justificante de Pago 25112021.pdf _.exe"
Imagebase:	0x400000
File size:	148800 bytes
MD5 hash:	494CD8BE1913F9DEF79B10031587AA8A
Has elevated privileges:	true
Has administrator privileges:	true
Programmed in:	Visual Basic
Yara matches:	Rule: JoeSecurity_GuLoader_2, Description: Yara detected GuLoader, Source: 00000000.00000002.1185369693.0000000002980000.00000040.00000001.sdmp, Author: Joe Security
Reputation:	low

Disassembly

Code Analysis

Reset < >

Description:	Adversaries may inject code into processes in order to evade process-based defenses as well as possibly elevate privileges. Process injection is a method of executing arbitrary code in the address space of a separate live process. Running code in the context of another process may allow access to the process's memory, system/network resources, and possibly elevated privileges. Execution via process injection may also evade detection from security products since the execution is masked under a legitimate process.
Tactics:	Defense Evasion, Privilege Escalation
Data Sources:	API monitoring, DLL monitoring, File monitoring, Named Pipes, Process monitoring
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may employ various means to detect and avoid virtualization and analysis environments. This may include changing behaviors based on the results of checks for the presence of artifacts indicative of a virtual machine environment (VME) or sandbox. If the adversary detects a VME, they may alter their malware to disengage from the victim or conceal the core functions of the implant. They may also search for VME artifacts before dropping secondary or additional payloads. Adversaries may use the information learned from [Virtualization/Sandbox Evasion](https://attack.mitre.org/techniques/T1497) during automated discovery to shape follow-on behaviors.
Tactics:	Defense Evasion, Discovery
Data Sources:	Process command-line parameters, Process monitoring
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may attempt to make an executable or file difficult to discover or analyze by encrypting, encoding, or otherwise obfuscating its contents on the system or in transit. This is common behavior that can be used across different platforms and the network to evade defenses.
Tactics:	Defense Evasion
Data Sources:	Binary file metadata, Email gateway, Environment variable, File monitoring, Malware reverse engineering, Network intrusion detection system, Network protocol analysis, Process command-line parameters, Process monitoring, Process use of network, SSL/TLS inspection, Windows event logs
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may attempt to get a listing of security software, configurations, defensive tools, and sensors that are installed on a system or in a cloud environment. This may include things such as firewall rules and anti-virus. Adversaries may use the information from Security Software Discovery during automated discovery to shape follow-on behaviors, including whether or not the adversary fully infects the target and/or attempts specific actions.
Tactics:	Discovery
Data Sources:	AWS CloudTrail logs, Azure activity logs, File monitoring, Process command-line parameters, Process monitoring, Stackdriver logs
Platforms:	AWS, Azure, Azure AD, GCP, Linux, macOS, Office 365, SaaS, Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may attempt to get information about running processes on a system. Information obtained could be used to gain an understanding of common software/applications running on systems within the network. Adversaries may use the information from Process Discovery during automated discovery to shape follow-on behaviors, including whether or not the adversary fully infects the target and/or attempts specific actions.
Tactics:	Discovery
Data Sources:	API monitoring, Process command-line parameters, Process monitoring
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

Description:	An adversary may attempt to get detailed information about the operating system and hardware, including version, patches, hotfixes, service packs, and architecture. Adversaries may use the information from System Information Discovery during automated discovery to shape follow-on behaviors, including whether or not the adversary fully infects the target and/or attempts specific actions.
Tactics:	Discovery
Data Sources:	AWS CloudTrail logs, Azure activity logs, Process command-line parameters, Process monitoring, Stackdriver logs
Platforms:	AWS, Azure, GCP, Linux, macOS, Windows
Url:	Open detailed description by Mitre

Description:	An adversary may compress and/or encrypt data that is collected prior to exfiltration. Compressing the data can help to obfuscate the collected data and minimize the amount of data sent over the network. Encryption can be used to hide information that is being exfiltrated from detection or make exfiltration less conspicuous upon inspection by a defender.
Tactics:	Collection
Data Sources:	Binary file metadata, File monitoring, Process command-line parameters, Process monitoring
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may employ a known encryption algorithm to conceal command and control traffic rather than relying on any inherent protections provided by a communication protocol. Despite the use of a secure algorithm, these implementations may be vulnerable to reverse engineering if secret keys are encoded and/or generated within malware samples/configuration files.
Tactics:	Command and Control
Data Sources:	Malware reverse engineering, Netflow/Enclave netflow, Packet capture, Process monitoring, Process use of network, SSL/TLS inspection
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may communicate using application layer protocols to avoid detection/network filtering by blending in with existing traffic. Commands to the remote system, and often the results of those commands, will be embedded within the protocol traffic between the client and server.
Tactics:	Command and Control
Data Sources:	DNS records, Netflow/Enclave netflow, Network protocol analysis, Packet capture, Process monitoring, Process use of network
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

Behavior Section

Behavior Chronological

Disassembly

Uncategorized

Graph

Loading ...

Warning!

Windows Analysis Report Justificante de Pago 25112021.pdf _.exe

Overview

General Information

Detection

Signatures

Classification

Process Tree

Malware Configuration

Threatname: GuLoader

Yara Overview

Memory Dumps

Sigma Overview

Jbx Signature Overview

AV Detection:

Compliance:

Networking:

System Summary:

Data Obfuscation:

Hooking and other Techniques for Hiding and Protection:

Malware Analysis System Evasion:

Anti Debugging:

HIPS / PFW / Operating System Protection Evasion:

Mitre Att&ck Matrix

Behavior Graph

Screenshots

Thumbnails

Antivirus, Machine Learning and Genetic Malware Detection

Initial Sample

Dropped Files

Unpacked PE Files

Domains

URLs

Domains and IPs

Contacted Domains

Contacted URLs

Contacted IPs

General Information

Simulations

Behavior and APIs

Joe Sandbox View / Context

IPs

Domains

ASN

JA3 Fingerprints

Dropped Files

Created / dropped Files

Static File Info

General

File Icon

Static PE Info

General

Authenticode Signature

Entrypoint Preview

Data Directories

Sections

Resources

Imports

Version Infos

Possible Origin

Network Behavior

Code Manipulations

Statistics

System Behavior

Analysis Process: Justificante de Pago 25112021.pdf _.exe PID: 6016 Parent PID: 5364

General

Disassembly

Code Analysis