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Analysis Report coreupdater.exe

Overview

General Information

Sample Name:	coreupdater.exe
Analysis ID:	398583
MD5:	eed41b4500e473f97c50c7385ef5e374
SHA1:	fd153c66386ca93ec9993d66a84d6f0d129a3a5c
SHA256:	10f3b92002bb98467334161cf85d0b1730851f9256f83c27db125e9a0c1cfda6
Infos:
Most interesting Screenshot:

Detection

Metasploit

Score:	68
Range:	0 - 100
Whitelisted:	false
Confidence:	100%

Signatures

Antivirus / Scanner detection for submitted sample

Multi AV Scanner detection for submitted file

Yara detected Metasploit Payload

Machine Learning detection for sample

Antivirus or Machine Learning detection for unpacked file

Entry point lies outside standard sections

IP address seen in connection with other malware

PE file contains an invalid checksum

PE file contains sections with non-standard names

Program does not show much activity (idle)

Classification

Startup

System is w10x64

coreupdater.exe (PID: 6948 cmdline: 'C:\Users\user\Desktop\coreupdater.exe' MD5: EED41B4500E473F97C50C7385EF5E374)

cleanup

Malware Configuration

No configs have been found

Yara Overview

Initial Sample

Source	Rule	Description	Author	Strings
coreupdater.exe	JoeSecurity_MetasploitPayload_2	Yara detected Metasploit Payload	Joe Security

Sigma Overview

No Sigma rule has matched

Signature Overview

Click to jump to signature section

Show All Signature Results

AV Detection:

Antivirus / Scanner detection for submitted sample

Show sources

Source: coreupdater.exe

Avira: detected

Multi AV Scanner detection for submitted file

Show sources

Source: coreupdater.exe	Virustotal: Detection: 68%			Perma Link
Source: coreupdater.exe	ReversingLabs: Detection: 86%

Machine Learning detection for sample

Show sources

Source: coreupdater.exe

Joe Sandbox ML: detected

Source: 0.2.coreupdater.exe.140000000.0.unpack	Avira: Label: TR/Crypt.XPACK.Gen7
Source: 0.0.coreupdater.exe.140000000.0.unpack	Avira: Label: TR/Crypt.XPACK.Gen7

Source: Joe Sandbox View

IP Address: 203.78.103.109 203.78.103.109

Source: unknown	TCP traffic detected without corresponding DNS query: 203.78.103.109
Source: unknown	TCP traffic detected without corresponding DNS query: 203.78.103.109
Source: unknown	TCP traffic detected without corresponding DNS query: 203.78.103.109
Source: unknown	TCP traffic detected without corresponding DNS query: 203.78.103.109

Source: C:\Users\user\Desktop\coreupdater.exe

Code function: 0_2_00000001400040FD LoadLibraryA,WSAStartup,WSASocketA,connect,recv,closesocket,

0_2_00000001400040FD

Source: unknown	Network traffic detected: HTTP traffic on port 49726 -> 443
Source: unknown	Network traffic detected: HTTP traffic on port 49769 -> 443
Source: unknown	Network traffic detected: HTTP traffic on port 443 -> 49726
Source: unknown	Network traffic detected: HTTP traffic on port 443 -> 49769

Source: classification engine

Classification label: mal68.troj.winEXE@1/0@0/1

Source: C:\Users\user\Desktop\coreupdater.exe

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

Jump to behavior

Source: coreupdater.exe	Virustotal: Detection: 68%
Source: coreupdater.exe	ReversingLabs: Detection: 86%

Source: coreupdater.exe

Static PE information: Image base 0x140000000 > 0x60000000

Source: initial sample

Static PE information: section where entry point is pointing to: .lhru

Source: coreupdater.exe

Static PE information: real checksum: 0x8596 should be: 0x874e

Source: coreupdater.exe

Static PE information: section name: .lhru

Source: all processes

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

Source: coreupdater.exe, 00000000.00000002.902871142.000000000049B000.00000004.00000020.sdmp

Binary or memory string: Hyper-V RAW%SystemRoot%\system32\mswsock.dll

Source: all processes

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

Remote Access Functionality:

Yara detected Metasploit Payload

Show sources

Source: Yara match

File source: coreupdater.exe, type: SAMPLE

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	Path Interception	Software Packing1	OS Credential Dumping	Security Software Discovery1	Remote Services	Data from Local System	Exfiltration Over Other Network Medium	Encrypted Channel2	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	Rootkit	LSASS Memory	System Information Discovery1	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 Information	Security Account Manager	Query Registry	SMB/Windows Admin Shares	Data from Network Shared Drive	Automated Exfiltration	Ingress Tool Transfer1	Exploit SS7 to Track Device Location	Obtain Device Cloud Backups	Delete Device Data

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
coreupdater.exe	69%	Virustotal		Browse
coreupdater.exe	86%	ReversingLabs	Win64.Backdoor.Meterpreter
coreupdater.exe	100%	Avira	TR/Crypt.XPACK.Gen7
coreupdater.exe	100%	Joe Sandbox ML

Dropped Files

No Antivirus matches

Unpacked PE Files

Source	Detection	Scanner	Label	Link	Download
0.2.coreupdater.exe.140000000.0.unpack	100%	Avira	TR/Crypt.XPACK.Gen7		Download File
0.0.coreupdater.exe.140000000.0.unpack	100%	Avira	TR/Crypt.XPACK.Gen7		Download File

Domains

No Antivirus matches

URLs

No Antivirus matches

Domains and IPs

Contacted Domains

No contacted domains info

Contacted IPs

No. of IPs < 25%
25% < No. of IPs < 50%
50% < No. of IPs < 75%
75% < No. of IPs

Public

IP	Domain	Country	Flag	ASN	ASN Name	Malicious
203.78.103.109	unknown	Thailand		18362	NETWAY-AS-APNetwayCommunicationCoLtdTH	false

General Information

Joe Sandbox Version:	31.0.0 Emerald
Analysis ID:	398583
Start date:	27.04.2021
Start time:	18:11:31
Joe Sandbox Product:	CloudBasic
Overall analysis duration:	0h 4m 10s
Hypervisor based Inspection enabled:	false
Report type:	full
Sample file name:	coreupdater.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:	17
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:	mal68.troj.winEXE@1/0@0/1
EGA Information:	Successful, ratio: 100%
HDC Information:	Successful, ratio: 100% (good quality ratio 50%) Quality average: 25.5% Quality standard deviation: 25.5%
HCA Information:	Failed
Cookbook Comments:	Adjust boot time Enable AMSI Found application associated with file extension: .exe
Warnings:	Show All Exclude process from analysis (whitelisted): BackgroundTransferHost.exe, backgroundTaskHost.exe, svchost.exe, wuapihost.exe

Simulations

Behavior and APIs

No simulations

Joe Sandbox View / Context

IPs

Match	Associated Sample Name / URL	SHA 256	Detection	Link
203.78.103.109	coreupdater.exe	Get hash	malicious	Browse
	coreupdater.exe	Get hash	malicious	Browse
	coreupdater.exe	Get hash	malicious	Browse
	coreupdater.exe	Get hash	malicious	Browse
	coreupdater.exe	Get hash	malicious	Browse
	coreupdater.exe	Get hash	malicious	Browse

Domains

No context

ASN

Match	Associated Sample Name / URL	SHA 256	Detection	Link	Context
NETWAY-AS-APNetwayCommunicationCoLtdTH	coreupdater.exe	Get hash	malicious	Browse	203.78.103.109
	coreupdater.exe	Get hash	malicious	Browse	203.78.103.109
	coreupdater.exe	Get hash	malicious	Browse	203.78.103.109
	coreupdater.exe	Get hash	malicious	Browse	203.78.103.109
	coreupdater.exe	Get hash	malicious	Browse	203.78.103.109
	coreupdater.exe	Get hash	malicious	Browse	203.78.103.109
	coreupdater.exe	Get hash	malicious	Browse	203.78.103.109
	qevRktR4diBlxL7.exe	Get hash	malicious	Browse	203.78.104.33
	PO72920.exe	Get hash	malicious	Browse	203.78.107.126

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) x86-64, for MS Windows
Entropy (8bit):	1.5023004512656497
TrID:	Win64 Executable GUI (202006/5) 92.65% Win64 Executable (generic) (12005/4) 5.51% Generic Win/DOS Executable (2004/3) 0.92% DOS Executable Generic (2002/1) 0.92% Autodesk FLIC Image File (extensions: flc, fli, cel) (7/3) 0.00%
File name:	coreupdater.exe
File size:	7168
MD5:	eed41b4500e473f97c50c7385ef5e374
SHA1:	fd153c66386ca93ec9993d66a84d6f0d129a3a5c
SHA256:	10f3b92002bb98467334161cf85d0b1730851f9256f83c27db125e9a0c1cfda6
SHA512:	b8f9a4e0de32cb2ab17c84091ccc61a16197ac5726513b7214a28af83c7a04326836c3980db426905b783daddf8951bcd60864aa3c088d0d98a63544825251da
SSDEEP:	24:eFGStrJ9u0/6ZAGnZd0BQAVs2Pb85n8acX3bTJBm2uJ65OxCLYk9fpmB:is0je0BQx2Pbqn8LHCJ65+CR9sB
File Content Preview:	MZ......................@...............................................!..L.!This program cannot be run in DOS mode....$.......9$..}E..}E..}E..Z...~E..}E~..E..t=..\|E..t=..\|E..Rich}E..................PE..d...}<.K..........#......0...........@.........@...

File Icon


Icon Hash:	00828e8e8686b000

Static PE Info

General
Entrypoint:	0x140004000
Entrypoint Section:	.lhru
Digitally signed:	false
Imagebase:	0x140000000
Subsystem:	windows gui
Image File Characteristics:	EXECUTABLE_IMAGE, LARGE_ADDRESS_AWARE, RELOCS_STRIPPED
DLL Characteristics:	TERMINAL_SERVER_AWARE
Time Stamp:	0x4BC63C7D [Wed Apr 14 22:06:53 2010 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:	b4c6fff030479aa3b12625be67bf4914

Entrypoint Preview

Instruction
dec eax
xor ecx, ecx
dec eax
sub ecx, FFFFFFC0h
dec eax
lea eax, dword ptr [FFFFFFEFh]
dec eax
mov ebx, 63771DFAh
xchg eax, ebp
push ds
ror dword ptr [eax+31h], 1
pop eax
daa
dec eax
sub eax, FFFFFFF8h
loop 00007F5E90A93156h
push es
push ebp
hlt
xchg esi, eax
jnl 00007F5E90A93134h
sar edx, 1
sbb eax, C5773236h
dec esp
sub byte ptr [ebp+edx*2-22AC4EBAh], FFFFFF95h
sbb dword ptr [edx+2E31FC55h], FFFFFFDDh
xchg eax, ebp
sbb edx, 55h
cld
adc dword ptr [esi-23h], esp
adc dword ptr [esi-50h], esp
push edi
cmp dl, byte ptr [edx-01h]

Rich Headers

Programming Language:

[IMP] VS2005 build 50727
[LNK] VS2008 SP1 build 30729
[ASM] VS2008 SP1 build 30729

Data Directories

Name	Virtual Address	Virtual Size	Is in Section
IMAGE_DIRECTORY_ENTRY_EXPORT	0x0	0x0
IMAGE_DIRECTORY_ENTRY_IMPORT	0x4228	0x6c	.lhru
IMAGE_DIRECTORY_ENTRY_RESOURCE	0x0	0x0
IMAGE_DIRECTORY_ENTRY_EXCEPTION	0x0	0x0
IMAGE_DIRECTORY_ENTRY_SECURITY	0x0	0x0
IMAGE_DIRECTORY_ENTRY_BASERELOC	0x4298	0x8	.lhru
IMAGE_DIRECTORY_ENTRY_DEBUG	0x0	0x0
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	0x0	0x0
IMAGE_DIRECTORY_ENTRY_IAT	0x3000	0x18	.rdata
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	0x104e	0x1200	False	0.025390625	data	0.168100494025	IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_READ
.rdata	0x3000	0x84	0x200	False	0.15625	data	0.963086734599	IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_READ
.lhru	0x4000	0x2a0	0x400	False	0.630859375	data	5.27184729098	IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_MEM_WRITE, IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_READ

Imports

DLL	Import
KERNEL32.dll	VirtualAlloc, ExitProcess

Network Behavior

Network Port Distribution

TCP Packets

Timestamp	Source Port	Dest Port	Source IP	Dest IP
Apr 27, 2021 18:12:14.702913046 CEST	49726	443	192.168.2.4	203.78.103.109
Apr 27, 2021 18:12:15.132515907 CEST	443	49726	203.78.103.109	192.168.2.4
Apr 27, 2021 18:12:15.132766962 CEST	49726	443	192.168.2.4	203.78.103.109
Apr 27, 2021 18:14:12.642050028 CEST	443	49726	203.78.103.109	192.168.2.4
Apr 27, 2021 18:14:12.643842936 CEST	49769	443	192.168.2.4	203.78.103.109
Apr 27, 2021 18:14:12.973098993 CEST	443	49769	203.78.103.109	192.168.2.4
Apr 27, 2021 18:14:12.973440886 CEST	49769	443	192.168.2.4	203.78.103.109

Code Manipulations

Statistics

CPU Usage

Click to jump to process

Memory Usage

Click to jump to process

High Level Behavior Distribution

Click to dive into process behavior distribution

System Behavior

Analysis Process: coreupdater.exe PID: 6948 Parent PID: 5864

General

Start time:	18:12:14
Start date:	27/04/2021
Path:	C:\Users\user\Desktop\coreupdater.exe
Wow64 process (32bit):	false
Commandline:	'C:\Users\user\Desktop\coreupdater.exe'
Imagebase:	0x140000000
File size:	7168 bytes
MD5 hash:	EED41B4500E473F97C50C7385EF5E374
Has elevated privileges:	true
Has administrator privileges:	true
Programmed in:	C, C++ or other language
Reputation:	low

Chronological Activities

Disassembly

Code Analysis

Reset < >

Analysis Process: coreupdater.exe PID: 6948 Parent PID: 5864 coreupdater.exeCOMMON

Execution Graph

Execution Coverage:	45.1%
Dynamic/Decrypted Code Coverage:	0%
Signature Coverage:	77.8%
Total number of Nodes:	9
Total number of Limit Nodes:	2

Callgraph

Executed
Not Executed
Opacity -> Relevance
Disassembly available

Executed Functions

Function 00000001400040FD, Relevance: 14.1, APIs: 6, Strings: 2, Instructions: 92
networklibraryCOMMON

Download Yara Rule

Control-flow Graph

Executed
Not Executed

APIs

LoadLibraryA.KERNELBASE ref: 000000014000412F
WSAStartup.WS2_32 ref: 0000000140004140
WSASocketA.WS2_32(00000000,00000000), ref: 0000000140004160
connect.WS2_32 ref: 0000000140004175
recv.WS2_32 ref: 000000014000419C
closesocket.WS2_32 ref: 0000000140004200

Strings

ws2_32, xrefs: 00000001400040FE
unMa, xrefs: 00000001400041FA

Memory Dump Source

Source File: 00000000.00000002.903003152.0000000140004000.00000040.00020000.sdmp, Offset: 0000000140000000, based on PE: true

Associated: 00000000.00000002.902993994.0000000140000000.00000002.00020000.sdmp Download File

Joe Sandbox IDA Plugin

Snapshot File: hcaresult_0_2_140000000_coreupdater.jbxd

Similarity

API ID: LibraryLoadSocketStartupclosesocketconnectrecv
String ID: unMa$ws2_32
API String ID: 3143952708-2325342229
Opcode ID: e0bc243e3ece973aafce17a10db08446549acb4de04a9cf65ddec8ad0dde3452
Instruction ID: 0eb5a51088fb32553ad0377e79a2f18065261e7ce6dd6a858750634258cf552b
Opcode Fuzzy Hash: e0bc243e3ece973aafce17a10db08446549acb4de04a9cf65ddec8ad0dde3452
Instruction Fuzzy Hash: 0E2108E275515828F927A2A33D57FF544456B29FE0F5840207F1E4F7D6DC68C6C2411D

Uniqueness

Uniqueness Score: -1.00%

Non-executed Functions

Description:	Adversaries may perform software packing or virtual machine software protection to conceal their code. Software packing is a method of compressing or encrypting an executable. Packing an executable changes the file signature in an attempt to avoid signature-based detection. Most decompression techniques decompress the executable code in memory. Virtual machine software protection translates an executable's original code into a special format that only a special virtual machine can run. A virtual machine is then called to run this code.
Tactics:	Defense Evasion
Data Sources:	Binary file metadata
Platforms:	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:	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:	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

Description:	Adversaries may transfer tools or other files from an external system into a compromised environment. Files may be copied from an external adversary controlled system through the command and control channel to bring tools into the victim network or through alternate protocols with another tool such as FTP. Files can also be copied over on Mac and Linux with native tools like scp, rsync, and sftp.
Tactics:	Command and Control
Data Sources:	File monitoring, Netflow/Enclave netflow, Network protocol analysis, Packet capture, Process command-line parameters, Process monitoring, Process use of network
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

Behavior Section

Behavior Chronological

Disassembly

Uncategorized

Graph

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Warning!

Analysis Report coreupdater.exe

Overview

General Information

Detection

Signatures

Classification

Startup

Malware Configuration

Yara Overview

Initial Sample

Sigma Overview

Signature Overview

AV Detection:

Networking:

System Summary:

Data Obfuscation:

Malware Analysis System Evasion:

Anti Debugging:

Remote Access Functionality:

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 IPs

Public

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

Entrypoint Preview

Rich Headers

Data Directories

Sections

Imports

Network Behavior

Network Port Distribution

TCP Packets

Code Manipulations

Statistics

CPU Usage

Memory Usage

High Level Behavior Distribution

back

System Behavior

Analysis Process: coreupdater.exe PID: 6948 Parent PID: 5864

General

Chronological Activities

Disassembly

Code Analysis

Analysis Process: coreupdater.exe PID: 6948 Parent PID: 5864 coreupdater.exeCOMMON

Execution Graph

Graph

Callgraph

Executed Functions

Function 00000001400040FD, Relevance: 14.1, APIs: 6, Strings: 2, Instructions: 92
networklibraryCOMMON