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Analysis Report STER.SCR

Overview

General Information

Sample Name:STER.SCR (renamed file extension from SCR to exe)
Analysis ID:278423
MD5:2fb3e52939e8189e387dadfd3a01d845
SHA1:6c6bf013b8b3dd0002d24f9590081cf4fe2ddfce
SHA256:6a9a159154eb384f56b453c29c18e30eb60b8fbb391c79e342ae8c0eafe1afb3

Most interesting Screenshot:

Detection

GuLoader
Score:80
Range:0 - 100
Whitelisted:false
Confidence:100%

Signatures

Antivirus / Scanner detection for submitted sample
Multi AV Scanner detection for submitted file
Potential malicious icon found
Yara detected GuLoader
Tries to detect virtualization through RDTSC time measurements
Yara detected VB6 Downloader Generic
Abnormal high CPU Usage
Antivirus or Machine Learning detection for unpacked file
Contains functionality for execution timing, often used to detect debuggers
Contains functionality to query CPU information (cpuid)
Contains functionality to read the PEB
Creates a DirectInput object (often for capturing keystrokes)
PE file contains strange resources
Sample file is different than original file name gathered from version info
Uses code obfuscation techniques (call, push, ret)

Classification

Startup

  • System is w10x64
  • STER.exe (PID: 6768 cmdline: 'C:\Users\user\Desktop\STER.exe' MD5: 2FB3E52939E8189E387DADFD3A01D845)
  • cleanup

Malware Configuration

No configs have been found

Yara Overview

Memory Dumps

SourceRuleDescriptionAuthorStrings
Process Memory Space: STER.exe PID: 6768JoeSecurity_VB6DownloaderGenericYara detected VB6 Downloader GenericJoe Security
    Process Memory Space: STER.exe PID: 6768JoeSecurity_GuLoaderYara detected GuLoaderJoe Security

      Sigma Overview

      No Sigma rule has matched

      Signature Overview

      Click to jump to signature section

      Show All Signature Results

      AV Detection:

      barindex
      Antivirus / Scanner detection for submitted sampleShow sources
      Source: STER.exeAvira: detected
      Multi AV Scanner detection for submitted fileShow sources
      Source: STER.exeVirustotal: Detection: 27%Perma Link
      Source: STER.exeMetadefender: Detection: 28%Perma Link
      Source: STER.exeReversingLabs: Detection: 55%
      Source: 1.0.STER.exe.400000.0.unpackAvira: Label: TR/Injector.lygkl
      Source: STER.exe, 00000001.00000002.470837910.0000000000668000.00000004.00000020.sdmpBinary or memory string: <HOOK MODULE="DDRAW.DLL" FUNCTION="DirectDrawCreateEx"/>

      System Summary:

      barindex
      Potential malicious icon foundShow sources
      Source: initial sampleIcon embedded in PE file: bad icon match: 20047c7c70f0e004
      Source: C:\Users\user\Desktop\STER.exeProcess Stats: CPU usage > 98%
      Source: STER.exeStatic PE information: Resource name: RT_ICON type: GLS_BINARY_LSB_FIRST
      Source: STER.exe, 00000001.00000002.471375599.0000000002080000.00000002.00000001.sdmpBinary or memory string: OriginalFilenameuser32j% vs STER.exe
      Source: classification engineClassification label: mal80.rans.troj.evad.winEXE@1/0@0/0
      Source: STER.exeStatic PE information: Section: .text IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_READ
      Source: C:\Users\user\Desktop\STER.exeSection loaded: C:\Windows\SysWOW64\msvbvm60.dllJump to behavior
      Source: C:\Users\user\Desktop\STER.exeKey opened: HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\Safer\CodeIdentifiersJump to behavior
      Source: STER.exeVirustotal: Detection: 27%
      Source: STER.exeMetadefender: Detection: 28%
      Source: STER.exeReversingLabs: Detection: 55%

      Data Obfuscation:

      barindex
      Yara detected GuLoaderShow sources
      Source: Yara matchFile source: Process Memory Space: STER.exe PID: 6768, type: MEMORY
      Yara detected VB6 Downloader GenericShow sources
      Source: Yara matchFile source: Process Memory Space: STER.exe PID: 6768, type: MEMORY
      Source: C:\Users\user\Desktop\STER.exeCode function: 1_2_00401328 push ecx; retf 1_2_00401352
      Source: C:\Users\user\Desktop\STER.exeCode function: 1_2_00403043 push edx; iretd 1_2_00403044
      Source: C:\Users\user\Desktop\STER.exeCode function: 1_2_00402E14 push ecx; retf 1_2_00402E34
      Source: C:\Users\user\Desktop\STER.exeCode function: 1_2_004058C4 push ss; ret 1_2_004058C5
      Source: C:\Users\user\Desktop\STER.exeCode function: 1_2_004040EA push ebp; ret 1_2_004040F8
      Source: C:\Users\user\Desktop\STER.exeCode function: 1_2_0040348F push eax; iretd 1_2_00403490
      Source: C:\Users\user\Desktop\STER.exeCode function: 1_2_00405C9F push edx; iretd 1_2_00405CA0
      Source: C:\Users\user\Desktop\STER.exeCode function: 1_2_004058BB push eax; iretd 1_2_004058BC
      Source: C:\Users\user\Desktop\STER.exeCode function: 1_2_00403ABC push edx; iretd 1_2_00403B08
      Source: C:\Users\user\Desktop\STER.exeCode function: 1_2_004044BD push eax; iretd 1_2_004044E0
      Source: C:\Users\user\Desktop\STER.exeCode function: 1_2_00404D6D push 509D051Ah; iretd 1_2_00404D80
      Source: C:\Users\user\Desktop\STER.exeCode function: 1_2_00403500 pushad ; ret 1_2_00403501
      Source: C:\Users\user\Desktop\STER.exeCode function: 1_2_00402DC2 push ecx; retf 1_2_00402E34
      Source: C:\Users\user\Desktop\STER.exeCode function: 1_2_020E18A1 push esi; iretd 1_2_020E18A2
      Source: C:\Users\user\Desktop\STER.exeCode function: 1_2_020E1BE3 push 0FFEE217h; iretd 1_2_020E1BE8
      Source: C:\Users\user\Desktop\STER.exeProcess information set: NOOPENFILEERRORBOXJump to behavior
      Source: C:\Users\user\Desktop\STER.exeProcess information set: NOOPENFILEERRORBOXJump to behavior
      Source: C:\Users\user\Desktop\STER.exeProcess information set: NOOPENFILEERRORBOXJump to behavior
      Source: C:\Users\user\Desktop\STER.exeProcess information set: NOOPENFILEERRORBOXJump to behavior
      Source: C:\Users\user\Desktop\STER.exeProcess information set: NOOPENFILEERRORBOXJump to behavior

      Malware Analysis System Evasion:

      barindex
      Tries to detect virtualization through RDTSC time measurementsShow sources
      Source: C:\Users\user\Desktop\STER.exeRDTSC instruction interceptor: First address: 00000000020E2771 second address: 00000000020E2771 instructions: 0x00000000 rdtsc 0x00000002 mov eax, 00000001h 0x00000007 cpuid 0x00000009 popad 0x0000000a call 00007F1641045FF8h 0x0000000f lfence 0x00000012 mov edx, dword ptr [7FFE0014h] 0x00000018 lfence 0x0000001b ret 0x0000001c sub edx, esi 0x0000001e ret 0x0000001f cmp cl, dl 0x00000021 pop ecx 0x00000022 add edi, edx 0x00000024 dec ecx 0x00000025 cmp ecx, 00000000h 0x00000028 jne 00007F1641045FE1h 0x0000002a push ecx 0x0000002b call 00007F1641046015h 0x00000030 call 00007F164104600Ah 0x00000035 lfence 0x00000038 mov edx, dword ptr [7FFE0014h] 0x0000003e lfence 0x00000041 ret 0x00000042 mov esi, edx 0x00000044 pushad 0x00000045 rdtsc
      Source: C:\Users\user\Desktop\STER.exeCode function: 1_2_020E2408 rdtsc 1_2_020E2408
      Source: STER.exeBinary or memory string: C:\Program Files\Qemu-ga\qemu-ga.exe
      Source: C:\Users\user\Desktop\STER.exeCode function: 1_2_020E2408 rdtsc 1_2_020E2408
      Source: C:\Users\user\Desktop\STER.exeCode function: 1_2_020E261D mov eax, dword ptr fs:[00000030h]1_2_020E261D
      Source: C:\Users\user\Desktop\STER.exeCode function: 1_2_020E0E99 mov eax, dword ptr fs:[00000030h]1_2_020E0E99
      Source: C:\Users\user\Desktop\STER.exeCode function: 1_2_020E14AE mov eax, dword ptr fs:[00000030h]1_2_020E14AE
      Source: C:\Users\user\Desktop\STER.exeCode function: 1_2_020E0AA5 mov eax, dword ptr fs:[00000030h]1_2_020E0AA5
      Source: C:\Users\user\Desktop\STER.exeCode function: 1_2_020E234D mov eax, dword ptr fs:[00000030h]1_2_020E234D
      Source: C:\Users\user\Desktop\STER.exeCode function: 1_2_020E29EA mov eax, dword ptr fs:[00000030h]1_2_020E29EA
      Source: C:\Users\user\Desktop\STER.exeCode function: 1_2_020E29EB mov eax, dword ptr fs:[00000030h]1_2_020E29EB
      Source: STER.exe, 00000001.00000002.471010446.0000000000C30000.00000002.00000001.sdmpBinary or memory string: Shell_TrayWnd
      Source: STER.exe, 00000001.00000002.471010446.0000000000C30000.00000002.00000001.sdmpBinary or memory string: NProgram Manager
      Source: STER.exe, 00000001.00000002.471010446.0000000000C30000.00000002.00000001.sdmpBinary or memory string: Progman
      Source: STER.exe, 00000001.00000002.471010446.0000000000C30000.00000002.00000001.sdmpBinary or memory string: Progmanlock
      Source: C:\Users\user\Desktop\STER.exeCode function: 1_2_020E2698 cpuid 1_2_020E2698

      Mitre Att&ck Matrix

      Initial AccessExecutionPersistencePrivilege EscalationDefense EvasionCredential AccessDiscoveryLateral MovementCollectionExfiltrationCommand and ControlNetwork EffectsRemote Service EffectsImpact
      Valid AccountsWindows Management InstrumentationPath InterceptionProcess Injection1Software Packing1Input Capture1Security Software Discovery111Remote ServicesInput Capture1Exfiltration Over Other Network MediumData ObfuscationEavesdrop on Insecure Network CommunicationRemotely Track Device Without AuthorizationModify System Partition
      Default AccountsScheduled Task/JobBoot or Logon Initialization ScriptsBoot or Logon Initialization ScriptsProcess Injection1LSASS MemoryProcess Discovery1Remote Desktop ProtocolData from Removable MediaExfiltration Over BluetoothJunk DataExploit SS7 to Redirect Phone Calls/SMSRemotely Wipe Data Without AuthorizationDevice Lockout
      Domain AccountsAt (Linux)Logon Script (Windows)Logon Script (Windows)Obfuscated Files or Information1Security Account ManagerSystem Information Discovery111SMB/Windows Admin SharesData from Network Shared DriveAutomated ExfiltrationSteganographyExploit SS7 to Track Device LocationObtain Device Cloud BackupsDelete 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.