c03eed16fc03200c480b0c86a170a1f77a32fab582ff8571b7efbb63df8d9611

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	TortoiseBlame.exe

Badlisted process makes network request 3 IoCs

Network request originating from process or tool commonly abused by malware.

flow	pid	Process
1	4884	PowerShell.exe
3	4884	PowerShell.exe
4	4884	PowerShell.exe

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	TortoiseBlame.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	TortoiseBlame.exe

Executes dropped EXE 3 IoCs

pid	Process
4600	installer.exe
4292	installer.tmp
672	TortoiseBlame.exe

Loads dropped DLL 7 IoCs

pid	Process
672	TortoiseBlame.exe
672	TortoiseBlame.exe
672	TortoiseBlame.exe
672	TortoiseBlame.exe
672	TortoiseBlame.exe
672	TortoiseBlame.exe
672	TortoiseBlame.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2122505878-652277452-2375749442-1000\Software\Microsoft\Windows\CurrentVersion\Run\TortoiseSVN = "\"C:\\Users\\Admin\\AppData\\Roaming\\SVN-Tools2\\TortoiseBlame.exe\""	installer.tmp

Checks whether UAC is enabled 1 TTPs 1 IoCs

defense_evasion trojan

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	TortoiseBlame.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
672	TortoiseBlame.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
4884	PowerShell.exe

System Location Discovery: System Language Discovery 1 TTPs 2 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	installer.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	installer.tmp

Inno Setup is an open-source installation builder for Windows applications. 3 IoCs

Inno Setup installer

installer

resource	yara_rule
behavioral2/files/0x001a00000002b4fe-60.dat	innosetup
behavioral2/memory/4600-66-0x00000000009D0000-0x0000000000AB9000-memory.dmp	innosetup
behavioral2/memory/4600-179-0x00000000009D0000-0x0000000000AB9000-memory.dmp	innosetup

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

System Information Discovery

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	TortoiseBlame.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	TortoiseBlame.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

pid	Process
1732	schtasks.exe

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
4884	PowerShell.exe
4884	PowerShell.exe
4884	PowerShell.exe
3864	powershell.exe
3864	powershell.exe
4292	installer.tmp
4292	installer.tmp

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4884	PowerShell.exe
Token: SeDebugPrivilege	3864	powershell.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
4292	installer.tmp

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 4884 wrote to memory of 3744	4884	PowerShell.exe	81
PID 3744 wrote to memory of 3372	3744	csc.exe	82
PID 4884 wrote to memory of 1044	4884	PowerShell.exe	83
PID 4884 wrote to memory of 1732	4884	PowerShell.exe	84
PID 4884 wrote to memory of 4600	4884	PowerShell.exe	87
PID 4600 wrote to memory of 4292	4600	installer.exe	88
PID 4292 wrote to memory of 672	4292	installer.tmp	89

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Windows\system32\WindowsPowerShell\v1.0\PowerShell.exe
powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\_c03eed16fc03200c480b0c86a170a1f77a32fab582ff8571b7efbb63df8d9611.ps1
1⤵
- Badlisted process makes network request
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4884
- C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe
  "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\he051flf\he051flf.cmdline"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3744
- - C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe
    C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RES4179.tmp" "c:\Users\Admin\AppData\Local\Temp\he051flf\CSC284507F210BF4C7B86D57012C345FFEE.TMP"
    3⤵
    PID:3372
- C:\Windows\system32\schtasks.exe
  "C:\Windows\system32\schtasks.exe" /Query /TN SVNBackgroundSync
  2⤵
  PID:1044
- C:\Windows\system32\schtasks.exe
  "C:\Windows\system32\schtasks.exe" /Create /TN SVNBackgroundSync /TR "powershell.exe -WindowStyle Hidden -NoLogo -NoProfile -NonInteractive -ExecutionPolicy Bypass -File "C:\Users\Admin\AppData\Roaming\SVN-Tools\svn_helper.ps1"" /SC MINUTE /MO 60 /F
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1732
- C:\Users\Admin\AppData\Roaming\SVN-Tools\installer.exe
  "C:\Users\Admin\AppData\Roaming\SVN-Tools\installer.exe" /VERYSILENT /SUPPRESSMSGBOXES /NORESTART /SP- /DIR="C:\Users\Admin\AppData\Roaming\SVN-Tools2"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4600
- - C:\Users\Admin\AppData\Local\Temp\is-YSUQCCMKIF.tmp\installer.tmp
    "C:\Users\Admin\AppData\Local\Temp\is-YSUQCCMKIF.tmp\installer.tmp" /SL5="$9017E,28912943,893952,C:\Users\Admin\AppData\Roaming\SVN-Tools\installer.exe" /VERYSILENT /SUPPRESSMSGBOXES /NORESTART /SP- /DIR="C:\Users\Admin\AppData\Roaming\SVN-Tools2"
    3⤵
    - Executes dropped EXE
    - Adds Run key to start application
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of FindShellTrayWindow
    - Suspicious use of WriteProcessMemory
    PID:4292
  - - C:\Users\Admin\AppData\Roaming\SVN-Tools2\TortoiseBlame.exe
      "C:\Users\Admin\AppData\Roaming\SVN-Tools2\TortoiseBlame.exe"
      4⤵
      Identifies VirtualBox via ACPI registry values (likely anti-VM)
      Checks BIOS information in registry
      Executes dropped EXE
      Loads dropped DLL
      Checks whether UAC is enabled
      Suspicious use of NtSetInformationThreadHideFromDebugger
      Checks processor information in registry
      PID:672

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
powershell.exe
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3864

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Scheduled Task

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

Defense Evasion

Modify Registry

T1112

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Query Registry

System Information Discovery