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
5	1756	powershell.exe
7	1756	powershell.exe
9	1756	powershell.exe

Downloads MZ/PE file 1 IoCs

flow	pid	Process
9	1756	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
5028	installer.exe
4748	installer.tmp
1880	TortoiseBlame.exe

Loads dropped DLL 6 IoCs

pid	Process
1880	TortoiseBlame.exe
1880	TortoiseBlame.exe
1880	TortoiseBlame.exe
1880	TortoiseBlame.exe
1880	TortoiseBlame.exe
1880	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-1-5-21-2023547815-1162023398-1465618254-1000\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
1880	TortoiseBlame.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
1756	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
behavioral1/files/0x00080000000244d1-63.dat	innosetup
behavioral1/memory/5028-70-0x0000000000120000-0x0000000000209000-memory.dmp	innosetup
behavioral1/memory/5028-177-0x0000000000120000-0x0000000000209000-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
1220	schtasks.exe

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
1756	powershell.exe
1756	powershell.exe
1756	powershell.exe
2184	powershell.exe
2184	powershell.exe
4748	installer.tmp
4748	installer.tmp

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1756	powershell.exe
Token: SeDebugPrivilege	2184	powershell.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
4748	installer.tmp

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 1756 wrote to memory of 2224	1756	powershell.exe	86
PID 2224 wrote to memory of 4968	2224	csc.exe	87
PID 1756 wrote to memory of 3732	1756	powershell.exe	88
PID 1756 wrote to memory of 1220	1756	powershell.exe	89
PID 1756 wrote to memory of 5028	1756	powershell.exe	93
PID 5028 wrote to memory of 4748	5028	installer.exe	94
PID 4748 wrote to memory of 1880	4748	installer.tmp	97

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
- Downloads MZ/PE file
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1756
- 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\pmojyorp\pmojyorp.cmdline"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2224
- - 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\RES211F.tmp" "c:\Users\Admin\AppData\Local\Temp\pmojyorp\CSC620BD874DCBB405EB15D55F834CFC8A4.TMP"
    3⤵
    PID:4968
- C:\Windows\system32\schtasks.exe
  "C:\Windows\system32\schtasks.exe" /Query /TN SVNBackgroundSync
  2⤵
  PID:3732
- 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:1220
- 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:5028
- - C:\Users\Admin\AppData\Local\Temp\is-EQI736486G.tmp\installer.tmp
    "C:\Users\Admin\AppData\Local\Temp\is-EQI736486G.tmp\installer.tmp" /SL5="$1201DE,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:4748
  - - 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:1880

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
powershell.exe
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2184

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