602d6da9c868e03a403ab4df6704d42cc94d8b960fb5fd38575be1a5d2da327c

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	a3fc86696512a68337f2f98fb7d4dbb5.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	a3fc86696512a68337f2f98fb7d4dbb5.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	a3fc86696512a68337f2f98fb7d4dbb5.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000\Control Panel\International\Geo\Nation	a3fc86696512a68337f2f98fb7d4dbb5.exe

Drops startup file 1 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\PowerExpertNNT.lnk	a3fc86696512a68337f2f98fb7d4dbb5.exe

Executes dropped EXE 2 IoCs

pid	Process
2548	a3fc86696512a68337f2f98fb7d4dbb5.exe
4748	a3fc86696512a68337f2f98fb7d4dbb5.exe

Themida packer 10 IoCs

Detects Themida, an advanced Windows software protection system.

themida

resource	yara_rule
behavioral2/memory/4656-0-0x0000000000170000-0x0000000000DEE000-memory.dmp	themida
behavioral2/memory/4656-8-0x0000000000170000-0x0000000000DEE000-memory.dmp	themida
behavioral2/memory/4656-9-0x0000000000170000-0x0000000000DEE000-memory.dmp	themida
behavioral2/memory/4656-10-0x0000000000170000-0x0000000000DEE000-memory.dmp	themida
behavioral2/memory/4656-11-0x0000000000170000-0x0000000000DEE000-memory.dmp	themida
behavioral2/memory/4656-12-0x0000000000170000-0x0000000000DEE000-memory.dmp	themida
behavioral2/memory/4656-13-0x0000000000170000-0x0000000000DEE000-memory.dmp	themida
behavioral2/files/0x000700000002348f-19.dat	themida
behavioral2/memory/4656-20-0x0000000000170000-0x0000000000DEE000-memory.dmp	themida
behavioral2/memory/4656-41-0x0000000000170000-0x0000000000DEE000-memory.dmp	themida

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-1-5-21-656926755-4116854191-210765258-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ExtreamFanV6 = "C:\\Users\\Admin\\AppData\\Local\\ExtreamFanV6\\ExtreamFanV6.exe"	a3fc86696512a68337f2f98fb7d4dbb5.exe

Checks whether UAC is enabled 1 TTPs 1 IoCs

evasion trojan

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	a3fc86696512a68337f2f98fb7d4dbb5.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
4656	a3fc86696512a68337f2f98fb7d4dbb5.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2548 set thread context of 4748	2548	a3fc86696512a68337f2f98fb7d4dbb5.exe	101

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 5 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	a3fc86696512a68337f2f98fb7d4dbb5.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	a3fc86696512a68337f2f98fb7d4dbb5.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	a3fc86696512a68337f2f98fb7d4dbb5.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

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

persistence execution

Scheduled Task

pid	Process
2232	schtasks.exe
1888	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4656	a3fc86696512a68337f2f98fb7d4dbb5.exe
4656	a3fc86696512a68337f2f98fb7d4dbb5.exe

Suspicious behavior: RenamesItself 1 IoCs

pid	Process
4656	a3fc86696512a68337f2f98fb7d4dbb5.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2548	a3fc86696512a68337f2f98fb7d4dbb5.exe

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 4656 wrote to memory of 2232	4656	a3fc86696512a68337f2f98fb7d4dbb5.exe	89
PID 4656 wrote to memory of 2232	4656	a3fc86696512a68337f2f98fb7d4dbb5.exe	89
PID 4656 wrote to memory of 2232	4656	a3fc86696512a68337f2f98fb7d4dbb5.exe	89
PID 4656 wrote to memory of 1888	4656	a3fc86696512a68337f2f98fb7d4dbb5.exe	91
PID 4656 wrote to memory of 1888	4656	a3fc86696512a68337f2f98fb7d4dbb5.exe	91
PID 4656 wrote to memory of 1888	4656	a3fc86696512a68337f2f98fb7d4dbb5.exe	91
PID 4656 wrote to memory of 2548	4656	a3fc86696512a68337f2f98fb7d4dbb5.exe	99
PID 4656 wrote to memory of 2548	4656	a3fc86696512a68337f2f98fb7d4dbb5.exe	99
PID 4656 wrote to memory of 2548	4656	a3fc86696512a68337f2f98fb7d4dbb5.exe	99
PID 2548 wrote to memory of 4748	2548	a3fc86696512a68337f2f98fb7d4dbb5.exe	101
PID 2548 wrote to memory of 4748	2548	a3fc86696512a68337f2f98fb7d4dbb5.exe	101
PID 2548 wrote to memory of 4748	2548	a3fc86696512a68337f2f98fb7d4dbb5.exe	101
PID 2548 wrote to memory of 4748	2548	a3fc86696512a68337f2f98fb7d4dbb5.exe	101
PID 2548 wrote to memory of 4748	2548	a3fc86696512a68337f2f98fb7d4dbb5.exe	101
PID 2548 wrote to memory of 4748	2548	a3fc86696512a68337f2f98fb7d4dbb5.exe	101
PID 2548 wrote to memory of 4748	2548	a3fc86696512a68337f2f98fb7d4dbb5.exe	101
PID 2548 wrote to memory of 4748	2548	a3fc86696512a68337f2f98fb7d4dbb5.exe	101
PID 2548 wrote to memory of 4748	2548	a3fc86696512a68337f2f98fb7d4dbb5.exe	101
PID 2548 wrote to memory of 4748	2548	a3fc86696512a68337f2f98fb7d4dbb5.exe	101

C:\Users\Admin\AppData\Local\Temp\a3fc86696512a68337f2f98fb7d4dbb5.exe
"C:\Users\Admin\AppData\Local\Temp\a3fc86696512a68337f2f98fb7d4dbb5.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Checks computer location settings
- Drops startup file
- Adds Run key to start application
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: RenamesItself
- Suspicious use of WriteProcessMemory
PID:4656
- C:\Windows\SysWOW64\schtasks.exe
  schtasks /create /f /RU "Admin" /tr "C:\ProgramData\jewkkwnf\jewkkwnf.exe" /tn "jewkkwnf HR" /sc HOURLY /rl HIGHEST
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:2232
- C:\Windows\SysWOW64\schtasks.exe
  schtasks /create /f /RU "Admin" /tr "C:\ProgramData\jewkkwnf\jewkkwnf.exe" /tn "jewkkwnf LG" /sc ONLOGON /rl HIGHEST
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:1888
- C:\Users\Admin\AppData\Local\Temp\a3fc86696512a68337f2f98fb7d4dbb5.exe
  "C:\Users\Admin\AppData\Local\Temp\a3fc86696512a68337f2f98fb7d4dbb5.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2548
- - C:\Users\Admin\AppData\Local\Temp\a3fc86696512a68337f2f98fb7d4dbb5.exe
    "C:\Users\Admin\AppData\Local\Temp\a3fc86696512a68337f2f98fb7d4dbb5.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:4748

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

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