xtremerat | 26d1ef36f48df366d3616fbecc3fa5e702a97ff2aa73aebbeb703880be63b8f5

Virtualization/Sandbox Evasion

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	JaffaCakes118_453d36819232cb50090b2848bd24e31d.exe

Boot or Logon Autostart Execution: Active Setup 2 TTPs 2 IoCs

Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

persistence

Active Setup

T1547.014

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Active Setup\Installed Components\{4WH4735F-E4LW-0X8H-8SVN-K3EE2070T60S}	svchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4WH4735F-E4LW-0X8H-8SVN-K3EE2070T60S}\StubPath = "C:\\Windows\\InstallDir\\Server.exe restart"	svchost.exe

Checks BIOS information in registry 2 TTPs 1 IoCs

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

Query Registry

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	JaffaCakes118_453d36819232cb50090b2848bd24e31d.exe

Identifies Wine through registry keys 2 TTPs 1 IoCs

Wine is a compatibility layer capable of running Windows applications, which can be used as sandboxing environment.

defense_evasion

Query Registry

Virtualization/Sandbox Evasion

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000\Software\Wine	JaffaCakes118_453d36819232cb50090b2848bd24e31d.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\HKLM = "C:\\Windows\\InstallDir\\Server.exe"	svchost.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\HKCU = "C:\\Windows\\InstallDir\\Server.exe"	svchost.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2256 set thread context of 4524	2256	JaffaCakes118_453d36819232cb50090b2848bd24e31d.exe	83

UPX packed file 9 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/4524-8-0x0000000010000000-0x000000001004D000-memory.dmp	upx
behavioral2/memory/4524-13-0x0000000010000000-0x000000001004D000-memory.dmp	upx
behavioral2/memory/4524-10-0x0000000010000000-0x000000001004D000-memory.dmp	upx
behavioral2/memory/2916-14-0x0000000010000000-0x000000001004D000-memory.dmp	upx
behavioral2/memory/692-15-0x0000000010000000-0x000000001004D000-memory.dmp	upx
behavioral2/memory/692-17-0x0000000010000000-0x000000001004D000-memory.dmp	upx
behavioral2/memory/692-18-0x0000000010000000-0x000000001004D000-memory.dmp	upx
behavioral2/memory/2916-19-0x0000000010000000-0x000000001004D000-memory.dmp	upx
behavioral2/memory/692-22-0x0000000010000000-0x000000001004D000-memory.dmp	upx

Drops file in Windows directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\InstallDir\Server.exe	svchost.exe
File created	C:\Windows\InstallDir\Server.exe	svchost.exe

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

System Information Discovery
T1082

Program crash 4 IoCs

pid	pid_target	Process	procid_target
2836	2916	WerFault.exe	84
1532	692	WerFault.exe	85
3752	2916	WerFault.exe	84
1584	692	WerFault.exe	85

System Location Discovery: System Language Discovery 1 TTPs 4 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	JaffaCakes118_453d36819232cb50090b2848bd24e31d.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_453d36819232cb50090b2848bd24e31d.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2256	JaffaCakes118_453d36819232cb50090b2848bd24e31d.exe
692	svchost.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 2256 wrote to memory of 4524	2256	JaffaCakes118_453d36819232cb50090b2848bd24e31d.exe	83
PID 2256 wrote to memory of 4524	2256	JaffaCakes118_453d36819232cb50090b2848bd24e31d.exe	83
PID 2256 wrote to memory of 4524	2256	JaffaCakes118_453d36819232cb50090b2848bd24e31d.exe	83
PID 2256 wrote to memory of 4524	2256	JaffaCakes118_453d36819232cb50090b2848bd24e31d.exe	83
PID 2256 wrote to memory of 4524	2256	JaffaCakes118_453d36819232cb50090b2848bd24e31d.exe	83
PID 2256 wrote to memory of 4524	2256	JaffaCakes118_453d36819232cb50090b2848bd24e31d.exe	83
PID 2256 wrote to memory of 4524	2256	JaffaCakes118_453d36819232cb50090b2848bd24e31d.exe	83
PID 2256 wrote to memory of 4524	2256	JaffaCakes118_453d36819232cb50090b2848bd24e31d.exe	83
PID 4524 wrote to memory of 2916	4524	JaffaCakes118_453d36819232cb50090b2848bd24e31d.exe	84
PID 4524 wrote to memory of 2916	4524	JaffaCakes118_453d36819232cb50090b2848bd24e31d.exe	84
PID 4524 wrote to memory of 2916	4524	JaffaCakes118_453d36819232cb50090b2848bd24e31d.exe	84
PID 4524 wrote to memory of 2916	4524	JaffaCakes118_453d36819232cb50090b2848bd24e31d.exe	84
PID 4524 wrote to memory of 692	4524	JaffaCakes118_453d36819232cb50090b2848bd24e31d.exe	85
PID 4524 wrote to memory of 692	4524	JaffaCakes118_453d36819232cb50090b2848bd24e31d.exe	85
PID 4524 wrote to memory of 692	4524	JaffaCakes118_453d36819232cb50090b2848bd24e31d.exe	85
PID 4524 wrote to memory of 692	4524	JaffaCakes118_453d36819232cb50090b2848bd24e31d.exe	85

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_453d36819232cb50090b2848bd24e31d.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_453d36819232cb50090b2848bd24e31d.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Identifies Wine through registry keys
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2256
- C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_453d36819232cb50090b2848bd24e31d.exe
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4524
- - C:\Windows\SysWOW64\svchost.exe
    svchost.exe
    3⤵
    - System Location Discovery: System Language Discovery
    PID:2916
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2916 -s 484
      4⤵
      Program crash
      PID:2836
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2916 -s 504
      4⤵
      Program crash
      PID:3752
- - C:\Windows\SysWOW64\svchost.exe
    svchost.exe
    3⤵
    - Boot or Logon Autostart Execution: Active Setup
    - Adds Run key to start application
    - Drops file in Windows directory
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    PID:692
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 692 -s 972
      4⤵
      Program crash
      PID:1532
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 692 -s 980
      4⤵
      Program crash
      PID:1584

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 2916 -ip 2916
1⤵
PID:1140

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 692 -ip 692
1⤵
PID:3252

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 540 -p 2916 -ip 2916
1⤵
PID:1132

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 692 -ip 692
1⤵
PID:1788

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Active Setup

T1547.014

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Active Setup

T1547.014

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Virtualization/Sandbox Evasion

Credential Access

Discovery

Query Registry

3

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Virtualization/Sandbox Evasion