1a1610285101ab69816cb1308b9ac8cd48903cea72f25e839a53f9b09ec78050

General

Target
jaffacakes118_Trojan-Downloader.Win32.VB.ifkj.exe
Size 300KB
Sample261012-yb29fset5v
SHA256 1a1610285101ab69816cb1308b9ac8cd48903cea72f25e839a53f9b09ec78050
MD5 bfabe594adcc8a187e8f94ea251030e1
SHA1 26840ebdf4abad2edaa4953e9bcac0ac0a93bd3e
SHA512 5336631917a47791bb2eda15d3247a5f4d34e0c49e413b0f62d1a537d6534a4f66734665dd7fdc1e8e65e409a2c66a5a46b642c44f456ff059f7361b4f734b27
SSDEEP 6144:YKBQtgjfmLiwO9qNYgjfmLiwO9qNKc8BT4mCrW1CXwFk3P:3utgrN9qNYgrN9qNnoMLAPE
TLSH
T1E364AE3AFB648009F0D5007C681B1A5779685E386994193BFB826F4F39BA7E6B0F4313
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

adware defense_evasion discovery execution stealer trojan

Malware Config

Signatures

UAC bypass 3 TTPs 1 IoCs

defense_evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	reg.exe

Installs/modifies Browser Helper Object 2 TTPs 2 IoCs

BHOs are DLL modules which act as plugins for Internet Explorer.

stealer adware

Modify Registry

T1112

Browser Extensions

T1176

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\	jaffacakes118_Trojan-Downloader.Win32.VB.ifkj.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\	jaffacakes118_Trojan-Downloader.Win32.VB.ifkj.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\mjav392.dll	jaffacakes118_Trojan-Downloader.Win32.VB.ifkj.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\mjav4741.dll	jaffacakes118_Trojan-Downloader.Win32.VB.ifkj.exe

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
4008	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	jaffacakes118_Trojan-Downloader.Win32.VB.ifkj.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	jaffacakes118_Trojan-Downloader.Win32.VB.ifkj.exe

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	reg.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvr32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvr32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	jaffacakes118_Trojan-Downloader.Win32.VB.ifkj.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Modifies registry class 2 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Pkoy.clsPkoy\Clsid	jaffacakes118_Trojan-Downloader.Win32.VB.ifkj.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Pkoy.clsPkoy	jaffacakes118_Trojan-Downloader.Win32.VB.ifkj.exe

Modifies registry key 1 TTPs 1 IoCs

Modify Registry

T1112

pid	Process
1116	reg.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5896	jaffacakes118_Trojan-Downloader.Win32.VB.ifkj.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 5896 wrote to memory of 4008	5896	jaffacakes118_Trojan-Downloader.Win32.VB.ifkj.exe	90
PID 4008 wrote to memory of 1116	4008	cmd.exe	92
PID 5896 wrote to memory of 4868	5896	jaffacakes118_Trojan-Downloader.Win32.VB.ifkj.exe	93
PID 5896 wrote to memory of 5200	5896	jaffacakes118_Trojan-Downloader.Win32.VB.ifkj.exe	94

C:\Users\Admin\AppData\Local\Temp\jaffacakes118_Trojan-Downloader.Win32.VB.ifkj.exe
"C:\Users\Admin\AppData\Local\Temp\jaffacakes118_Trojan-Downloader.Win32.VB.ifkj.exe"
1⤵
- Installs/modifies Browser Helper Object
- Drops file in System32 directory
- Drops file in Windows directory
- Reads the TCP/IP host and domain name from the registry
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:5896
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\System32\cmd.exe /k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4008
- - C:\Windows\SysWOW64\reg.exe
    C:\Windows\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
    3⤵
    - UAC bypass
    - System Location Discovery: System Language Discovery
    - Modifies registry key
    PID:1116
- C:\Windows\SysWOW64\regsvr32.exe
  regsvr32.exe /s C:\Windows\system32\mjav392.dll
  2⤵
  - System Location Discovery: System Language Discovery
  PID:4868
- C:\Windows\SysWOW64\regsvr32.exe
  regsvr32.exe /s C:\Windows\mjav4741.dll
  2⤵
  - System Location Discovery: System Language Discovery
  PID:5200