pykspa | 1b1f772b3fba3cc0537b5346915ffbe9668a239a310d9d37e2d938e604cc4adf

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "Explorer.exe"	cnrfakasmxb.exe

Pykspa
Pykspa is a worm spreads via Skype uses DGA and it's written in C++.
worm pykspa
Pykspa family
pykspa

UAC bypass 3 TTPs 3 IoCs

defense_evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

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

Detect Pykspa worm 4 IoCs

worm

resource	yara_rule
behavioral1/files/0x000c00000001202c-2.dat	family_pykspa
behavioral1/files/0x0005000000019c50-61.dat	family_pykspa
behavioral1/files/0x0005000000019c50-65.dat	family_pykspa
behavioral1/files/0x0005000000019c50-76.dat	family_pykspa

Adds policy Run key to start application 2 TTPs 3 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	cnrfakasmxb.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\kfqbpzhqcppb = "vztnkdumhdmhvtyssujnh.exe"	cnrfakasmxb.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\zrzhszekt = "C:\\Users\\Admin\\AppData\\Local\\Temp\\vztnkdumhdmhvtyssujnh.exe"	cnrfakasmxb.exe

Disables RegEdit via registry modification 2 IoCs

defense_evasion

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-2039016743-699959520-214465309-1000\Software\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	cnrfakasmxb.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	cnrfakasmxb.exe

Executes dropped EXE 1 IoCs

pid	Process
1876	cnrfakasmxb.exe

Loads dropped DLL 2 IoCs

pid	Process
1592	JaffaCakes118_90ac8e58b702c30eb1b23a50795b14c5.exe
1592	JaffaCakes118_90ac8e58b702c30eb1b23a50795b14c5.exe

Adds Run key to start application 2 TTPs 8 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2039016743-699959520-214465309-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\nhrboxemxji = "C:\\Users\\Admin\\AppData\\Local\\Temp\\tvnfargwpjqjvrumkkx.exe ."	cnrfakasmxb.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\sludpxdkuf = "srgvnbnaqhlbkdds.exe"	cnrfakasmxb.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce\nhrboxemxji = "ijarlbpewpvnytvmji.exe ."	cnrfakasmxb.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2039016743-699959520-214465309-1000\Software\Microsoft\Windows\CurrentVersion\Run\jfrdsdmwjxylr = "ijarlbpewpvnytvmji.exe"	cnrfakasmxb.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2039016743-699959520-214465309-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\khuhxjteshjxev = "srgvnbnaqhlbkdds.exe ."	cnrfakasmxb.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\srgvnbnaqhlbkdds = "C:\\Users\\Admin\\AppData\\Local\\Temp\\srgvnbnaqhlbkdds.exe"	cnrfakasmxb.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce\nlznercodtwltlk = "C:\\Users\\Admin\\AppData\\Local\\Temp\\vztnkdumhdmhvtyssujnh.exe ."	cnrfakasmxb.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2039016743-699959520-214465309-1000\Software\Microsoft\Windows\CurrentVersion\Run\sludpxdkuf = "C:\\Users\\Admin\\AppData\\Local\\Temp\\gjcvrjzqkfnhurvonocf.exe"	cnrfakasmxb.exe

Checks whether UAC is enabled 1 TTPs 2 IoCs

defense_evasion trojan

System Information Discovery

T1082

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

Drops file in System32 directory 7 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\tvnfargwpjqjvrumkkx.exe	cnrfakasmxb.exe
File opened for modification	C:\Windows\SysWOW64\gjcvrjzqkfnhurvonocf.exe	cnrfakasmxb.exe
File opened for modification	C:\Windows\SysWOW64\vztnkdumhdmhvtyssujnh.exe	cnrfakasmxb.exe
File opened for modification	C:\Windows\SysWOW64\mrmhfzrkgdnjyxdyzcsxsn.exe	cnrfakasmxb.exe
File opened for modification	C:\Windows\SysWOW64\srgvnbnaqhlbkdds.exe	cnrfakasmxb.exe
File opened for modification	C:\Windows\SysWOW64\zzpfynaofxctdxyok.exe	cnrfakasmxb.exe
File opened for modification	C:\Windows\SysWOW64\ijarlbpewpvnytvmji.exe	cnrfakasmxb.exe

Drops file in Windows directory 7 IoCs

description	ioc	Process
File opened for modification	C:\Windows\vztnkdumhdmhvtyssujnh.exe	cnrfakasmxb.exe
File opened for modification	C:\Windows\mrmhfzrkgdnjyxdyzcsxsn.exe	cnrfakasmxb.exe
File opened for modification	C:\Windows\srgvnbnaqhlbkdds.exe	cnrfakasmxb.exe
File opened for modification	C:\Windows\zzpfynaofxctdxyok.exe	cnrfakasmxb.exe
File opened for modification	C:\Windows\ijarlbpewpvnytvmji.exe	cnrfakasmxb.exe
File opened for modification	C:\Windows\tvnfargwpjqjvrumkkx.exe	cnrfakasmxb.exe
File opened for modification	C:\Windows\gjcvrjzqkfnhurvonocf.exe	cnrfakasmxb.exe

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 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	JaffaCakes118_90ac8e58b702c30eb1b23a50795b14c5.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cnrfakasmxb.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
1592	JaffaCakes118_90ac8e58b702c30eb1b23a50795b14c5.exe
1592	JaffaCakes118_90ac8e58b702c30eb1b23a50795b14c5.exe
1592	JaffaCakes118_90ac8e58b702c30eb1b23a50795b14c5.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1592 wrote to memory of 1876	1592	JaffaCakes118_90ac8e58b702c30eb1b23a50795b14c5.exe	30
PID 1592 wrote to memory of 1876	1592	JaffaCakes118_90ac8e58b702c30eb1b23a50795b14c5.exe	30
PID 1592 wrote to memory of 1876	1592	JaffaCakes118_90ac8e58b702c30eb1b23a50795b14c5.exe	30
PID 1592 wrote to memory of 1876	1592	JaffaCakes118_90ac8e58b702c30eb1b23a50795b14c5.exe	30

System policy modification 1 TTPs 5 IoCs

defense_evasion

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System	cnrfakasmxb.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	cnrfakasmxb.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	cnrfakasmxb.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	cnrfakasmxb.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorUser = "0"	cnrfakasmxb.exe

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_90ac8e58b702c30eb1b23a50795b14c5.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_90ac8e58b702c30eb1b23a50795b14c5.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1592
- C:\Users\Admin\AppData\Local\Temp\cnrfakasmxb.exe
  "C:\Users\Admin\AppData\Local\Temp\cnrfakasmxb.exe" "c:\users\admin\appdata\local\temp\jaffacakes118_90ac8e58b702c30eb1b23a50795b14c5.exe*"
  2⤵
  - Modifies WinLogon for persistence
  - UAC bypass
  - Adds policy Run key to start application
  - Disables RegEdit via registry modification
  - Executes dropped EXE
  - Adds Run key to start application
  - Checks whether UAC is enabled
  - Drops file in System32 directory
  - Drops file in Windows directory
  - System Location Discovery: System Language Discovery
  - System policy modification
  PID:1876
- - C:\Users\Admin\AppData\Local\Temp\tjpvejm.exe
    "C:\Users\Admin\AppData\Local\Temp\tjpvejm.exe" "-C:\Users\Admin\AppData\Local\Temp\srgvnbnaqhlbkdds.exe"
    3⤵
    PID:2848
- - C:\Users\Admin\AppData\Local\Temp\tjpvejm.exe
    "C:\Users\Admin\AppData\Local\Temp\tjpvejm.exe" "-C:\Users\Admin\AppData\Local\Temp\srgvnbnaqhlbkdds.exe"
    3⤵
    PID:2700

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

3

T1547

Registry Run Keys / Startup Folder

2

Winlogon Helper DLL

T1547.004

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Boot or Logon Autostart Execution

3

T1547

Registry Run Keys / Startup Folder

2

Winlogon Helper DLL

T1547.004

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

System Information Discovery

2

T1082

System Location Discovery

T1614

System Language Discovery