pykspa | 65b601671c4c680e383f5e60fd19be09d33361d5ebdf78040e822a2999f0cf06

General

Target

JaffaCakes118_8c8b69b3acb146a63a585e4449073181.exe
Size

556KB
MD5

8c8b69b3acb146a63a585e4449073181
SHA1

ebc55228889193631dd99ec334ef75c3e5b6bd55
SHA256

65b601671c4c680e383f5e60fd19be09d33361d5ebdf78040e822a2999f0cf06
SHA512

cc50e9674e566e75d99cb63d70594d1e5b7b9ab969ba9b597215c71996349d60fd1c9a724084781fa11e5234982d412167a361a3d2509bcf0b993446d5e6358a
SSDEEP

6144:Ej6/wndfF/gl0LQIk8DR3dEuAI7pEfxsZozAm9TMdGQLUg1nYmefPImdrionr:O6onxOp8FySpE5zvIdtU+Ymef

Score

10^/10

pykspa defense_evasion discovery persistence trojan worm

Malware Config

Signatures

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

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

Detect Pykspa worm 1 IoCs

worm

resource	yara_rule
behavioral1/files/0x0007000000012118-2.dat	family_pykspa

Executes dropped EXE 1 IoCs

pid	Process
2308	yxvnauhxihf.exe

Loads dropped DLL 2 IoCs

pid	Process
2392	JaffaCakes118_8c8b69b3acb146a63a585e4449073181.exe
2392	JaffaCakes118_8c8b69b3acb146a63a585e4449073181.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"	yxvnauhxihf.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	yxvnauhxihf.exe

Drops file in System32 directory 7 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\ldalgusjxsrxcbvwqn.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\SysWOW64\wpnzvkjbqmmtzzuwrpa.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\SysWOW64\jdcpmccvlijryzvyutfz.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\SysWOW64\ytthfwxrigirzbyczzmhh.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\SysWOW64\plmbasuphgjtcfdighvrsh.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\SysWOW64\vlgpiuqfrkhloldc.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\SysWOW64\ctpztgdtgaydhfyyr.exe	yxvnauhxihf.exe

Drops file in Windows directory 7 IoCs

description	ioc	Process
File opened for modification	C:\Windows\vlgpiuqfrkhloldc.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\ctpztgdtgaydhfyyr.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\ldalgusjxsrxcbvwqn.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\wpnzvkjbqmmtzzuwrpa.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\jdcpmccvlijryzvyutfz.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\ytthfwxrigirzbyczzmhh.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\plmbasuphgjtcfdighvrsh.exe	yxvnauhxihf.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 1 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_8c8b69b3acb146a63a585e4449073181.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2392	JaffaCakes118_8c8b69b3acb146a63a585e4449073181.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2392 wrote to memory of 2308	2392	JaffaCakes118_8c8b69b3acb146a63a585e4449073181.exe	30
PID 2392 wrote to memory of 2308	2392	JaffaCakes118_8c8b69b3acb146a63a585e4449073181.exe	30
PID 2392 wrote to memory of 2308	2392	JaffaCakes118_8c8b69b3acb146a63a585e4449073181.exe	30
PID 2392 wrote to memory of 2308	2392	JaffaCakes118_8c8b69b3acb146a63a585e4449073181.exe	30

System policy modification 1 TTPs 2 IoCs

defense_evasion

Modify Registry

T1112

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

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_8c8b69b3acb146a63a585e4449073181.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_8c8b69b3acb146a63a585e4449073181.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2392
- C:\Users\Admin\AppData\Local\Temp\yxvnauhxihf.exe
  "C:\Users\Admin\AppData\Local\Temp\yxvnauhxihf.exe" "c:\users\admin\appdata\local\temp\jaffacakes118_8c8b69b3acb146a63a585e4449073181.exe*"
  2⤵
  - Modifies WinLogon for persistence
  - UAC bypass
  - Executes dropped EXE
  - Checks whether UAC is enabled
  - Drops file in System32 directory
  - Drops file in Windows directory
  - System policy modification
  PID:2308

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Winlogon Helper DLL

1

T1547.004

Privilege Escalation

Abuse Elevation Control Mechanism

1

T1548

Bypass User Account Control

1

T1548.002

Boot or Logon Autostart Execution

1

T1547

Winlogon Helper DLL

1

T1547.004

Defense Evasion

Abuse Elevation Control Mechanism

1

T1548

Bypass User Account Control

1

T1548.002

Impair Defenses

1

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\SysWOW64\ldalgusjxsrxcbvwqn.exe

Filesize
556KB

MD5
8c8b69b3acb146a63a585e4449073181

SHA1
ebc55228889193631dd99ec334ef75c3e5b6bd55

SHA256
65b601671c4c680e383f5e60fd19be09d33361d5ebdf78040e822a2999f0cf06

SHA512
cc50e9674e566e75d99cb63d70594d1e5b7b9ab969ba9b597215c71996349d60fd1c9a724084781fa11e5234982d412167a361a3d2509bcf0b993446d5e6358a

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\Users\Admin\AppData\Local\Temp\yxvnauhxihf.exe

Filesize
320KB

MD5
5203b6ea0901877fbf2d8d6f6d8d338e

SHA1
c803e92561921b38abe13239c1fd85605b570936

SHA256
0cc02d34d5fd4cf892fed282f98c1ad3e7dd6159a8877ae5c46d3f834ed36060

SHA512
d48a41b4fc4c38a6473f789c02918fb7353a4b4199768a3624f3b685d91d38519887a1ccd3616e0d2b079a346afaec5a0f2ef2c46d72d3097ef561cedb476471

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads