pykspa | 43052236052cd013b93a57abd4dac9fc4a5cdaa0eb0a23f2c5d48e105fd12071

General

Target

JaffaCakes118_8f7640d6457aa4b9577933e5f8d6810d.exe
Size

808KB
MD5

8f7640d6457aa4b9577933e5f8d6810d
SHA1

919ef19ff62248866a040fba3267b36f718c1077
SHA256

43052236052cd013b93a57abd4dac9fc4a5cdaa0eb0a23f2c5d48e105fd12071
SHA512

04a2128b9e6549ac6b74cdb8b0b66785958103b9fccdfaa3eace7754ddba5d153bbb50b75ccec373f92b0593673a9580737777976c671240d7f2ac222a24e3d6
SSDEEP

12288:2Kr3QboC9qLGKgZKe4HYpHvcbTMZy3gPbEB/:2Q3QbiGL8LwHq

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/0x000b000000012263-2.dat	family_pykspa

Executes dropped EXE 1 IoCs

pid	Process
576	yxvnauhxihf.exe

Loads dropped DLL 2 IoCs

pid	Process
2388	JaffaCakes118_8f7640d6457aa4b9577933e5f8d6810d.exe
2388	JaffaCakes118_8f7640d6457aa4b9577933e5f8d6810d.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\rqmffzrljdjtcfdighxwsl.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\SysWOW64\xqgtnbnbthhloldc.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\SysWOW64\eypdynapixydhfyyr.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\SysWOW64\niaplbpfzprxcbvwqn.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\SysWOW64\yundargxsjmtzzuwrpc.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\SysWOW64\lictrjzrnfjryzvyuthe.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\SysWOW64\aytlkdunkdirzbyczzomh.exe	yxvnauhxihf.exe

Drops file in Windows directory 7 IoCs

description	ioc	Process
File opened for modification	C:\Windows\lictrjzrnfjryzvyuthe.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\aytlkdunkdirzbyczzomh.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\rqmffzrljdjtcfdighxwsl.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\xqgtnbnbthhloldc.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\eypdynapixydhfyyr.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\niaplbpfzprxcbvwqn.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\yundargxsjmtzzuwrpc.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_8f7640d6457aa4b9577933e5f8d6810d.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2388	JaffaCakes118_8f7640d6457aa4b9577933e5f8d6810d.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2388 wrote to memory of 576	2388	JaffaCakes118_8f7640d6457aa4b9577933e5f8d6810d.exe	31
PID 2388 wrote to memory of 576	2388	JaffaCakes118_8f7640d6457aa4b9577933e5f8d6810d.exe	31
PID 2388 wrote to memory of 576	2388	JaffaCakes118_8f7640d6457aa4b9577933e5f8d6810d.exe	31
PID 2388 wrote to memory of 576	2388	JaffaCakes118_8f7640d6457aa4b9577933e5f8d6810d.exe	31

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_8f7640d6457aa4b9577933e5f8d6810d.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_8f7640d6457aa4b9577933e5f8d6810d.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2388
- C:\Users\Admin\AppData\Local\Temp\yxvnauhxihf.exe
  "C:\Users\Admin\AppData\Local\Temp\yxvnauhxihf.exe" "c:\users\admin\appdata\local\temp\jaffacakes118_8f7640d6457aa4b9577933e5f8d6810d.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:576

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\niaplbpfzprxcbvwqn.exe

Filesize
808KB

MD5
8f7640d6457aa4b9577933e5f8d6810d

SHA1
919ef19ff62248866a040fba3267b36f718c1077

SHA256
43052236052cd013b93a57abd4dac9fc4a5cdaa0eb0a23f2c5d48e105fd12071

SHA512
04a2128b9e6549ac6b74cdb8b0b66785958103b9fccdfaa3eace7754ddba5d153bbb50b75ccec373f92b0593673a9580737777976c671240d7f2ac222a24e3d6

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

Filesize
320KB

MD5
d89ff4c429564280d37631fad31aa582

SHA1
6088405f10a156be3e821fd24c2ab821d8f32fdd

SHA256
c4d1e9ff1ded946b6660ae6b476bebf7e7c01eeb5dc8bad56ca1f4d8f252980e

SHA512
eb6c0e3c17c1575801855bca30e0ec2e693cbe5f91ce5834253005eff5fccfc647d7fbb8df52a9b701b50f11c0c0e4c9e75d8fa8387739fcbe96be5eaa2942c6

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads