pykspa | a6afc8a42ff96ee7f475419b54cf84f7ac1296c7cfbea713ab6886fb5a387e29

General

Target

JaffaCakes118_89d19bf090f579e04d66ee3035fe64dd.exe
Size

564KB
MD5

89d19bf090f579e04d66ee3035fe64dd
SHA1

ad6c6785bf77d71ddd40a55f01e1b219aebd06d3
SHA256

a6afc8a42ff96ee7f475419b54cf84f7ac1296c7cfbea713ab6886fb5a387e29
SHA512

b1b6b3b5ebd7afeffc51280b25a42cd1b87c06cedfa012bd3e58eea4a0703eed1f1dde3506374265ac7df4bd1856d5fc0d72fafcfd5694d123b23bed108f462a
SSDEEP

12288:4pUJ3r6YkVwJgNnSykgb9cqWnw4q6ZmFhqsD:4pUNr6YkVRFkgbeqeo68Fhqy

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"	izfuneuesjp.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"	izfuneuesjp.exe

Detect Pykspa worm 1 IoCs

worm

resource	yara_rule
behavioral1/files/0x000d0000000133b8-2.dat	family_pykspa

Executes dropped EXE 1 IoCs

pid	Process
2904	izfuneuesjp.exe

Loads dropped DLL 2 IoCs

pid	Process
3056	JaffaCakes118_89d19bf090f579e04d66ee3035fe64dd.exe
3056	JaffaCakes118_89d19bf090f579e04d66ee3035fe64dd.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"	izfuneuesjp.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	izfuneuesjp.exe

Drops file in System32 directory 7 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\bjyrhyshuirnysqm.exe	izfuneuesjp.exe
File opened for modification	C:\Windows\SysWOW64\irhbskfvjyifrmlie.exe	izfuneuesjp.exe
File opened for modification	C:\Windows\SysWOW64\rbsnfyulaqbzmiigdu.exe	izfuneuesjp.exe
File opened for modification	C:\Windows\SysWOW64\cnfbuoldtkwvjghgewg.exe	izfuneuesjp.exe
File opened for modification	C:\Windows\SysWOW64\pburlgexogttigiihalx.exe	izfuneuesjp.exe
File opened for modification	C:\Windows\SysWOW64\erljeaztlestjilmmgsfz.exe	izfuneuesjp.exe
File opened for modification	C:\Windows\SysWOW64\vjedzwwrketvmmqstobpkj.exe	izfuneuesjp.exe

Drops file in Windows directory 7 IoCs

description	ioc	Process
File opened for modification	C:\Windows\vjedzwwrketvmmqstobpkj.exe	izfuneuesjp.exe
File opened for modification	C:\Windows\bjyrhyshuirnysqm.exe	izfuneuesjp.exe
File opened for modification	C:\Windows\irhbskfvjyifrmlie.exe	izfuneuesjp.exe
File opened for modification	C:\Windows\rbsnfyulaqbzmiigdu.exe	izfuneuesjp.exe
File opened for modification	C:\Windows\cnfbuoldtkwvjghgewg.exe	izfuneuesjp.exe
File opened for modification	C:\Windows\pburlgexogttigiihalx.exe	izfuneuesjp.exe
File opened for modification	C:\Windows\erljeaztlestjilmmgsfz.exe	izfuneuesjp.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_89d19bf090f579e04d66ee3035fe64dd.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3056	JaffaCakes118_89d19bf090f579e04d66ee3035fe64dd.exe
3056	JaffaCakes118_89d19bf090f579e04d66ee3035fe64dd.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3056 wrote to memory of 2904	3056	JaffaCakes118_89d19bf090f579e04d66ee3035fe64dd.exe	30
PID 3056 wrote to memory of 2904	3056	JaffaCakes118_89d19bf090f579e04d66ee3035fe64dd.exe	30
PID 3056 wrote to memory of 2904	3056	JaffaCakes118_89d19bf090f579e04d66ee3035fe64dd.exe	30
PID 3056 wrote to memory of 2904	3056	JaffaCakes118_89d19bf090f579e04d66ee3035fe64dd.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	izfuneuesjp.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	izfuneuesjp.exe

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_89d19bf090f579e04d66ee3035fe64dd.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_89d19bf090f579e04d66ee3035fe64dd.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:3056
- C:\Users\Admin\AppData\Local\Temp\izfuneuesjp.exe
  "C:\Users\Admin\AppData\Local\Temp\izfuneuesjp.exe" "c:\users\admin\appdata\local\temp\jaffacakes118_89d19bf090f579e04d66ee3035fe64dd.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:2904

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\rbsnfyulaqbzmiigdu.exe

Filesize
564KB

MD5
89d19bf090f579e04d66ee3035fe64dd

SHA1
ad6c6785bf77d71ddd40a55f01e1b219aebd06d3

SHA256
a6afc8a42ff96ee7f475419b54cf84f7ac1296c7cfbea713ab6886fb5a387e29

SHA512
b1b6b3b5ebd7afeffc51280b25a42cd1b87c06cedfa012bd3e58eea4a0703eed1f1dde3506374265ac7df4bd1856d5fc0d72fafcfd5694d123b23bed108f462a

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

Filesize
320KB

MD5
977bc0393d37a6e56c095554e321f5df

SHA1
b8727d084dece8e01781140b278dc8d7e862f326

SHA256
053887c4e84cbc82b26257b32c692f7d91c7e824bf81f36be3db4df4beaa339e

SHA512
70b18e6debacc196731f513ff604621158a06cfe76b97968c09d2464e405904abb7b80e2478dde10c1d00c43ec07f3f56aa67cece594e88b7d8f3e3a974bc49e

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads