pykspa | fee5238781445c4ab42965493f89ed336d233e263a2f8e48e18d41cb429c26ac

General

Target

JaffaCakes118_8b35c3401f106b86f1ef0d5b0dda2138.exe
Size

500KB
MD5

8b35c3401f106b86f1ef0d5b0dda2138
SHA1

ffc1d2f3894800772a5d9c312c12d47a3f42c57e
SHA256

fee5238781445c4ab42965493f89ed336d233e263a2f8e48e18d41cb429c26ac
SHA512

f957791dbfe0c12a78a4b8c02f6fda43b47849d485d3919230f711a9ea0e2a3c9fe67debf8ffbe24bc7ab91706695110778448e1429f4fdf1f8500935359605a
SSDEEP

12288:2g5pBHxXptbN5ZRgOiBjw/C0AWzFjdTkkXBD:jH7tbrbIBjwuWR1kkxD

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
2000	yxvnauhxihf.exe

Loads dropped DLL 2 IoCs

pid	Process
2384	JaffaCakes118_8b35c3401f106b86f1ef0d5b0dda2138.exe
2384	JaffaCakes118_8b35c3401f106b86f1ef0d5b0dda2138.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\momifbrrgdjtcfdighsuso.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\SysWOW64\sogwndnhqhhloldc.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\SysWOW64\zwpgypavfxydhfyyr.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\SysWOW64\igasldplwprxcbvwqn.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\SysWOW64\tsngatgdpjmtzzuwrpx.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\SysWOW64\ggcwrlzxkfjryzvyutcc.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\SysWOW64\vwtokfuthdirzbyczzjkh.exe	yxvnauhxihf.exe

Drops file in Windows directory 7 IoCs

description	ioc	Process
File opened for modification	C:\Windows\igasldplwprxcbvwqn.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\tsngatgdpjmtzzuwrpx.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\ggcwrlzxkfjryzvyutcc.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\vwtokfuthdirzbyczzjkh.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\momifbrrgdjtcfdighsuso.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\sogwndnhqhhloldc.exe	yxvnauhxihf.exe
File opened for modification	C:\Windows\zwpgypavfxydhfyyr.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_8b35c3401f106b86f1ef0d5b0dda2138.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2384	JaffaCakes118_8b35c3401f106b86f1ef0d5b0dda2138.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2384 wrote to memory of 2000	2384	JaffaCakes118_8b35c3401f106b86f1ef0d5b0dda2138.exe	30
PID 2384 wrote to memory of 2000	2384	JaffaCakes118_8b35c3401f106b86f1ef0d5b0dda2138.exe	30
PID 2384 wrote to memory of 2000	2384	JaffaCakes118_8b35c3401f106b86f1ef0d5b0dda2138.exe	30
PID 2384 wrote to memory of 2000	2384	JaffaCakes118_8b35c3401f106b86f1ef0d5b0dda2138.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_8b35c3401f106b86f1ef0d5b0dda2138.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_8b35c3401f106b86f1ef0d5b0dda2138.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2384
- C:\Users\Admin\AppData\Local\Temp\yxvnauhxihf.exe
  "C:\Users\Admin\AppData\Local\Temp\yxvnauhxihf.exe" "c:\users\admin\appdata\local\temp\jaffacakes118_8b35c3401f106b86f1ef0d5b0dda2138.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:2000

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\igasldplwprxcbvwqn.exe

Filesize
500KB

MD5
8b35c3401f106b86f1ef0d5b0dda2138

SHA1
ffc1d2f3894800772a5d9c312c12d47a3f42c57e

SHA256
fee5238781445c4ab42965493f89ed336d233e263a2f8e48e18d41cb429c26ac

SHA512
f957791dbfe0c12a78a4b8c02f6fda43b47849d485d3919230f711a9ea0e2a3c9fe67debf8ffbe24bc7ab91706695110778448e1429f4fdf1f8500935359605a

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

Filesize
320KB

MD5
eb09c682903ecbd87f30b0366e008d8f

SHA1
59b0dc27c06ce536327490439a37751a3dbd5e38

SHA256
c4b122f7bab30363b472a3dffb8a7c61604c0ec4719ebd233ccbac8be0951be1

SHA512
83236c0955b81375666c10445d2cf5e4723b24e42e4ee5fb951f53945483be2fff5c8ef167f08cfad3accc162c61e750bb1039edbf09e26afe18cba2f994eb5d

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads