eb590c9f6e69bc427a43db0ac150f95fb13c13ab718d5b392ff2cc92820441f2

Analysis

max time kernel
148s
max time network
157s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
05/12/2022, 06:07

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General

Target

eb590c9f6e69bc427a43db0ac150f95fb13c13ab718d5b392ff2cc92820441f2.exe
Size

258KB
MD5

0fea74f0a3678ccf16643642beebca20
SHA1

fa769c0f95a3eb845e7ad27d0c30b3df35ebbb27
SHA256

eb590c9f6e69bc427a43db0ac150f95fb13c13ab718d5b392ff2cc92820441f2
SHA512

be729b0ea20d0ce8a9e7856fbc4ff9c6f19332ecdfcb92ff97984b20c6de5908eba9cf0772233be60e129c127c94235ae1b6b01807ce2f4ad0dce2f3038d1cad
SSDEEP

6144:mQ7ZxwGr6dYgE85WuIeJ8nS3BwgGTTBuj7ON:mKetYH851Ie8nOagGTTE+N

Score

8^/10

persistence

Malware Config

Signatures

Executes dropped EXE 1 IoCs

pid	Process
4936	SysCheck.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SysCheck = "C:\\Windows\\system32\\SysCheck.exe"	SysCheck.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SysCheck = "C:\\Windows\\system32\\SysCheck.exe"	SysCheck.exe

Drops file in System32 directory 4 IoCs

description	ioc	Process
File created	C:\Windows\system32\SysCheck.dll	SysCheck.exe
File opened for modification	C:\Windows\system32\SysCheck.exe	eb590c9f6e69bc427a43db0ac150f95fb13c13ab718d5b392ff2cc92820441f2.exe
File created	C:\Windows\system32\SysCheck.exe	eb590c9f6e69bc427a43db0ac150f95fb13c13ab718d5b392ff2cc92820441f2.exe
File opened for modification	C:\Windows\system32\SysCheck.dll	SysCheck.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Modifies registry class 5 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\dllfile\shell\open\command	eb590c9f6e69bc427a43db0ac150f95fb13c13ab718d5b392ff2cc92820441f2.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\dllfile	eb590c9f6e69bc427a43db0ac150f95fb13c13ab718d5b392ff2cc92820441f2.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\dllfile\shell	eb590c9f6e69bc427a43db0ac150f95fb13c13ab718d5b392ff2cc92820441f2.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\dllfile\shell\open	eb590c9f6e69bc427a43db0ac150f95fb13c13ab718d5b392ff2cc92820441f2.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\dllfile\shell\open\command\ = "rundll32.exe"	eb590c9f6e69bc427a43db0ac150f95fb13c13ab718d5b392ff2cc92820441f2.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	880	eb590c9f6e69bc427a43db0ac150f95fb13c13ab718d5b392ff2cc92820441f2.exe
Token: SeDebugPrivilege	4936	SysCheck.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
880	eb590c9f6e69bc427a43db0ac150f95fb13c13ab718d5b392ff2cc92820441f2.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 880 wrote to memory of 4936	880	eb590c9f6e69bc427a43db0ac150f95fb13c13ab718d5b392ff2cc92820441f2.exe	80
PID 880 wrote to memory of 4936	880	eb590c9f6e69bc427a43db0ac150f95fb13c13ab718d5b392ff2cc92820441f2.exe	80
PID 880 wrote to memory of 4936	880	eb590c9f6e69bc427a43db0ac150f95fb13c13ab718d5b392ff2cc92820441f2.exe	80
PID 880 wrote to memory of 2596	880	eb590c9f6e69bc427a43db0ac150f95fb13c13ab718d5b392ff2cc92820441f2.exe	65
PID 880 wrote to memory of 2596	880	eb590c9f6e69bc427a43db0ac150f95fb13c13ab718d5b392ff2cc92820441f2.exe	65

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:2596
- C:\Users\Admin\AppData\Local\Temp\eb590c9f6e69bc427a43db0ac150f95fb13c13ab718d5b392ff2cc92820441f2.exe
  "C:\Users\Admin\AppData\Local\Temp\eb590c9f6e69bc427a43db0ac150f95fb13c13ab718d5b392ff2cc92820441f2.exe"
  2⤵
  - Drops file in System32 directory
  - Modifies registry class
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of WriteProcessMemory
  PID:880
- - C:\Windows\system32\SysCheck.exe
    C:\Windows\system32\SysCheck.exe
    3⤵
    - Executes dropped EXE
    - Adds Run key to start application
    - Drops file in System32 directory
    - Suspicious use of AdjustPrivilegeToken
    PID:4936

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\System32\SysCheck.exe

Filesize
258KB

MD5
0fea74f0a3678ccf16643642beebca20

SHA1
fa769c0f95a3eb845e7ad27d0c30b3df35ebbb27

SHA256
eb590c9f6e69bc427a43db0ac150f95fb13c13ab718d5b392ff2cc92820441f2

SHA512
be729b0ea20d0ce8a9e7856fbc4ff9c6f19332ecdfcb92ff97984b20c6de5908eba9cf0772233be60e129c127c94235ae1b6b01807ce2f4ad0dce2f3038d1cad

Download Submit
C:\Windows\System32\SysCheck.exe

Filesize
258KB

MD5
0fea74f0a3678ccf16643642beebca20

SHA1
fa769c0f95a3eb845e7ad27d0c30b3df35ebbb27

SHA256
eb590c9f6e69bc427a43db0ac150f95fb13c13ab718d5b392ff2cc92820441f2

SHA512
be729b0ea20d0ce8a9e7856fbc4ff9c6f19332ecdfcb92ff97984b20c6de5908eba9cf0772233be60e129c127c94235ae1b6b01807ce2f4ad0dce2f3038d1cad

Download Submit
memory/880-137-0x0000000021050000-0x000000002109A000-memory.dmp

Filesize
296KB

Download
memory/4936-138-0x0000000021050000-0x000000002109A000-memory.dmp

Filesize
296KB

Download