sysjoker | 1ffd6559d21470c40dcf9236da51e5823d7ad58c93502279871c3fe7718c901c

General

Target

tmpscsa0hng.exe
Size

392KB
MD5

d90d0f4d6dad402b5d025987030cc87c
SHA1

fad66bdf5c5dc2c050cbc574832c6995dba086a0
SHA256

1ffd6559d21470c40dcf9236da51e5823d7ad58c93502279871c3fe7718c901c
SHA512

c2faeacfd588585633630ad710f443a72c7617c2d5e37dbfe43570e6ac5904e4b81eb682356a48a93bb794ef5e9d8ad0d673966d57798079b4de62ea61241024

Score

10^/10

sysjoker backdoor loader

Malware Config

Signatures

Detection for the Linux version of Sysjoker cross-platform backdoor 4 IoCs

Processes:

resource	yara_rule
C:\ProgramData\SystemData\igfxCUIService.exe	family_linux_sysjoker
\ProgramData\SystemData\igfxCUIService.exe	family_linux_sysjoker
\ProgramData\SystemData\igfxCUIService.exe	family_linux_sysjoker
C:\ProgramData\SystemData\igfxCUIService.exe	family_linux_sysjoker

Detection for the macOS version of Sysjoker cross-platform backdoor 4 IoCs

Processes:

resource	yara_rule
C:\ProgramData\SystemData\igfxCUIService.exe	family_macos_sysjoker
\ProgramData\SystemData\igfxCUIService.exe	family_macos_sysjoker
\ProgramData\SystemData\igfxCUIService.exe	family_macos_sysjoker
C:\ProgramData\SystemData\igfxCUIService.exe	family_macos_sysjoker

Detection for the windows version of Sysjoker cross-platform backdoor 4 IoCs

Processes:

resource	yara_rule
C:\ProgramData\SystemData\igfxCUIService.exe	family_sysjoker
\ProgramData\SystemData\igfxCUIService.exe	family_sysjoker
\ProgramData\SystemData\igfxCUIService.exe	family_sysjoker
C:\ProgramData\SystemData\igfxCUIService.exe	family_sysjoker

SysJoker
SysJoker is a cross-platform backdoor first seen in late 2021.
backdoor loader sysjoker
Executes dropped EXE 1 IoCs

Processes:

igfxCUIService.exe

pid process

904 igfxCUIService.exe
Loads dropped DLL 2 IoCs

Processes:

tmpscsa0hng.exe

pid process

1420 tmpscsa0hng.exe
1420 tmpscsa0hng.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

powershell.exe

pid process

1728 powershell.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

powershell.exe

description pid process

Token: SeDebugPrivilege 1728 powershell.exe

pid	process
904	igfxCUIService.exe

pid	process
1420	tmpscsa0hng.exe
1420	tmpscsa0hng.exe

pid	process
1728	powershell.exe

description	pid	process
Token: SeDebugPrivilege	1728	powershell.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

tmpscsa0hng.exe

description	pid	process	target process
PID 1420 wrote to memory of 1728	1420	tmpscsa0hng.exe	powershell.exe
PID 1420 wrote to memory of 1728	1420	tmpscsa0hng.exe	powershell.exe
PID 1420 wrote to memory of 1728	1420	tmpscsa0hng.exe	powershell.exe
PID 1420 wrote to memory of 1728	1420	tmpscsa0hng.exe	powershell.exe
PID 1420 wrote to memory of 904	1420	tmpscsa0hng.exe	igfxCUIService.exe
PID 1420 wrote to memory of 904	1420	tmpscsa0hng.exe	igfxCUIService.exe
PID 1420 wrote to memory of 904	1420	tmpscsa0hng.exe	igfxCUIService.exe
PID 1420 wrote to memory of 904	1420	tmpscsa0hng.exe	igfxCUIService.exe

C:\Users\Admin\AppData\Local\Temp\tmpscsa0hng.exe
"C:\Users\Admin\AppData\Local\Temp\tmpscsa0hng.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1420
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" copy 'C:\Users\Admin\AppData\Local\Temp\tmpscsa0hng.exe' 'C:\ProgramData\SystemData\igfxCUIService.exe'
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1728
- C:\ProgramData\SystemData\igfxCUIService.exe
  "C:\ProgramData\SystemData\igfxCUIService.exe"
  2⤵
  - Executes dropped EXE
  PID:904

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\ProgramData\SystemData\igfxCUIService.exe

Filesize
392KB

MD5
d90d0f4d6dad402b5d025987030cc87c

SHA1
fad66bdf5c5dc2c050cbc574832c6995dba086a0

SHA256
1ffd6559d21470c40dcf9236da51e5823d7ad58c93502279871c3fe7718c901c

SHA512
c2faeacfd588585633630ad710f443a72c7617c2d5e37dbfe43570e6ac5904e4b81eb682356a48a93bb794ef5e9d8ad0d673966d57798079b4de62ea61241024

Download Submit
C:\ProgramData\SystemData\igfxCUIService.exe

Filesize
392KB

MD5
d90d0f4d6dad402b5d025987030cc87c

SHA1
fad66bdf5c5dc2c050cbc574832c6995dba086a0

SHA256
1ffd6559d21470c40dcf9236da51e5823d7ad58c93502279871c3fe7718c901c

SHA512
c2faeacfd588585633630ad710f443a72c7617c2d5e37dbfe43570e6ac5904e4b81eb682356a48a93bb794ef5e9d8ad0d673966d57798079b4de62ea61241024

Download Submit
\ProgramData\SystemData\igfxCUIService.exe

Filesize
392KB

MD5
d90d0f4d6dad402b5d025987030cc87c

SHA1
fad66bdf5c5dc2c050cbc574832c6995dba086a0

SHA256
1ffd6559d21470c40dcf9236da51e5823d7ad58c93502279871c3fe7718c901c

SHA512
c2faeacfd588585633630ad710f443a72c7617c2d5e37dbfe43570e6ac5904e4b81eb682356a48a93bb794ef5e9d8ad0d673966d57798079b4de62ea61241024

Download Submit
\ProgramData\SystemData\igfxCUIService.exe

Filesize
392KB

MD5
d90d0f4d6dad402b5d025987030cc87c

SHA1
fad66bdf5c5dc2c050cbc574832c6995dba086a0

SHA256
1ffd6559d21470c40dcf9236da51e5823d7ad58c93502279871c3fe7718c901c

SHA512
c2faeacfd588585633630ad710f443a72c7617c2d5e37dbfe43570e6ac5904e4b81eb682356a48a93bb794ef5e9d8ad0d673966d57798079b4de62ea61241024

Download Submit
memory/904-62-0x0000000000000000-mapping.dmp

Download
memory/1420-54-0x0000000075591000-0x0000000075593000-memory.dmp

Filesize
8KB

Download
memory/1728-55-0x0000000000000000-mapping.dmp

Download
memory/1728-57-0x0000000073840000-0x0000000073DEB000-memory.dmp

Filesize
5.7MB

Download
memory/1728-58-0x0000000073840000-0x0000000073DEB000-memory.dmp

Filesize
5.7MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads