sysjoker | 76d55d16db3037d60655b8f6a4751661c2a0c94b997a28e8497db78a354e7da1

Analysis

max time kernel
131s
max time network
126s
platform
windows7_x64
resource
win7-20231215-en
resource tags

arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
submitted
15-01-2024 01:24

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General

Target

1ffd6559d21470c40dcf9236da51e5823d7ad58c93502279871c3fe7718c901c.exe
Size

392KB
MD5

d90d0f4d6dad402b5d025987030cc87c
SHA1

fad66bdf5c5dc2c050cbc574832c6995dba086a0
SHA256

1ffd6559d21470c40dcf9236da51e5823d7ad58c93502279871c3fe7718c901c
SHA512

c2faeacfd588585633630ad710f443a72c7617c2d5e37dbfe43570e6ac5904e4b81eb682356a48a93bb794ef5e9d8ad0d673966d57798079b4de62ea61241024
SSDEEP

12288:m00VdXicNHeft0d/BiqpD9JD9lusIhAzhM2RdM:mrzXiu+FZqp72iDc

Score

10^/10

sysjoker backdoor loader

Malware Config

Signatures

Detection for the Linux version of Sysjoker cross-platform backdoor 1 IoCs

Processes:

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

Detection for the macOS version of Sysjoker cross-platform backdoor 1 IoCs

Processes:

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

Detection for the windows version of Sysjoker cross-platform backdoor 1 IoCs

Processes:

resource	yara_rule
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

2612 igfxCUIService.exe

pid	process
2612	igfxCUIService.exe

Loads dropped DLL 2 IoCs

Processes:

1ffd6559d21470c40dcf9236da51e5823d7ad58c93502279871c3fe7718c901c.exe

pid	process
2008	1ffd6559d21470c40dcf9236da51e5823d7ad58c93502279871c3fe7718c901c.exe
2008	1ffd6559d21470c40dcf9236da51e5823d7ad58c93502279871c3fe7718c901c.exe

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

System Information Discovery
T1082
Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

powershell.exe

pid process

2652 powershell.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

powershell.exe

description pid process

Token: SeDebugPrivilege 2652 powershell.exe

pid	process
2652	powershell.exe

description	pid	process
Token: SeDebugPrivilege	2652	powershell.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

1ffd6559d21470c40dcf9236da51e5823d7ad58c93502279871c3fe7718c901c.exe

description	pid	process	target process
PID 2008 wrote to memory of 2652	2008	1ffd6559d21470c40dcf9236da51e5823d7ad58c93502279871c3fe7718c901c.exe	powershell.exe
PID 2008 wrote to memory of 2652	2008	1ffd6559d21470c40dcf9236da51e5823d7ad58c93502279871c3fe7718c901c.exe	powershell.exe
PID 2008 wrote to memory of 2652	2008	1ffd6559d21470c40dcf9236da51e5823d7ad58c93502279871c3fe7718c901c.exe	powershell.exe
PID 2008 wrote to memory of 2652	2008	1ffd6559d21470c40dcf9236da51e5823d7ad58c93502279871c3fe7718c901c.exe	powershell.exe
PID 2008 wrote to memory of 2612	2008	1ffd6559d21470c40dcf9236da51e5823d7ad58c93502279871c3fe7718c901c.exe	igfxCUIService.exe
PID 2008 wrote to memory of 2612	2008	1ffd6559d21470c40dcf9236da51e5823d7ad58c93502279871c3fe7718c901c.exe	igfxCUIService.exe
PID 2008 wrote to memory of 2612	2008	1ffd6559d21470c40dcf9236da51e5823d7ad58c93502279871c3fe7718c901c.exe	igfxCUIService.exe
PID 2008 wrote to memory of 2612	2008	1ffd6559d21470c40dcf9236da51e5823d7ad58c93502279871c3fe7718c901c.exe	igfxCUIService.exe

C:\Users\Admin\AppData\Local\Temp\1ffd6559d21470c40dcf9236da51e5823d7ad58c93502279871c3fe7718c901c.exe
"C:\Users\Admin\AppData\Local\Temp\1ffd6559d21470c40dcf9236da51e5823d7ad58c93502279871c3fe7718c901c.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:2008
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" copy 'C:\Users\Admin\AppData\Local\Temp\1ffd6559d21470c40dcf9236da51e5823d7ad58c93502279871c3fe7718c901c.exe' 'C:\ProgramData\SystemData\igfxCUIService.exe'
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2652
- C:\ProgramData\SystemData\igfxCUIService.exe
  "C:\ProgramData\SystemData\igfxCUIService.exe"
  2⤵
  - Executes dropped EXE
  PID:2612

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

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
memory/2652-2-0x00000000744E0000-0x0000000074A8B000-memory.dmp

Filesize
5.7MB

Download
memory/2652-3-0x00000000744E0000-0x0000000074A8B000-memory.dmp

Filesize
5.7MB

Download
memory/2652-4-0x0000000002540000-0x0000000002580000-memory.dmp

Filesize
256KB

Download
memory/2652-5-0x0000000002540000-0x0000000002580000-memory.dmp

Filesize
256KB

Download
memory/2652-7-0x00000000744E0000-0x0000000074A8B000-memory.dmp

Filesize
5.7MB

Download