sysjoker | 1ffd6559d21470c40dcf9236da51e5823d7ad58c93502279871c3fe7718c901c

Resubmissions

23/01/2022, 16:46

220123-t96bjsgbem 10

17/01/2022, 19:00

220117-xntbmsccfp 8

Analysis

max time kernel
140s
max time network
121s
platform
windows10_x64
resource
win10-en-20211208
submitted
23/01/2022, 16:46

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General

Target

msg.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 2 IoCs

resource	yara_rule
behavioral2/files/0x000300000001525a-138.dat	family_linux_sysjoker
behavioral2/files/0x000300000001525a-139.dat	family_linux_sysjoker

Detection for the mac version of Sysjoker cross-platform backdoor 2 IoCs

resource	yara_rule
behavioral2/files/0x000300000001525a-138.dat	family_macos_sysjoker
behavioral2/files/0x000300000001525a-139.dat	family_macos_sysjoker

Detection for the windows version of Sysjoker cross-platform backdoor 2 IoCs

resource	yara_rule
behavioral2/files/0x000300000001525a-138.dat	family_sysjoker
behavioral2/files/0x000300000001525a-139.dat	family_sysjoker

SysJoker
SysJoker is a cross-platform backdoor first seen in late 2021.
backdoor loader sysjoker

Executes dropped EXE 1 IoCs

pid	Process
940	igfxCUIService.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 3 IoCs

pid	Process
1748	powershell.exe
1748	powershell.exe
1748	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1748	powershell.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2644 wrote to memory of 1748	2644	msg.exe	71
PID 2644 wrote to memory of 1748	2644	msg.exe	71
PID 2644 wrote to memory of 1748	2644	msg.exe	71
PID 2644 wrote to memory of 940	2644	msg.exe	73
PID 2644 wrote to memory of 940	2644	msg.exe	73
PID 2644 wrote to memory of 940	2644	msg.exe	73

C:\Users\Admin\AppData\Local\Temp\msg.exe
"C:\Users\Admin\AppData\Local\Temp\msg.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2644
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" copy 'C:\Users\Admin\AppData\Local\Temp\msg.exe' 'C:\ProgramData\SystemData\igfxCUIService.exe'
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1748
- C:\ProgramData\SystemData\igfxCUIService.exe
  "C:\ProgramData\SystemData\igfxCUIService.exe"
  2⤵
  - Executes dropped EXE
  PID:940

Network

MITRE ATT&CK Enterprise v6

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

memory/1748-124-0x0000000007D10000-0x0000000007D2C000-memory.dmp

Filesize
112KB

Download
memory/1748-125-0x0000000008080000-0x00000000080CB000-memory.dmp

Filesize
300KB

Download
memory/1748-120-0x0000000006F70000-0x0000000006F92000-memory.dmp

Filesize
136KB

Download
memory/1748-121-0x0000000007010000-0x0000000007076000-memory.dmp

Filesize
408KB

Download
memory/1748-122-0x0000000007080000-0x00000000070E6000-memory.dmp

Filesize
408KB

Download
memory/1748-123-0x0000000007900000-0x0000000007C50000-memory.dmp

Filesize
3.3MB

Download
memory/1748-116-0x0000000004580000-0x00000000045B6000-memory.dmp

Filesize
216KB

Download
memory/1748-119-0x0000000004490000-0x00000000044C3000-memory.dmp

Filesize
204KB

Download
memory/1748-126-0x0000000007F80000-0x0000000007FF6000-memory.dmp

Filesize
472KB

Download
memory/1748-133-0x0000000009140000-0x00000000091D4000-memory.dmp

Filesize
592KB

Download
memory/1748-134-0x0000000008E00000-0x0000000008E1A000-memory.dmp

Filesize
104KB

Download
memory/1748-135-0x0000000008E90000-0x0000000008EB2000-memory.dmp

Filesize
136KB

Download
memory/1748-136-0x00000000096E0000-0x0000000009BDE000-memory.dmp

Filesize
5.0MB

Download
memory/1748-118-0x00000000044C0000-0x00000000044C1000-memory.dmp

Filesize
4KB

Download
memory/1748-117-0x00000000070F0000-0x0000000007718000-memory.dmp

Filesize
6.2MB

Download