xworm | 8b3da7096981bfd3da39e2183a05fe7ceb20ec97a955c7844252c4e4432ffe7a

General

Target

OJYCX_XClient.exe
Size

52KB
MD5

704cf322a2352b2909af319b8fb321e2
SHA1

cede363819b46de6666af392e516818392fcbea1
SHA256

8b3da7096981bfd3da39e2183a05fe7ceb20ec97a955c7844252c4e4432ffe7a
SHA512

3ce9d3438fb7bf2a1e68cbf74bc654a384a9883a557e717cfd7565d91542bf5c7e8708c84b91c9aafc2ceec5bfca5f5ea2689581e22aa1c701bde9cd4029aa81
SSDEEP

1536:89UEPX1t0fbiJGVisUkbxZwF1PS96AdOCE08R:aUWQi4VfUkbxq2OZ08R

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Attributes

Install_directory
%Public%
install_file
USB.exe
pastebin_url
https://pastebin.com/raw/kG1CGVaU

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral1/memory/3676-1-0x0000000000640000-0x0000000000654000-memory.dmp	family_xworm
behavioral1/files/0x000b000000024331-62.dat	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm
Xworm family
xworm

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
4764	powershell.exe
3664	powershell.exe
4236	powershell.exe
680	powershell.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-308834014-1004923324-1191300197-1000\Control Panel\International\Geo\Nation	OJYCX_XClient.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\RtkAudUService64.lnk	OJYCX_XClient.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\RtkAudUService64.lnk	OJYCX_XClient.exe

Executes dropped EXE 2 IoCs

pid	Process
5684	RtkAudUService64
6096	RtkAudUService64

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-308834014-1004923324-1191300197-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RtkAudUService64 = "C:\\Users\\Public\\RtkAudUService64"	OJYCX_XClient.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
24	pastebin.com
25	pastebin.com

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

System Information Discovery
T1082

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
5868	schtasks.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
4764	powershell.exe
4764	powershell.exe
3664	powershell.exe
3664	powershell.exe
4236	powershell.exe
4236	powershell.exe
680	powershell.exe
680	powershell.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	3676	OJYCX_XClient.exe
Token: SeDebugPrivilege	4764	powershell.exe
Token: SeDebugPrivilege	3664	powershell.exe
Token: SeDebugPrivilege	4236	powershell.exe
Token: SeDebugPrivilege	680	powershell.exe
Token: SeDebugPrivilege	3676	OJYCX_XClient.exe
Token: SeDebugPrivilege	5684	RtkAudUService64
Token: SeDebugPrivilege	6096	RtkAudUService64

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 3676 wrote to memory of 4764	3676	OJYCX_XClient.exe	93
PID 3676 wrote to memory of 4764	3676	OJYCX_XClient.exe	93
PID 3676 wrote to memory of 3664	3676	OJYCX_XClient.exe	95
PID 3676 wrote to memory of 3664	3676	OJYCX_XClient.exe	95
PID 3676 wrote to memory of 4236	3676	OJYCX_XClient.exe	97
PID 3676 wrote to memory of 4236	3676	OJYCX_XClient.exe	97
PID 3676 wrote to memory of 680	3676	OJYCX_XClient.exe	99
PID 3676 wrote to memory of 680	3676	OJYCX_XClient.exe	99
PID 3676 wrote to memory of 5868	3676	OJYCX_XClient.exe	102
PID 3676 wrote to memory of 5868	3676	OJYCX_XClient.exe	102

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\OJYCX_XClient.exe
"C:\Users\Admin\AppData\Local\Temp\OJYCX_XClient.exe"
1⤵
- Checks computer location settings
- Drops startup file
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3676
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\OJYCX_XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4764
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'OJYCX_XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3664
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Public\RtkAudUService64'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4236
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'RtkAudUService64'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:680
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "RtkAudUService64" /tr "C:\Users\Public\RtkAudUService64"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:5868

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c C:\Users\Public\RtkAudUService64
1⤵
PID:3396

C:\Users\Public\RtkAudUService64
C:\Users\Public\RtkAudUService64
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:5684

C:\Users\Public\RtkAudUService64
C:\Users\Public\RtkAudUService64
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:6096

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\RtkAudUService64.log

Filesize
654B

MD5
2ff39f6c7249774be85fd60a8f9a245e

SHA1
684ff36b31aedc1e587c8496c02722c6698c1c4e

SHA256
e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced

SHA512
1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
28cb2b4948aa809b5d5ec5e2562b2963

SHA1
cc362f9901466466bb8b9d9d4cdaad5fce5bcd27

SHA256
69c6169a7819f11757c1d64f76b0450562412b74624150f03c6d1a6929d20eec

SHA512
fe7fd11c33284f1bf00571030b8ba7b4b69fc5cf58157b7cb8d66b8dfe3baadb9cfc2a12f27f5a8a9decdba065f60d744adb5b6ac20af629821278d8f3757930

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
bbc2b43d5e574fe7d193c6fc0eb7302c

SHA1
f22683b94ad593fd0513fef37df1fb5d0880cc22

SHA256
0efa2469ae0b02af024fd0e2828ccab085eaefef3736b3bda0ba631e3a45aa48

SHA512
287449b168297a5176b26777f2f5ca3284d967b93274db8b3029d130049073560a10e418607f670d08194193aa91fc9cd174717e7c1d051b09c23857fe3ab9d2

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
29af8a435901d77d6c0a08e494fdd160

SHA1
00ee17be16d2fccd668977caab81546ddceffc5d

SHA256
8774b8e4d75d6815a0d211272e983b0094a7542d1df584f9fc880aa68283a98f

SHA512
7d3e78f5d6d73bbb37ec7ff5b97729a1e542ae6b86eb271516a02ec67eb012872337e57a418a3f7f1b1b8cfafc2bfb246f15b75eaf45ee36fc690d946d873c99

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_inyjq0rj.v4v.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Public\RtkAudUService64

Filesize
52KB

MD5
704cf322a2352b2909af319b8fb321e2

SHA1
cede363819b46de6666af392e516818392fcbea1

SHA256
8b3da7096981bfd3da39e2183a05fe7ceb20ec97a955c7844252c4e4432ffe7a

SHA512
3ce9d3438fb7bf2a1e68cbf74bc654a384a9883a557e717cfd7565d91542bf5c7e8708c84b91c9aafc2ceec5bfca5f5ea2689581e22aa1c701bde9cd4029aa81

Download Submit
memory/3676-55-0x00007FFE554F0000-0x00007FFE55FB1000-memory.dmp

Filesize
10.8MB

Download
memory/3676-1-0x0000000000640000-0x0000000000654000-memory.dmp

Filesize
80KB

Download
memory/3676-56-0x00007FFE554F3000-0x00007FFE554F5000-memory.dmp

Filesize
8KB

Download
memory/3676-57-0x000000001BAA0000-0x000000001BAC9000-memory.dmp

Filesize
164KB

Download
memory/3676-58-0x00007FFE554F0000-0x00007FFE55FB1000-memory.dmp

Filesize
10.8MB

Download
memory/3676-0-0x00007FFE554F3000-0x00007FFE554F5000-memory.dmp

Filesize
8KB

Download
memory/4764-17-0x00007FFE554F0000-0x00007FFE55FB1000-memory.dmp

Filesize
10.8MB

Download
memory/4764-14-0x00007FFE554F0000-0x00007FFE55FB1000-memory.dmp

Filesize
10.8MB

Download
memory/4764-13-0x00007FFE554F0000-0x00007FFE55FB1000-memory.dmp

Filesize
10.8MB

Download
memory/4764-12-0x00007FFE554F0000-0x00007FFE55FB1000-memory.dmp

Filesize
10.8MB

Download
memory/4764-11-0x0000014E68D90000-0x0000014E68DB2000-memory.dmp

Filesize
136KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads