xworm | 9271cc1d1de56861488f97a6c38b4175fda1d31992bf3349aad46f79c3d6f0a6

General

Target

xclant.exe
Size

70KB
MD5

be02e2396810bc407f7ada8d02c588c1
SHA1

77c1f21128308f766fc4b359c48e63c146beca52
SHA256

9271cc1d1de56861488f97a6c38b4175fda1d31992bf3349aad46f79c3d6f0a6
SHA512

cefdd672a809016390157cd4ca9072284746e1082bfbc761f93da7b8c240244e981e739370787dfe1d9c45fce1a6bd9f990c65957411649beea2d908ecc4c907
SSDEEP

1536:zOs8dJha3EWE70GlLsAo/j5b6ybuXjGs6X9mObkU83:zOBdXQlIxo75b6fXjW9mObkn3

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

147.185.221.19:22298

Attributes

Install_directory
%AppData%
install_file
SystemUser32.exe

Signatures

Detect Xworm Payload 4 IoCs

resource	yara_rule
behavioral1/memory/2124-1-0x0000000000920000-0x0000000000938000-memory.dmp	family_xworm
behavioral1/files/0x000a000000018780-34.dat	family_xworm
behavioral1/memory/2668-36-0x0000000000E50000-0x0000000000E68000-memory.dmp	family_xworm
behavioral1/memory/2480-39-0x0000000001090000-0x00000000010A8000-memory.dmp	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
2772	powershell.exe
3020	powershell.exe
2816	powershell.exe
2888	powershell.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\SystemUser32.lnk	xclant.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\SystemUser32.lnk	xclant.exe

Executes dropped EXE 2 IoCs

pid	Process
2668	SystemUser32.exe
2480	SystemUser32.exe

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-1-5-21-2703099537-420551529-3771253338-1000\Software\Microsoft\Windows\CurrentVersion\Run\SystemUser32 = "C:\\Users\\Admin\\AppData\\Roaming\\SystemUser32.exe"	xclant.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
4	ip-api.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
1072	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2816	powershell.exe
2888	powershell.exe
2772	powershell.exe
3020	powershell.exe
2124	xclant.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	2124	xclant.exe
Token: SeDebugPrivilege	2816	powershell.exe
Token: SeDebugPrivilege	2888	powershell.exe
Token: SeDebugPrivilege	2772	powershell.exe
Token: SeDebugPrivilege	3020	powershell.exe
Token: SeDebugPrivilege	2124	xclant.exe
Token: SeDebugPrivilege	2668	SystemUser32.exe
Token: SeDebugPrivilege	2480	SystemUser32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2124	xclant.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 2124 wrote to memory of 2816	2124	xclant.exe	32
PID 2124 wrote to memory of 2816	2124	xclant.exe	32
PID 2124 wrote to memory of 2816	2124	xclant.exe	32
PID 2124 wrote to memory of 2888	2124	xclant.exe	34
PID 2124 wrote to memory of 2888	2124	xclant.exe	34
PID 2124 wrote to memory of 2888	2124	xclant.exe	34
PID 2124 wrote to memory of 2772	2124	xclant.exe	36
PID 2124 wrote to memory of 2772	2124	xclant.exe	36
PID 2124 wrote to memory of 2772	2124	xclant.exe	36
PID 2124 wrote to memory of 3020	2124	xclant.exe	38
PID 2124 wrote to memory of 3020	2124	xclant.exe	38
PID 2124 wrote to memory of 3020	2124	xclant.exe	38
PID 2124 wrote to memory of 1072	2124	xclant.exe	40
PID 2124 wrote to memory of 1072	2124	xclant.exe	40
PID 2124 wrote to memory of 1072	2124	xclant.exe	40
PID 1032 wrote to memory of 2668	1032	taskeng.exe	43
PID 1032 wrote to memory of 2668	1032	taskeng.exe	43
PID 1032 wrote to memory of 2668	1032	taskeng.exe	43
PID 1032 wrote to memory of 2480	1032	taskeng.exe	44
PID 1032 wrote to memory of 2480	1032	taskeng.exe	44
PID 1032 wrote to memory of 2480	1032	taskeng.exe	44

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\xclant.exe
"C:\Users\Admin\AppData\Local\Temp\xclant.exe"
1⤵
- Drops startup file
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2124
- 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\xclant.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2816
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'xclant.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2888
- 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\Roaming\SystemUser32.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2772
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'SystemUser32.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3020
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "SystemUser32" /tr "C:\Users\Admin\AppData\Roaming\SystemUser32.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1072

C:\Windows\system32\taskeng.exe
taskeng.exe {705124BB-0CA6-4BD8-B451-6CB48CDF5C33} S-1-5-21-2703099537-420551529-3771253338-1000:XECUDNCD\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:1032
- C:\Users\Admin\AppData\Roaming\SystemUser32.exe
  C:\Users\Admin\AppData\Roaming\SystemUser32.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2668
- C:\Users\Admin\AppData\Roaming\SystemUser32.exe
  C:\Users\Admin\AppData\Roaming\SystemUser32.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2480

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

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\SEZLNSOQTSIAOSV0JHV4.temp

Filesize
7KB

MD5
cfd518694e70210be34bda0612cd06cf

SHA1
ad01e44fe130494306280245331105ac1b93c960

SHA256
8e5d3fa0ce2d5e302adf798f37a42ee984f8aafc2f89360d8e9ceec222026767

SHA512
a77b8ecc1e13cf4d3ffbacd64f99d616ce4757e3a6d47cd2e568f667da13e5f93e1807596464b4b8fa84ffd018db6a1000e0976de8ea9cc1d400f4e3161379c1

Download Submit
C:\Users\Admin\AppData\Roaming\SystemUser32.exe

Filesize
70KB

MD5
be02e2396810bc407f7ada8d02c588c1

SHA1
77c1f21128308f766fc4b359c48e63c146beca52

SHA256
9271cc1d1de56861488f97a6c38b4175fda1d31992bf3349aad46f79c3d6f0a6

SHA512
cefdd672a809016390157cd4ca9072284746e1082bfbc761f93da7b8c240244e981e739370787dfe1d9c45fce1a6bd9f990c65957411649beea2d908ecc4c907

Download Submit
memory/2124-31-0x000007FEF50B3000-0x000007FEF50B4000-memory.dmp

Filesize
4KB

Download
memory/2124-2-0x000007FEF50B0000-0x000007FEF5A9C000-memory.dmp

Filesize
9.9MB

Download
memory/2124-0-0x000007FEF50B3000-0x000007FEF50B4000-memory.dmp

Filesize
4KB

Download
memory/2124-32-0x000007FEF50B0000-0x000007FEF5A9C000-memory.dmp

Filesize
9.9MB

Download
memory/2124-1-0x0000000000920000-0x0000000000938000-memory.dmp

Filesize
96KB

Download
memory/2480-39-0x0000000001090000-0x00000000010A8000-memory.dmp

Filesize
96KB

Download
memory/2668-36-0x0000000000E50000-0x0000000000E68000-memory.dmp

Filesize
96KB

Download
memory/2816-7-0x0000000002960000-0x00000000029E0000-memory.dmp

Filesize
512KB

Download
memory/2816-9-0x0000000002000000-0x0000000002008000-memory.dmp

Filesize
32KB

Download
memory/2816-8-0x000000001B600000-0x000000001B8E2000-memory.dmp

Filesize
2.9MB

Download
memory/2888-15-0x000000001B570000-0x000000001B852000-memory.dmp

Filesize
2.9MB

Download
memory/2888-16-0x0000000001F50000-0x0000000001F58000-memory.dmp

Filesize
32KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads