xworm | 6e552c8d82a2553ec83fea57d340561834aeac22ae30d6a81692f2eee6651e14

General

Target

loader.exe
Size

61KB
MD5

427cae9ddc40f9a7ea51459fc265d9be
SHA1

8c68b6be3529637908878e64a020dd99c3bf98ad
SHA256

4a1a9976a6fc9351ce34db0c601952328f52b526894cea614b51879c065e89a4
SHA512

da5d985814986580a53712df240dad2dd876a16aeebab7e89ddc9968a8d2305dbf1cb695e1fa812ac534f27f1dfabf1be8aedac1f07d1b311163843f905a47a1
SSDEEP

1536:SAXBcwCcPCxLgk2BeVbcqbhc48Ulk36nJNOOKLj:SAyvcPCaJe9Pbhc0hcOKLj

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

submit-processing.gl.at.ply.gg:54034

Attributes

Install_directory
%AppData%
install_file
XClient.exe

Signatures

Detect Xworm Payload 3 IoCs

resource	yara_rule
behavioral5/memory/2352-1-0x00000000012E0000-0x00000000012F6000-memory.dmp	family_xworm
behavioral5/files/0x000b0000000120f1-34.dat	family_xworm
behavioral5/memory/1448-36-0x0000000000E30000-0x0000000000E46000-memory.dmp	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat 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
2728	powershell.exe
2608	powershell.exe
2224	powershell.exe
2488	powershell.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 2 IoCs

pid	Process
1448	XClient.exe
1588	XClient.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-1-5-21-3294248377-1418901787-4083263181-1000\Software\Microsoft\Windows\CurrentVersion\Run\XClient = "C:\\Users\\Admin\\AppData\\Roaming\\XClient.exe"	loader.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
2	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
2712	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2728	powershell.exe
2608	powershell.exe
2224	powershell.exe
2488	powershell.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	2352	loader.exe
Token: SeDebugPrivilege	2728	powershell.exe
Token: SeDebugPrivilege	2608	powershell.exe
Token: SeDebugPrivilege	2224	powershell.exe
Token: SeDebugPrivilege	2488	powershell.exe
Token: SeDebugPrivilege	2352	loader.exe
Token: SeDebugPrivilege	1448	XClient.exe
Token: SeDebugPrivilege	1588	XClient.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 2352 wrote to memory of 2728	2352	loader.exe	31
PID 2352 wrote to memory of 2728	2352	loader.exe	31
PID 2352 wrote to memory of 2728	2352	loader.exe	31
PID 2352 wrote to memory of 2608	2352	loader.exe	33
PID 2352 wrote to memory of 2608	2352	loader.exe	33
PID 2352 wrote to memory of 2608	2352	loader.exe	33
PID 2352 wrote to memory of 2224	2352	loader.exe	35
PID 2352 wrote to memory of 2224	2352	loader.exe	35
PID 2352 wrote to memory of 2224	2352	loader.exe	35
PID 2352 wrote to memory of 2488	2352	loader.exe	37
PID 2352 wrote to memory of 2488	2352	loader.exe	37
PID 2352 wrote to memory of 2488	2352	loader.exe	37
PID 2352 wrote to memory of 2712	2352	loader.exe	39
PID 2352 wrote to memory of 2712	2352	loader.exe	39
PID 2352 wrote to memory of 2712	2352	loader.exe	39
PID 1292 wrote to memory of 1448	1292	taskeng.exe	43
PID 1292 wrote to memory of 1448	1292	taskeng.exe	43
PID 1292 wrote to memory of 1448	1292	taskeng.exe	43
PID 1292 wrote to memory of 1588	1292	taskeng.exe	44
PID 1292 wrote to memory of 1588	1292	taskeng.exe	44
PID 1292 wrote to memory of 1588	1292	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\loader.exe
"C:\Users\Admin\AppData\Local\Temp\loader.exe"
1⤵
- Drops startup file
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2352
- 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\loader.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2728
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'loader.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2608
- 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\XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2224
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2488
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "XClient" /tr "C:\Users\Admin\AppData\Roaming\XClient.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2712

C:\Windows\system32\taskeng.exe
taskeng.exe {850EC78D-BC9D-4F99-9CD4-5BA7437DB2B3} S-1-5-21-3294248377-1418901787-4083263181-1000:FMEDFXFE\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:1292
- C:\Users\Admin\AppData\Roaming\XClient.exe
  C:\Users\Admin\AppData\Roaming\XClient.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1448
- C:\Users\Admin\AppData\Roaming\XClient.exe
  C:\Users\Admin\AppData\Roaming\XClient.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1588

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

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
37d84024ee3046f63fa633f0614e45e5

SHA1
dff6297fa9eef68666a09e309e8f18d826d5b0ba

SHA256
7b6e57e2466e35a73b7972661161d5ef1f5ea6d766ecee5854c2a42f6e5534df

SHA512
5f62c70786fcbb77c7dc492eda94e049b2958e14b12f56860bd7f96e0e2683e55f6a7be51d24cea86955e1ba3e812e87ff55709a0249d42189cd2095cb78078c

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

Filesize
61KB

MD5
427cae9ddc40f9a7ea51459fc265d9be

SHA1
8c68b6be3529637908878e64a020dd99c3bf98ad

SHA256
4a1a9976a6fc9351ce34db0c601952328f52b526894cea614b51879c065e89a4

SHA512
da5d985814986580a53712df240dad2dd876a16aeebab7e89ddc9968a8d2305dbf1cb695e1fa812ac534f27f1dfabf1be8aedac1f07d1b311163843f905a47a1

Download Submit
memory/1448-36-0x0000000000E30000-0x0000000000E46000-memory.dmp

Filesize
88KB

Download
memory/2352-31-0x000007FEF5103000-0x000007FEF5104000-memory.dmp

Filesize
4KB

Download
memory/2352-1-0x00000000012E0000-0x00000000012F6000-memory.dmp

Filesize
88KB

Download
memory/2352-2-0x000007FEF5100000-0x000007FEF5AEC000-memory.dmp

Filesize
9.9MB

Download
memory/2352-0-0x000007FEF5103000-0x000007FEF5104000-memory.dmp

Filesize
4KB

Download
memory/2352-32-0x000007FEF5100000-0x000007FEF5AEC000-memory.dmp

Filesize
9.9MB

Download
memory/2608-14-0x000000001B5A0000-0x000000001B882000-memory.dmp

Filesize
2.9MB

Download
memory/2608-15-0x0000000002290000-0x0000000002298000-memory.dmp

Filesize
32KB

Download
memory/2728-8-0x0000000001F70000-0x0000000001F78000-memory.dmp

Filesize
32KB

Download
memory/2728-7-0x000000001B660000-0x000000001B942000-memory.dmp

Filesize
2.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads