xworm | c5a25cc0d10e27fab14c3563e826bef321f31c5128026b30227cddef219d2b85

General

Target

XClient.exe
Size

162KB
MD5

91331ecd6344f80b02ccac9760a3fcbe
SHA1

572029a44d99a64fbd8ca759ddd41a3391f3abb3
SHA256

c5a25cc0d10e27fab14c3563e826bef321f31c5128026b30227cddef219d2b85
SHA512

5a67bb04be2f462b34e6e17208d6d6ce045c0602b6b8c6fa03564c6577e1875f33abecdcb4cc6dc302b52c23de6ac0bb8832e0a2c17e738ded74357fb7f4ae35
SSDEEP

3072:I20sqx/l+bwQ/7Wb1Olk3oM5yBz65/M6If+3Js+3JFkKeTno:bA/Mbn/77y5yxBt25

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Attributes

Install_directory
%Temp%
install_file
svchost.exe
pastebin_url
https://pastebin.com/raw/kADeGNZE

Signatures

Detect Xworm Payload 4 IoCs

resource	yara_rule
behavioral1/memory/2848-1-0x0000000000C60000-0x0000000000C8E000-memory.dmp	family_xworm
behavioral1/files/0x000d0000000122cf-36.dat	family_xworm
behavioral1/memory/1748-38-0x0000000001140000-0x000000000116E000-memory.dmp	family_xworm
behavioral1/memory/2424-42-0x0000000000200000-0x000000000022E000-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
2712	powershell.exe
2024	powershell.exe
2384	powershell.exe
2840	powershell.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 3 IoCs

pid	Process
1748	svchost.exe
2132	svchost.exe
2424	svchost.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\svchost = "C:\\Users\\Admin\\AppData\\Local\\Temp\\svchost.exe"	XClient.exe

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

Web Service

T1102

flow	ioc
5	pastebin.com
4	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
2892	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2384	powershell.exe
2840	powershell.exe
2712	powershell.exe
2024	powershell.exe
2848	XClient.exe

Suspicious use of AdjustPrivilegeToken 9 IoCs

description	pid	Process
Token: SeDebugPrivilege	2848	XClient.exe
Token: SeDebugPrivilege	2384	powershell.exe
Token: SeDebugPrivilege	2840	powershell.exe
Token: SeDebugPrivilege	2712	powershell.exe
Token: SeDebugPrivilege	2024	powershell.exe
Token: SeDebugPrivilege	2848	XClient.exe
Token: SeDebugPrivilege	1748	svchost.exe
Token: SeDebugPrivilege	2132	svchost.exe
Token: SeDebugPrivilege	2424	svchost.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2848	XClient.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 2848 wrote to memory of 2384	2848	XClient.exe	32
PID 2848 wrote to memory of 2384	2848	XClient.exe	32
PID 2848 wrote to memory of 2384	2848	XClient.exe	32
PID 2848 wrote to memory of 2840	2848	XClient.exe	34
PID 2848 wrote to memory of 2840	2848	XClient.exe	34
PID 2848 wrote to memory of 2840	2848	XClient.exe	34
PID 2848 wrote to memory of 2712	2848	XClient.exe	36
PID 2848 wrote to memory of 2712	2848	XClient.exe	36
PID 2848 wrote to memory of 2712	2848	XClient.exe	36
PID 2848 wrote to memory of 2024	2848	XClient.exe	38
PID 2848 wrote to memory of 2024	2848	XClient.exe	38
PID 2848 wrote to memory of 2024	2848	XClient.exe	38
PID 2848 wrote to memory of 2892	2848	XClient.exe	40
PID 2848 wrote to memory of 2892	2848	XClient.exe	40
PID 2848 wrote to memory of 2892	2848	XClient.exe	40
PID 1680 wrote to memory of 1748	1680	taskeng.exe	43
PID 1680 wrote to memory of 1748	1680	taskeng.exe	43
PID 1680 wrote to memory of 1748	1680	taskeng.exe	43
PID 1680 wrote to memory of 2132	1680	taskeng.exe	45
PID 1680 wrote to memory of 2132	1680	taskeng.exe	45
PID 1680 wrote to memory of 2132	1680	taskeng.exe	45
PID 1680 wrote to memory of 2424	1680	taskeng.exe	46
PID 1680 wrote to memory of 2424	1680	taskeng.exe	46
PID 1680 wrote to memory of 2424	1680	taskeng.exe	46

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\XClient.exe
"C:\Users\Admin\AppData\Local\Temp\XClient.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:2848
- 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\XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2384
- 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:2840
- 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\svchost.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2712
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'svchost.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2024
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "svchost" /tr "C:\Users\Admin\AppData\Local\Temp\svchost.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2892

C:\Windows\system32\taskeng.exe
taskeng.exe {B42A1820-422F-4C5E-BB74-2613F9E5C526} S-1-5-21-2703099537-420551529-3771253338-1000:XECUDNCD\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:1680
- C:\Users\Admin\AppData\Local\Temp\svchost.exe
  C:\Users\Admin\AppData\Local\Temp\svchost.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1748
- C:\Users\Admin\AppData\Local\Temp\svchost.exe
  C:\Users\Admin\AppData\Local\Temp\svchost.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2132
- C:\Users\Admin\AppData\Local\Temp\svchost.exe
  C:\Users\Admin\AppData\Local\Temp\svchost.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2424

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

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\svchost.exe

Filesize
162KB

MD5
91331ecd6344f80b02ccac9760a3fcbe

SHA1
572029a44d99a64fbd8ca759ddd41a3391f3abb3

SHA256
c5a25cc0d10e27fab14c3563e826bef321f31c5128026b30227cddef219d2b85

SHA512
5a67bb04be2f462b34e6e17208d6d6ce045c0602b6b8c6fa03564c6577e1875f33abecdcb4cc6dc302b52c23de6ac0bb8832e0a2c17e738ded74357fb7f4ae35

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

Filesize
7KB

MD5
96272597062501b01578e55802885b03

SHA1
ae019f114112267ac97a65ea182874821028c929

SHA256
7bdcacc642e622e8b6fe0c71bb9b17577d535a7ef1b16da2e8d4839963a36fc3

SHA512
a3682010c7041bfc95b088ca39945431b8689e2e945a86724273e6cf0337dd1960a1e616ddc1329746e62ccde105b8efbe177e4cf8c07f300eb42ea2ae2d9851

Download Submit
memory/1748-38-0x0000000001140000-0x000000000116E000-memory.dmp

Filesize
184KB

Download
memory/2384-6-0x0000000002B50000-0x0000000002BD0000-memory.dmp

Filesize
512KB

Download
memory/2384-7-0x000000001B710000-0x000000001B9F2000-memory.dmp

Filesize
2.9MB

Download
memory/2384-8-0x0000000001F80000-0x0000000001F88000-memory.dmp

Filesize
32KB

Download
memory/2424-42-0x0000000000200000-0x000000000022E000-memory.dmp

Filesize
184KB

Download
memory/2840-14-0x000000001B6D0000-0x000000001B9B2000-memory.dmp

Filesize
2.9MB

Download
memory/2840-15-0x0000000002860000-0x0000000002868000-memory.dmp

Filesize
32KB

Download
memory/2848-32-0x0000000000450000-0x00000000004D0000-memory.dmp

Filesize
512KB

Download
memory/2848-33-0x000007FEF5D23000-0x000007FEF5D24000-memory.dmp

Filesize
4KB

Download
memory/2848-34-0x0000000000450000-0x00000000004D0000-memory.dmp

Filesize
512KB

Download
memory/2848-0-0x000007FEF5D23000-0x000007FEF5D24000-memory.dmp

Filesize
4KB

Download
memory/2848-1-0x0000000000C60000-0x0000000000C8E000-memory.dmp

Filesize
184KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads