xworm | a5a5c28c12ee6698c3965e33182bc04b9a1786cdb0575ae951706b77ac205a5a

General

Target

XClient.exe
Size

74KB
MD5

19982b09ca5db29a23d8548f68dbfc9d
SHA1

da7df1a2ef9f965864b9537c156e7a830038a0a7
SHA256

a5a5c28c12ee6698c3965e33182bc04b9a1786cdb0575ae951706b77ac205a5a
SHA512

df21ba0bcd2af139fde055aec3bebc22b93fb13701aa85b8252d8090c20325fbe56011112fb43cf410bf9973a8a8b6a7bb10c50a30bb7678838df03064bf04ab
SSDEEP

1536:9JPmE4wdmhLx8UADbXjH0cRtl6sKO1c7hO5r:z+ENgZxxADbzBnKO1c7ar

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

sources-alerts.gl.at.ply.gg:1999

Attributes

Install_directory
%AppData%
install_file
FileExplorer.exe

Signatures

Detect Xworm Payload 4 IoCs

resource	yara_rule
behavioral1/memory/2336-1-0x0000000000310000-0x0000000000328000-memory.dmp	family_xworm
behavioral1/files/0x0006000000004ed7-35.dat	family_xworm
behavioral1/memory/2036-37-0x0000000000DC0000-0x0000000000DD8000-memory.dmp	family_xworm
behavioral1/memory/2412-40-0x0000000001200000-0x0000000001218000-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
2652	powershell.exe
2676	powershell.exe
2744	powershell.exe
2704	powershell.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 2 IoCs

pid	Process
2036	FileExplorer.exe
2412	FileExplorer.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-1-5-21-3290804112-2823094203-3137964600-1000\Software\Microsoft\Windows\CurrentVersion\Run\FileExplorer = "C:\\Users\\Admin\\AppData\\Roaming\\FileExplorer.exe"	XClient.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
1644	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2676	powershell.exe
2744	powershell.exe
2704	powershell.exe
2652	powershell.exe
2336	XClient.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	2336	XClient.exe
Token: SeDebugPrivilege	2676	powershell.exe
Token: SeDebugPrivilege	2744	powershell.exe
Token: SeDebugPrivilege	2704	powershell.exe
Token: SeDebugPrivilege	2652	powershell.exe
Token: SeDebugPrivilege	2336	XClient.exe
Token: SeDebugPrivilege	2036	FileExplorer.exe
Token: SeDebugPrivilege	2412	FileExplorer.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2336	XClient.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 2336 wrote to memory of 2676	2336	XClient.exe	32
PID 2336 wrote to memory of 2676	2336	XClient.exe	32
PID 2336 wrote to memory of 2676	2336	XClient.exe	32
PID 2336 wrote to memory of 2744	2336	XClient.exe	34
PID 2336 wrote to memory of 2744	2336	XClient.exe	34
PID 2336 wrote to memory of 2744	2336	XClient.exe	34
PID 2336 wrote to memory of 2704	2336	XClient.exe	36
PID 2336 wrote to memory of 2704	2336	XClient.exe	36
PID 2336 wrote to memory of 2704	2336	XClient.exe	36
PID 2336 wrote to memory of 2652	2336	XClient.exe	38
PID 2336 wrote to memory of 2652	2336	XClient.exe	38
PID 2336 wrote to memory of 2652	2336	XClient.exe	38
PID 2336 wrote to memory of 1644	2336	XClient.exe	40
PID 2336 wrote to memory of 1644	2336	XClient.exe	40
PID 2336 wrote to memory of 1644	2336	XClient.exe	40
PID 2600 wrote to memory of 2036	2600	taskeng.exe	43
PID 2600 wrote to memory of 2036	2600	taskeng.exe	43
PID 2600 wrote to memory of 2036	2600	taskeng.exe	43
PID 2600 wrote to memory of 2412	2600	taskeng.exe	45
PID 2600 wrote to memory of 2412	2600	taskeng.exe	45
PID 2600 wrote to memory of 2412	2600	taskeng.exe	45

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:2336
- 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:2676
- 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:2744
- 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\FileExplorer.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2704
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'FileExplorer.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2652
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "FileExplorer" /tr "C:\Users\Admin\AppData\Roaming\FileExplorer.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1644

C:\Windows\system32\taskeng.exe
taskeng.exe {AF56CDEB-FE81-4E27-A638-6E639687B2F4} S-1-5-21-3290804112-2823094203-3137964600-1000:VORHPBAB\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2600
- C:\Users\Admin\AppData\Roaming\FileExplorer.exe
  C:\Users\Admin\AppData\Roaming\FileExplorer.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2036
- C:\Users\Admin\AppData\Roaming\FileExplorer.exe
  C:\Users\Admin\AppData\Roaming\FileExplorer.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2412

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\FileExplorer.exe

Filesize
74KB

MD5
19982b09ca5db29a23d8548f68dbfc9d

SHA1
da7df1a2ef9f965864b9537c156e7a830038a0a7

SHA256
a5a5c28c12ee6698c3965e33182bc04b9a1786cdb0575ae951706b77ac205a5a

SHA512
df21ba0bcd2af139fde055aec3bebc22b93fb13701aa85b8252d8090c20325fbe56011112fb43cf410bf9973a8a8b6a7bb10c50a30bb7678838df03064bf04ab

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

Filesize
7KB

MD5
4f6b7e9e2f5a1aadb026f171f3eb8e90

SHA1
83df20bc2669e93503d18cd2ee7fbdc55f56197e

SHA256
53d991efa9973eeeb0f380472573a5f1e58d496df1f87011824eadaa521c970a

SHA512
67c51bb5235b9a4231c82a85b39cb29f566af0ebdd70835aa665a261bc09980e0e39443b4df1b97cfe6939effd947e90725f751a881b03e87d3ce3ba277b4f0c

Download Submit
memory/2036-37-0x0000000000DC0000-0x0000000000DD8000-memory.dmp

Filesize
96KB

Download
memory/2336-2-0x000007FEF6510000-0x000007FEF6EFC000-memory.dmp

Filesize
9.9MB

Download
memory/2336-0-0x000007FEF6513000-0x000007FEF6514000-memory.dmp

Filesize
4KB

Download
memory/2336-28-0x000007FEF6513000-0x000007FEF6514000-memory.dmp

Filesize
4KB

Download
memory/2336-33-0x000007FEF6510000-0x000007FEF6EFC000-memory.dmp

Filesize
9.9MB

Download
memory/2336-1-0x0000000000310000-0x0000000000328000-memory.dmp

Filesize
96KB

Download
memory/2412-40-0x0000000001200000-0x0000000001218000-memory.dmp

Filesize
96KB

Download
memory/2676-7-0x0000000002010000-0x0000000002090000-memory.dmp

Filesize
512KB

Download
memory/2676-8-0x000000001B700000-0x000000001B9E2000-memory.dmp

Filesize
2.9MB

Download
memory/2676-9-0x0000000001FC0000-0x0000000001FC8000-memory.dmp

Filesize
32KB

Download
memory/2744-15-0x000000001B4B0000-0x000000001B792000-memory.dmp

Filesize
2.9MB

Download
memory/2744-16-0x0000000001F00000-0x0000000001F08000-memory.dmp

Filesize
32KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads