xworm | 8e6a1ef0257f98ada6c7eb9425d0211dced8368795613771998bd3bd510ac1e1

Analysis

max time kernel
149s
max time network
148s
platform
windows7_x64
resource
win7-20240508-en
resource tags

arch:x64arch:x86image:win7-20240508-enlocale:en-usos:windows7-x64system
submitted
04/06/2024, 15:52

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General

Target
XClient.exe
Size 71KB
Sample240604-tbkxyscf65
SHA256 8e6a1ef0257f98ada6c7eb9425d0211dced8368795613771998bd3bd510ac1e1
MD5 1dd48d185245b889afabab3648238dbb
SHA1 d0d3f8ca8ddf3f8770690d84195e6bee49cb3623
SHA512 96315d58f8878230e9fd195008fa96e5883673bcd832bea6ba842f104495bdc19e8317d9673153cd68b2db8bfec4237324e1265a27fcf1ba9cba7ebcd4db1041
SSDEEP 1536:zzXdgEmYWm8eYBPz+tbdE6hu66YnCJO7w0tf7qqzL:3ootbdCbOU09vL
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Version

ayumi-27013.portmap.host:27013

Attributes

Install_directory
%AppData%
install_file
USB.exe

Signatures

Detect Xworm Payload 3 IoCs

resource	yara_rule
behavioral2/memory/616-1-0x0000000000CE0000-0x0000000000CF8000-memory.dmp	family_xworm
behavioral2/files/0x001000000000549e-27.dat	family_xworm
behavioral2/memory/2848-34-0x0000000001330000-0x0000000001348000-memory.dmp	family_xworm

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

Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs

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

execution

PowerShell

T1059.001

pid	Process
2764	powershell.exe
1420	powershell.exe
2716	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	XClient.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\XClient.lnk	XClient.exe

Executes dropped EXE 2 IoCs

pid	Process
2848	XClient.exe
2740	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-1-5-21-2737914667-933161113-3798636211-1000\Software\Microsoft\Windows\CurrentVersion\Run\XClient = "C:\\Users\\Admin\\AppData\\Roaming\\XClient.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
2	ip-api.com

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
1376	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2764	powershell.exe
1420	powershell.exe
2716	powershell.exe
616	XClient.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	616	XClient.exe
Token: SeDebugPrivilege	2764	powershell.exe
Token: SeDebugPrivilege	1420	powershell.exe
Token: SeDebugPrivilege	2716	powershell.exe
Token: SeDebugPrivilege	616	XClient.exe
Token: SeDebugPrivilege	2848	XClient.exe
Token: SeDebugPrivilege	2740	XClient.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
616	XClient.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 616 wrote to memory of 2764	616	XClient.exe	29
PID 616 wrote to memory of 2764	616	XClient.exe	29
PID 616 wrote to memory of 2764	616	XClient.exe	29
PID 616 wrote to memory of 1420	616	XClient.exe	31
PID 616 wrote to memory of 1420	616	XClient.exe	31
PID 616 wrote to memory of 1420	616	XClient.exe	31
PID 616 wrote to memory of 2716	616	XClient.exe	33
PID 616 wrote to memory of 2716	616	XClient.exe	33
PID 616 wrote to memory of 2716	616	XClient.exe	33
PID 616 wrote to memory of 1376	616	XClient.exe	35
PID 616 wrote to memory of 1376	616	XClient.exe	35
PID 616 wrote to memory of 1376	616	XClient.exe	35
PID 2840 wrote to memory of 2848	2840	taskeng.exe	40
PID 2840 wrote to memory of 2848	2840	taskeng.exe	40
PID 2840 wrote to memory of 2848	2840	taskeng.exe	40
PID 2840 wrote to memory of 2740	2840	taskeng.exe	41
PID 2840 wrote to memory of 2740	2840	taskeng.exe	41
PID 2840 wrote to memory of 2740	2840	taskeng.exe	41

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:616
- 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:2764
- 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:1420
- 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:2716
- 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⤵
  - Creates scheduled task(s)
  PID:1376

C:\Windows\system32\taskeng.exe
taskeng.exe {9164C933-AF3D-4071-9EF8-D9BDA21D510D} S-1-5-21-2737914667-933161113-3798636211-1000:PUMARTNR\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2840
- C:\Users\Admin\AppData\Roaming\XClient.exe
  C:\Users\Admin\AppData\Roaming\XClient.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2848
- C:\Users\Admin\AppData\Roaming\XClient.exe
  C:\Users\Admin\AppData\Roaming\XClient.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2740

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

590aee7bdd69b59b.customDestinations-ms

Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms
Size 7KB
SHA256 336960993af010ca4d3b71c423041b12889f5c466c055ec2e25fe87275b1c703
MD5 362adb3157302d2d9676ca4c3ee3e687
SHA1 8f9e43bc757975047473bd2e3020b5568d1732db
SHA512 80ba836ba5b5cd0c8fedaaf40252cfcae5748b06ec97d6367ba64901a7f89748a144537642e2f257fd83cc1e249590711f6ddc1e4b09a84964da6f10bde08a5e
SSDEEP 96:NK1GCCFOM8znqvsqvJCwofK1GCCFOM8znqvsEHyqvJCworOwQtQHBd7boXlUVd:Y3XUoi3XAHnorOREd7boS
MD5 SHA1 SHA512 SSDEEP

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XClient.exe

Path C:\Users\Admin\AppData\Roaming\XClient.exe
Size 71KB
SHA256 8e6a1ef0257f98ada6c7eb9425d0211dced8368795613771998bd3bd510ac1e1
MD5 1dd48d185245b889afabab3648238dbb
SHA1 d0d3f8ca8ddf3f8770690d84195e6bee49cb3623
SHA512 96315d58f8878230e9fd195008fa96e5883673bcd832bea6ba842f104495bdc19e8317d9673153cd68b2db8bfec4237324e1265a27fcf1ba9cba7ebcd4db1041
SSDEEP 1536:zzXdgEmYWm8eYBPz+tbdE6hu66YnCJO7w0tf7qqzL:3ootbdCbOU09vL
MD5 SHA1 SHA512 SSDEEP

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memory/616-0-0x000007FEF50E3000-0x000007FEF50E4000-memory.dmp

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memory/616-1-0x0000000000CE0000-0x0000000000CF8000-memory.dmp

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memory/616-2-0x000007FEF50E0000-0x000007FEF5ACC000-memory.dmp

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memory/616-29-0x000007FEF50E3000-0x000007FEF50E4000-memory.dmp

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memory/616-30-0x000007FEF50E0000-0x000007FEF5ACC000-memory.dmp

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memory/1420-14-0x000000001B6E0000-0x000000001B9C2000-memory.dmp

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memory/1420-15-0x0000000002860000-0x0000000002868000-memory.dmp

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memory/2764-7-0x000000001B660000-0x000000001B942000-memory.dmp

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memory/2764-8-0x0000000002790000-0x0000000002798000-memory.dmp

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memory/2848-34-0x0000000001330000-0x0000000001348000-memory.dmp

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