xworm | 4801097be6fcec7253afab46b3eeb228d1fd42bb80bca2d9f7ecf12555cb6959

Analysis

max time kernel
148s
max time network
124s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
04/06/2024, 15:33

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General

Target
XClient.exe
Size 177KB
Sample240604-szev6scc44
SHA256 4801097be6fcec7253afab46b3eeb228d1fd42bb80bca2d9f7ecf12555cb6959
MD5 d2bd07b9fe1c522cf1ab7089dc886a8e
SHA1 c7a5916c3102f6ec9573cffa2214ce58657cde05
SHA512 cf8f2884fe66a32ab8aee760ec131caa2a2548d4231b6e6bf9bebe02dcc2447d840ab3afcb027ce3d7783d755285378a2ccbbeaa3c0fd9bda7151fe24d420699
SSDEEP 3072:cCU2vibdmayxfkOY/ZZJBz65/M6If+3Js+3JFkKeTno:HU2vibd4ojJxBt25
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Version

127.0.0.1:80

Attributes

Install_directory
%AppData%
install_file
USB.exe

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/memory/3568-1-0x0000000000210000-0x0000000000242000-memory.dmp	family_xworm
behavioral2/files/0x000a00000002338b-48.dat	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
1496	powershell.exe
4696	powershell.exe
3144	powershell.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-4124900551-4068476067-3491212533-1000\Control Panel\International\Geo\Nation	XClient.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 3 IoCs

pid	Process
4240	XClient.exe
4032	XClient.exe
3032	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-1-5-21-4124900551-4068476067-3491212533-1000\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
29	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
3856	schtasks.exe

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
1496	powershell.exe
1496	powershell.exe
4696	powershell.exe
4696	powershell.exe
3144	powershell.exe
3144	powershell.exe
3568	XClient.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	3568	XClient.exe
Token: SeDebugPrivilege	1496	powershell.exe
Token: SeDebugPrivilege	4696	powershell.exe
Token: SeDebugPrivilege	3144	powershell.exe
Token: SeDebugPrivilege	3568	XClient.exe
Token: SeDebugPrivilege	4240	XClient.exe
Token: SeDebugPrivilege	4032	XClient.exe
Token: SeDebugPrivilege	3032	XClient.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3568	XClient.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 3568 wrote to memory of 1496	3568	XClient.exe	94
PID 3568 wrote to memory of 1496	3568	XClient.exe	94
PID 3568 wrote to memory of 4696	3568	XClient.exe	96
PID 3568 wrote to memory of 4696	3568	XClient.exe	96
PID 3568 wrote to memory of 3144	3568	XClient.exe	98
PID 3568 wrote to memory of 3144	3568	XClient.exe	98
PID 3568 wrote to memory of 3856	3568	XClient.exe	101
PID 3568 wrote to memory of 3856	3568	XClient.exe	101

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⤵
- Checks computer location settings
- 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:3568
- 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:1496
- 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:4696
- 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:3144
- 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:3856

C:\Users\Admin\AppData\Roaming\XClient.exe
C:\Users\Admin\AppData\Roaming\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4240

C:\Users\Admin\AppData\Roaming\XClient.exe
C:\Users\Admin\AppData\Roaming\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4032

C:\Users\Admin\AppData\Roaming\XClient.exe
C:\Users\Admin\AppData\Roaming\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3032

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

XClient.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\XClient.exe.log
Size 654B
SHA256 e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced
MD5 2ff39f6c7249774be85fd60a8f9a245e
SHA1 684ff36b31aedc1e587c8496c02722c6698c1c4e
SHA512 1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1
MD5 SHA1 SHA512

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powershell.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log
Size 2KB
SHA256 84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f
MD5 d85ba6ff808d9e5444a4b369f5bc2730
SHA1 31aa9d96590fff6981b315e0b391b575e4c0804a
SHA512 8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 944B
SHA256 95d79fd575bbd21540e378fcbc1cd00d16f51af62ce15bae7080bb72c24e2010
MD5 62623d22bd9e037191765d5083ce16a3
SHA1 4a07da6872672f715a4780513d95ed8ddeefd259
SHA512 9a448b7a0d867466c2ea04ab84d2a9485d5fd20ab53b2b854f491831ee3f1d781b94d2635f7b0b35cb9f2d373cd52c67570879a56a42ed66bc9db06962ed4992
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 944B
SHA256 adad192fc86c2f939fd3f70cb9ad323139a4e100f7c90b4454e2c53bdbc9b705
MD5 b1a1d8b05525b7b0c5babfd80488c1f2
SHA1 c85bbd6b7d0143676916c20fd52720499c2bb5c6
SHA512 346c6513c1373bab58439e37d3f75de1c5c587d7eb27076cf696e885a027b3b38d70b585839d1a2e7f2270cdcf0dac8c1fdff799f3b1158242ae9e3364c2a06e
MD5 SHA1 SHA512

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__PSScriptPolicyTest_zsnspjiw.fsz.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_zsnspjiw.fsz.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
MD5 SHA1 SHA512

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XClient.exe

Path C:\Users\Admin\AppData\Roaming\XClient.exe
Size 177KB
SHA256 4801097be6fcec7253afab46b3eeb228d1fd42bb80bca2d9f7ecf12555cb6959
MD5 d2bd07b9fe1c522cf1ab7089dc886a8e
SHA1 c7a5916c3102f6ec9573cffa2214ce58657cde05
SHA512 cf8f2884fe66a32ab8aee760ec131caa2a2548d4231b6e6bf9bebe02dcc2447d840ab3afcb027ce3d7783d755285378a2ccbbeaa3c0fd9bda7151fe24d420699
SSDEEP 3072:cCU2vibdmayxfkOY/ZZJBz65/M6If+3Js+3JFkKeTno:HU2vibd4ojJxBt25
MD5 SHA1 SHA512 SSDEEP

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memory/1496-4-0x00007FFAC0F20000-0x00007FFAC19E1000-memory.dmp

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memory/1496-11-0x000002747FDB0000-0x000002747FDD2000-memory.dmp

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memory/1496-18-0x00007FFAC0F20000-0x00007FFAC19E1000-memory.dmp

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memory/1496-5-0x00007FFAC0F20000-0x00007FFAC19E1000-memory.dmp

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memory/1496-3-0x00007FFAC0F20000-0x00007FFAC19E1000-memory.dmp

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memory/3568-0-0x00007FFAC0F23000-0x00007FFAC0F25000-memory.dmp

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memory/3568-2-0x00007FFAC0F20000-0x00007FFAC19E1000-memory.dmp

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memory/3568-50-0x00007FFAC0F23000-0x00007FFAC0F25000-memory.dmp

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memory/3568-51-0x00007FFAC0F20000-0x00007FFAC19E1000-memory.dmp

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memory/3568-1-0x0000000000210000-0x0000000000242000-memory.dmp

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