xworm | 5a98f494a61679ec1d7e1620c5bd881282d980544a258fa6f3a44bd3ef6ac098

Analysis

max time kernel
149s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
04/06/2024, 22:17

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General

Target
XClient.exe
Size 68KB
Sample240604-17d8lsdc9t
SHA256 5a98f494a61679ec1d7e1620c5bd881282d980544a258fa6f3a44bd3ef6ac098
MD5 fc707c8a839c6e530b81f42be81f591d
SHA1 c42a95ba2e8a2e54d18a9901b143d156f43315f1
SHA512 fd0165777a97731d8249d93d18caf36ed6638e4200007c44e4cb335c2aeb1a4dc698fba35013f3978753c9fca35b83d1714a24608323f5bf6601e8c5b1c87ad9
SSDEEP 1536:s3c3vD37jmTvHTMcd71c5biEOkjJ6jOUXGu:IKv6DTMcLc5biAMOUWu
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

127.0.0.1:7489
related-star.gl.at.ply.gg:7489

Attributes

Install_directory
%ProgramData%
install_file
steamwebhelper.exe

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/memory/4168-1-0x0000000000010000-0x0000000000028000-memory.dmp	family_xworm
behavioral2/files/0x000d00000002343c-59.dat	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
2460	powershell.exe
4924	powershell.exe
3620	powershell.exe
1776	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-1-5-21-4018855536-2201274732-320770143-1000\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\steamwebhelper.lnk	XClient.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\steamwebhelper.lnk	XClient.exe

Executes dropped EXE 2 IoCs

pid	Process
4420	steamwebhelper.exe
2960	steamwebhelper.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-1-5-21-4018855536-2201274732-320770143-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\steamwebhelper = "C:\\ProgramData\\steamwebhelper.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
13	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
4820	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
2460	powershell.exe
2460	powershell.exe
4924	powershell.exe
4924	powershell.exe
3620	powershell.exe
3620	powershell.exe
1776	powershell.exe
1776	powershell.exe
4168	XClient.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	4168	XClient.exe
Token: SeDebugPrivilege	2460	powershell.exe
Token: SeDebugPrivilege	4924	powershell.exe
Token: SeDebugPrivilege	3620	powershell.exe
Token: SeDebugPrivilege	1776	powershell.exe
Token: SeDebugPrivilege	4168	XClient.exe
Token: SeDebugPrivilege	4420	steamwebhelper.exe
Token: SeDebugPrivilege	2960	steamwebhelper.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4168	XClient.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4168 wrote to memory of 2460	4168	XClient.exe	87
PID 4168 wrote to memory of 2460	4168	XClient.exe	87
PID 4168 wrote to memory of 4924	4168	XClient.exe	89
PID 4168 wrote to memory of 4924	4168	XClient.exe	89
PID 4168 wrote to memory of 3620	4168	XClient.exe	93
PID 4168 wrote to memory of 3620	4168	XClient.exe	93
PID 4168 wrote to memory of 1776	4168	XClient.exe	95
PID 4168 wrote to memory of 1776	4168	XClient.exe	95
PID 4168 wrote to memory of 4820	4168	XClient.exe	98
PID 4168 wrote to memory of 4820	4168	XClient.exe	98

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:4168
- 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:2460
- 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:4924
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\ProgramData\steamwebhelper.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3620
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'steamwebhelper.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1776
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "steamwebhelper" /tr "C:\ProgramData\steamwebhelper.exe"
  2⤵
  - Creates scheduled task(s)
  PID:4820

C:\ProgramData\steamwebhelper.exe
C:\ProgramData\steamwebhelper.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4420

C:\ProgramData\steamwebhelper.exe
C:\ProgramData\steamwebhelper.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2960

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

steamwebhelper.exe

Path C:\ProgramData\steamwebhelper.exe
Size 68KB
SHA256 5a98f494a61679ec1d7e1620c5bd881282d980544a258fa6f3a44bd3ef6ac098
MD5 fc707c8a839c6e530b81f42be81f591d
SHA1 c42a95ba2e8a2e54d18a9901b143d156f43315f1
SHA512 fd0165777a97731d8249d93d18caf36ed6638e4200007c44e4cb335c2aeb1a4dc698fba35013f3978753c9fca35b83d1714a24608323f5bf6601e8c5b1c87ad9
SSDEEP 1536:s3c3vD37jmTvHTMcd71c5biEOkjJ6jOUXGu:IKv6DTMcLc5biAMOUWu
MD5 SHA1 SHA512 SSDEEP

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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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steamwebhelper.exe.log

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

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 944B
SHA256 2360634e63e8f0b5748e2c56ebb8f4aa78e71008ea7b5c9ca1c49be03b49557d
MD5 6d3e9c29fe44e90aae6ed30ccf799ca8
SHA1 c7974ef72264bbdf13a2793ccf1aed11bc565dce
SHA512 60c38c4367352537545d859f64b9c5cbada94240478d1d039fd27b5ecba4dc1c90051557c16d802269703b873546ead416279c0a80c6fd5e49ad361cef22596a
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 944B
SHA256 0f9a4b52e01cb051052228a55d0515911b7ef5a8db3cf925528c746df511424d
MD5 34f595487e6bfd1d11c7de88ee50356a
SHA1 4caad088c15766cc0fa1f42009260e9a02f953bb
SHA512 10976c5deaf9fac449e703e852c3b08d099f430de2d7c7b8e2525c35d63e28b890e5aab63feff9b20bca0aaf9f35a3ba411aee3fbeee9ea59f90ed25bd617a0b
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 944B
SHA256 5ef1421e19fde4bc03cd825dd7d6c0e7863f85fd8f0aa4a4d4f8d555dc7606d1
MD5 ba169f4dcbbf147fe78ef0061a95e83b
SHA1 92a571a6eef49fff666e0f62a3545bcd1cdcda67
SHA512 8d2e5e552210dcda684682538bc964fdd8a8ff5b24cc2cc8af813729f0202191f98eb42d38d2355df17ae620fe401aad6ceaedaed3b112fdacd32485a3a0c07c
MD5 SHA1 SHA512

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__PSScriptPolicyTest_tpmkc3be.kot.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_tpmkc3be.kot.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
MD5 SHA1 SHA512

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memory/2460-12-0x00000257F57A0000-0x00000257F57C2000-memory.dmp

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memory/2460-18-0x00007FFC73A80000-0x00007FFC74541000-memory.dmp

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memory/2460-15-0x00007FFC73A80000-0x00007FFC74541000-memory.dmp

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memory/2460-14-0x00007FFC73A80000-0x00007FFC74541000-memory.dmp

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memory/2460-13-0x00007FFC73A80000-0x00007FFC74541000-memory.dmp

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memory/4168-0-0x00007FFC73A83000-0x00007FFC73A85000-memory.dmp

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memory/4168-57-0x00007FFC73A83000-0x00007FFC73A85000-memory.dmp

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memory/4168-58-0x00007FFC73A80000-0x00007FFC74541000-memory.dmp

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memory/4168-2-0x00007FFC73A80000-0x00007FFC74541000-memory.dmp

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memory/4168-1-0x0000000000010000-0x0000000000028000-memory.dmp

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