xworm | c52b1dcc41733a205f4116d7bd9534f5fcf6bfde4b5e0273afbc1b044ffa2bb4

Analysis

max time kernel
141s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
02/06/2024, 14:11

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General

Target
XClient.exe
Size 82KB
Sample240602-rhnlbafb86
SHA256 c52b1dcc41733a205f4116d7bd9534f5fcf6bfde4b5e0273afbc1b044ffa2bb4
MD5 acb3790b97d92fb36fe9add6258c8211
SHA1 1e923c8a00753d61aa57441848b81b3199f9460a
SHA512 b5407b460163c230c8f33a4fd249fede4245e5e260200ce9cacf66f9d1b217b8b0e727ba1fc8622807c0a78c10ad5f2805982a9f0c065c0439906698189b5da3
SSDEEP 1536:0UtNvzNsL8xv1e3dmuM+Ebc8hP4a6X5foOq68dQgp9Zm66:0UbvhlvPhbcZeOq68H9Z36
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/636-1-0x0000000000B50000-0x0000000000B6A000-memory.dmp	family_xworm
behavioral2/files/0x000300000001e32b-62.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
1976	powershell.exe
1052	powershell.exe
1828	powershell.exe
4164	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-1-5-21-3808065738-1666277613-1125846146-1000\Control Panel\International\Geo\Nation	XClient.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 2 IoCs

pid	Process
3348	steamwebhelper.exe
4632	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-1-5-21-3808065738-1666277613-1125846146-1000\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
7	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
2208	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
1052	powershell.exe
1052	powershell.exe
1828	powershell.exe
1828	powershell.exe
4164	powershell.exe
4164	powershell.exe
1976	powershell.exe
1976	powershell.exe
636	XClient.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	636	XClient.exe
Token: SeDebugPrivilege	1052	powershell.exe
Token: SeDebugPrivilege	1828	powershell.exe
Token: SeDebugPrivilege	4164	powershell.exe
Token: SeDebugPrivilege	1976	powershell.exe
Token: SeDebugPrivilege	636	XClient.exe
Token: SeDebugPrivilege	3348	steamwebhelper.exe
Token: SeDebugPrivilege	4632	steamwebhelper.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
636	XClient.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 636 wrote to memory of 1052	636	XClient.exe	92
PID 636 wrote to memory of 1052	636	XClient.exe	92
PID 636 wrote to memory of 1828	636	XClient.exe	94
PID 636 wrote to memory of 1828	636	XClient.exe	94
PID 636 wrote to memory of 4164	636	XClient.exe	96
PID 636 wrote to memory of 4164	636	XClient.exe	96
PID 636 wrote to memory of 1976	636	XClient.exe	98
PID 636 wrote to memory of 1976	636	XClient.exe	98
PID 636 wrote to memory of 2208	636	XClient.exe	100
PID 636 wrote to memory of 2208	636	XClient.exe	100

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:636
- 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:1052
- 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:1828
- 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:4164
- 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:1976
- 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:2208

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=4256 --field-trial-handle=2252,i,16022092570067181109,3235558581947505669,262144 --variations-seed-version /prefetch:8
1⤵
PID:3264

C:\ProgramData\steamwebhelper.exe
C:\ProgramData\steamwebhelper.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3348

C:\ProgramData\steamwebhelper.exe
C:\ProgramData\steamwebhelper.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4632

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 82KB
SHA256 c52b1dcc41733a205f4116d7bd9534f5fcf6bfde4b5e0273afbc1b044ffa2bb4
MD5 acb3790b97d92fb36fe9add6258c8211
SHA1 1e923c8a00753d61aa57441848b81b3199f9460a
SHA512 b5407b460163c230c8f33a4fd249fede4245e5e260200ce9cacf66f9d1b217b8b0e727ba1fc8622807c0a78c10ad5f2805982a9f0c065c0439906698189b5da3
SSDEEP 1536:0UtNvzNsL8xv1e3dmuM+Ebc8hP4a6X5foOq68dQgp9Zm66:0UbvhlvPhbcZeOq68H9Z36
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 cce65b73cdfe9304bcd5207913e8b60fb69faa20cd3b684f2b0343b755b99438
MD5 cadef9abd087803c630df65264a6c81c
SHA1 babbf3636c347c8727c35f3eef2ee643dbcc4bd2
SHA512 7278aa87124abb382d9024a645e881e7b7cf1b84e8894943b36e018dbf0399e6858392f77980b599fa5488e2e21bf757a0702fe6419417edac93b68e0c2ec085
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 944B
SHA256 692ec20c7039170fb199510f0436181fd155e6b4516d4d1c9e1675adf99aaa7f
MD5 ef72c47dbfaae0b9b0d09f22ad4afe20
SHA1 5357f66ba69b89440b99d4273b74221670129338
SHA512 7514b6bc8dc39fa618223300be27cd535dc35b18c66b4a089e2302e72b3e0cac06d88a989fa1296feb386b3cbe2084019df6430c7f895071b76e04ce559a30b4
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 944B
SHA256 c88e4bbb64f7fa31429ebe82c1cf07785c44486f37576f783a26ac856e02a4eb
MD5 9bc110200117a3752313ca2acaf8a9e1
SHA1 fda6b7da2e7b0175b391475ca78d1b4cf2147cd3
SHA512 1f1af32aa18a8cbfcc65b0d4fb7e6ca2705f125eaa85789e981ee68b90c64522e954825abf460d4b4f97567715dfae8d9b0a25a4d54d10bc4c257c472f2e80fb
MD5 SHA1 SHA512

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__PSScriptPolicyTest_25df2yav.if5.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_25df2yav.if5.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
MD5 SHA1 SHA512

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memory/636-0-0x00007FFAE92C3000-0x00007FFAE92C5000-memory.dmp

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memory/636-59-0x00007FFAE92C3000-0x00007FFAE92C5000-memory.dmp

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memory/636-60-0x00007FFAE92C0000-0x00007FFAE9D81000-memory.dmp

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memory/636-2-0x00007FFAE92C0000-0x00007FFAE9D81000-memory.dmp

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memory/636-1-0x0000000000B50000-0x0000000000B6A000-memory.dmp

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memory/1052-15-0x00007FFAE92C0000-0x00007FFAE9D81000-memory.dmp

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memory/1052-16-0x00007FFAE92C0000-0x00007FFAE9D81000-memory.dmp

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memory/1052-17-0x00007FFAE92C0000-0x00007FFAE9D81000-memory.dmp

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memory/1052-20-0x00007FFAE92C0000-0x00007FFAE9D81000-memory.dmp

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memory/1052-14-0x00007FFAE92C0000-0x00007FFAE9D81000-memory.dmp

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memory/1052-12-0x000001DC558A0000-0x000001DC558C2000-memory.dmp

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memory/1052-3-0x00007FFAE92C0000-0x00007FFAE9D81000-memory.dmp

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