xworm | 63730a732cf8a13d267b0c5dccf0dd9f5e3a5c19cbc67bc21d59fdeba3d9e17f

Analysis

max time kernel
142s
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
07/06/2024, 20:02

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General

Target
XClient.exe
Size 89KB
Sample240607-yslyssce8w
SHA256 63730a732cf8a13d267b0c5dccf0dd9f5e3a5c19cbc67bc21d59fdeba3d9e17f
MD5 38ab80e3bbf046b09c72dd4006b24213
SHA1 62bc0fa39fb1967b388b99e279cdd63071f7e8c1
SHA512 2abaaf6a12928237e2d89d9bade332d4e05db7bc802547880f326bcf146e19e627612aede179bc3925f48149a8bb4fd024c38da64899f602961887326eabb223
SSDEEP 1536:s7QZY84wzRU4OXAN3YwVCF7yFmqGFWbpiRjtlNHsk6YUKOA9y4KV4L:scZY8HEw22CfqtbpYtNUKOA91L
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

127.0.0.1:13678:33365
192.168.100.78:33365

Attributes

Install_directory
%AppData%
install_file
XClient.exe

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/memory/400-0-0x0000000000B40000-0x0000000000B5C000-memory.dmp	family_xworm
behavioral2/files/0x000b000000023400-59.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
2660	powershell.exe
3424	powershell.exe
3236	powershell.exe
4692	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-1-5-21-711569230-3659488422-571408806-1000\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 2 IoCs

pid	Process
1252	XClient.exe
2096	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-1-5-21-711569230-3659488422-571408806-1000\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
14	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
4172	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
3236	powershell.exe
3236	powershell.exe
4692	powershell.exe
4692	powershell.exe
2660	powershell.exe
2660	powershell.exe
3424	powershell.exe
3424	powershell.exe
400	XClient.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	400	XClient.exe
Token: SeDebugPrivilege	3236	powershell.exe
Token: SeDebugPrivilege	4692	powershell.exe
Token: SeDebugPrivilege	2660	powershell.exe
Token: SeDebugPrivilege	3424	powershell.exe
Token: SeDebugPrivilege	400	XClient.exe
Token: SeDebugPrivilege	1252	XClient.exe
Token: SeDebugPrivilege	2096	XClient.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
400	XClient.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 400 wrote to memory of 3236	400	XClient.exe	84
PID 400 wrote to memory of 3236	400	XClient.exe	84
PID 400 wrote to memory of 4692	400	XClient.exe	87
PID 400 wrote to memory of 4692	400	XClient.exe	87
PID 400 wrote to memory of 2660	400	XClient.exe	89
PID 400 wrote to memory of 2660	400	XClient.exe	89
PID 400 wrote to memory of 3424	400	XClient.exe	91
PID 400 wrote to memory of 3424	400	XClient.exe	91
PID 400 wrote to memory of 4172	400	XClient.exe	93
PID 400 wrote to memory of 4172	400	XClient.exe	93

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:400
- 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:3236
- 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:4692
- 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:2660
- 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:3424
- 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:4172

C:\Users\Admin\AppData\Roaming\XClient.exe
C:\Users\Admin\AppData\Roaming\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1252

C:\Users\Admin\AppData\Roaming\XClient.exe
C:\Users\Admin\AppData\Roaming\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2096

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 f97ff12a8abf4bf88bb6497bd2ac2da12628c8847a8ba5a9026bdbb76507cdfb
MD5 77d622bb1a5b250869a3238b9bc1402b
SHA1 d47f4003c2554b9dfc4c16f22460b331886b191b
SHA512 d6789b5499f23c9035375a102271e17a8a82e57d6f5312fa24242e08a83efdeb8becb7622f55c4cf1b89c7d864b445df11f4d994cf7e2f87a900535bcca12fd9
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 944B
SHA256 d6fa39eab7ee36f44dc3f9f2839d098433db95c1eba924e4bcf4e5c0d268d961
MD5 15dde0683cd1ca19785d7262f554ba93
SHA1 d039c577e438546d10ac64837b05da480d06bf69
SHA512 57c0e1b87bc1c136f0d39f3ce64bb8f8274a0491e4ca6e45e5c7f9070aa9d9370c6f590ce37cd600b252df2638d870205249a514c43245ca7ed49017024a4672
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 944B
SHA256 09c7a01be4b672d54b8926b3acf5e17d7fb1337c6c05fb256325422d30673110
MD5 8896ea98227bfc7787e3af086b14164f
SHA1 3adf11ebaa4057529629c64d5628a11b6a6adc5f
SHA512 2ac7489c408a7ff6afc279f08ea2d0fa531ff6d0d7086951d7819ea7d2eb79f2d1e71a56086b45280246f6b60be4193a6684bd137df1dba7337a164cf8d21d5a
MD5 SHA1 SHA512

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__PSScriptPolicyTest_fbr1uvbn.114.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_fbr1uvbn.114.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 89KB
SHA256 63730a732cf8a13d267b0c5dccf0dd9f5e3a5c19cbc67bc21d59fdeba3d9e17f
MD5 38ab80e3bbf046b09c72dd4006b24213
SHA1 62bc0fa39fb1967b388b99e279cdd63071f7e8c1
SHA512 2abaaf6a12928237e2d89d9bade332d4e05db7bc802547880f326bcf146e19e627612aede179bc3925f48149a8bb4fd024c38da64899f602961887326eabb223
SSDEEP 1536:s7QZY84wzRU4OXAN3YwVCF7yFmqGFWbpiRjtlNHsk6YUKOA9y4KV4L:scZY8HEw22CfqtbpYtNUKOA91L
MD5 SHA1 SHA512 SSDEEP

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memory/400-1-0x00007FFD8DBE3000-0x00007FFD8DBE5000-memory.dmp

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memory/400-2-0x00007FFD8DBE0000-0x00007FFD8E6A1000-memory.dmp

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memory/400-0-0x0000000000B40000-0x0000000000B5C000-memory.dmp

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memory/400-58-0x00007FFD8DBE0000-0x00007FFD8E6A1000-memory.dmp

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memory/400-57-0x00007FFD8DBE3000-0x00007FFD8DBE5000-memory.dmp

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memory/3236-9-0x0000025E610A0000-0x0000025E610C2000-memory.dmp

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memory/3236-18-0x00007FFD8DBE0000-0x00007FFD8E6A1000-memory.dmp

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memory/3236-15-0x00007FFD8DBE0000-0x00007FFD8E6A1000-memory.dmp

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memory/3236-10-0x00007FFD8DBE0000-0x00007FFD8E6A1000-memory.dmp

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memory/3236-3-0x00007FFD8DBE0000-0x00007FFD8E6A1000-memory.dmp

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