xworm | fb9073722b486a55008b1707db968521335be77134508be360df166565c466c0

Analysis

max time kernel
148s
max time network
146s
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, 03:20

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General

Target
fff.exe
Size 85KB
Sample240607-dvxsvsgh4y
SHA256 fb9073722b486a55008b1707db968521335be77134508be360df166565c466c0
MD5 2684382f8a483cbfaaef46996bdb8d37
SHA1 192d6382f40a9d5b800b21ee0c705cd8aec39d3d
SHA512 c41a03e09b99b5c2801e0a1925c0b91c435fe92f81ea52ab92781603c373a39c63bb0f5e95eafad25034f377a6edd13dcda6ee3f12feff5466f083f3e0b07ac7
SSDEEP 1536:qMn/CbOlG8rPMQ7b7XloXyh6hj1YKlZ/Oo3k2JxEoH:qMnqKJF7b7XejyK7Oo3VxbH
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

learning-gays.gl.at.ply.gg:8848

Attributes

Install_directory
%AppData%
install_file
XClient.exe

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/memory/4668-0-0x0000000000230000-0x000000000024C000-memory.dmp	family_xworm
behavioral2/files/0x000e0000000233e7-58.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
2308	powershell.exe
4600	powershell.exe
1172	powershell.exe
4460	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-1-5-21-3571316656-3665257725-2415531812-1000\Control Panel\International\Geo\Nation	fff.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 3 IoCs

pid	Process
4320	XClient.exe
4048	XClient.exe
4208	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-1-5-21-3571316656-3665257725-2415531812-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\XClient = "C:\\Users\\Admin\\AppData\\Roaming\\XClient.exe"	fff.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
3904	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
2308	powershell.exe
2308	powershell.exe
4600	powershell.exe
4600	powershell.exe
1172	powershell.exe
1172	powershell.exe
4460	powershell.exe
4460	powershell.exe
4668	fff.exe

Suspicious use of AdjustPrivilegeToken 9 IoCs

description	pid	Process
Token: SeDebugPrivilege	4668	fff.exe
Token: SeDebugPrivilege	2308	powershell.exe
Token: SeDebugPrivilege	4600	powershell.exe
Token: SeDebugPrivilege	1172	powershell.exe
Token: SeDebugPrivilege	4460	powershell.exe
Token: SeDebugPrivilege	4668	fff.exe
Token: SeDebugPrivilege	4320	XClient.exe
Token: SeDebugPrivilege	4048	XClient.exe
Token: SeDebugPrivilege	4208	XClient.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4668	fff.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4668 wrote to memory of 2308	4668	fff.exe	89
PID 4668 wrote to memory of 2308	4668	fff.exe	89
PID 4668 wrote to memory of 4600	4668	fff.exe	92
PID 4668 wrote to memory of 4600	4668	fff.exe	92
PID 4668 wrote to memory of 1172	4668	fff.exe	94
PID 4668 wrote to memory of 1172	4668	fff.exe	94
PID 4668 wrote to memory of 4460	4668	fff.exe	96
PID 4668 wrote to memory of 4460	4668	fff.exe	96
PID 4668 wrote to memory of 3904	4668	fff.exe	99
PID 4668 wrote to memory of 3904	4668	fff.exe	99

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\fff.exe
"C:\Users\Admin\AppData\Local\Temp\fff.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:4668
- 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\fff.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2308
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'fff.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4600
- 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:1172
- 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:4460
- 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:3904

C:\Users\Admin\AppData\Roaming\XClient.exe
C:\Users\Admin\AppData\Roaming\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4320

C:\Users\Admin\AppData\Roaming\XClient.exe
C:\Users\Admin\AppData\Roaming\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4048

C:\Users\Admin\AppData\Roaming\XClient.exe
C:\Users\Admin\AppData\Roaming\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4208

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 986366767de5873f1b170a63f2a33ce05132d1afd90c8f5017afbca8ef1beb05
MD5 3a6bad9528f8e23fb5c77fbd81fa28e8
SHA1 f127317c3bc6407f536c0f0600dcbcf1aabfba36
SHA512 846002154a0ece6f3e9feda6f115d3161dc21b3789525dd62ae1d9188495171293efdbe7be4710666dd8a15e66b557315b5a02918a741ed1d5f3ff0c515b98e2
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 944B
SHA256 08f4e8e6a5ef01871fd729e9ffe39a8dcd8ff757acdb0d8fddee6df6a31040be
MD5 348cb3ce77d0f65a917f98482ef5476e
SHA1 57d0da6d0ba132c7db3d92a374d144eb5fb1aa75
SHA512 84ebd8c00d6f87b478d713c8ed9233c8d3fb7817a1fb65959b04a569ab77a671516408bdc4d60b14caf2283c4bd0d9f2d35d1b2674c41fcf093ad3d584869b5b
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 944B
SHA256 862d25ed22075f3d1f5e8d29a3c6e050dc91e53a4dc653c3f0f7c627a12ee26c
MD5 7a451cd1316d70a65910773fee8c3a43
SHA1 d2db32d5037153dd1d94565b51b5b385817a3c3d
SHA512 60887f795036fbd6d25234c17dab4463a8a02f576ae8c07dd7b4c4ff1dba35f99b7301139ea051a7a80fdfc9e003a2f0c2dd0d444a82ecf87a3df21507332aa6
MD5 SHA1 SHA512

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__PSScriptPolicyTest_ndkxkfyw.cjm.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ndkxkfyw.cjm.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 85KB
SHA256 fb9073722b486a55008b1707db968521335be77134508be360df166565c466c0
MD5 2684382f8a483cbfaaef46996bdb8d37
SHA1 192d6382f40a9d5b800b21ee0c705cd8aec39d3d
SHA512 c41a03e09b99b5c2801e0a1925c0b91c435fe92f81ea52ab92781603c373a39c63bb0f5e95eafad25034f377a6edd13dcda6ee3f12feff5466f083f3e0b07ac7
SSDEEP 1536:qMn/CbOlG8rPMQ7b7XloXyh6hj1YKlZ/Oo3k2JxEoH:qMnqKJF7b7XejyK7Oo3VxbH
MD5 SHA1 SHA512 SSDEEP

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memory/2308-10-0x00007FF8E8B00000-0x00007FF8E95C1000-memory.dmp

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memory/2308-18-0x00007FF8E8B00000-0x00007FF8E95C1000-memory.dmp

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memory/2308-15-0x00007FF8E8B00000-0x00007FF8E95C1000-memory.dmp

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memory/2308-14-0x00007FF8E8B00000-0x00007FF8E95C1000-memory.dmp

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memory/2308-8-0x00000265A8C70000-0x00000265A8C92000-memory.dmp

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memory/4668-0-0x0000000000230000-0x000000000024C000-memory.dmp

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memory/4668-57-0x00007FF8E8B00000-0x00007FF8E95C1000-memory.dmp

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memory/4668-2-0x00007FF8E8B00000-0x00007FF8E95C1000-memory.dmp

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memory/4668-1-0x00007FF8E8B03000-0x00007FF8E8B05000-memory.dmp

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