xworm | 8e6a1ef0257f98ada6c7eb9425d0211dced8368795613771998bd3bd510ac1e1

Analysis

max time kernel
147s
max time network
152s
platform
windows11-21h2_x64
resource
win11-20240419-en
resource tags

arch:x64arch:x86image:win11-20240419-enlocale:en-usos:windows11-21h2-x64system
submitted
04/06/2024, 15:52

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General

Target
XClient.exe
Size 71KB
Sample240604-tbkxyscf65
SHA256 8e6a1ef0257f98ada6c7eb9425d0211dced8368795613771998bd3bd510ac1e1
MD5 1dd48d185245b889afabab3648238dbb
SHA1 d0d3f8ca8ddf3f8770690d84195e6bee49cb3623
SHA512 96315d58f8878230e9fd195008fa96e5883673bcd832bea6ba842f104495bdc19e8317d9673153cd68b2db8bfec4237324e1265a27fcf1ba9cba7ebcd4db1041
SSDEEP 1536:zzXdgEmYWm8eYBPz+tbdE6hu66YnCJO7w0tf7qqzL:3ootbdCbOU09vL
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Version

ayumi-27013.portmap.host:27013

Attributes

Install_directory
%AppData%
install_file
USB.exe

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral4/memory/1800-1-0x0000000000210000-0x0000000000228000-memory.dmp	family_xworm
behavioral4/files/0x002100000002ab09-47.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
1460	powershell.exe
4552	powershell.exe
1548	powershell.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
4592	XClient.exe
5092	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-1-5-21-1474490143-3221292397-4168103503-1000\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
1	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
2344	schtasks.exe

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
1460	powershell.exe
1460	powershell.exe
4552	powershell.exe
4552	powershell.exe
1548	powershell.exe
1548	powershell.exe
1800	XClient.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	1800	XClient.exe
Token: SeDebugPrivilege	1460	powershell.exe
Token: SeDebugPrivilege	4552	powershell.exe
Token: SeDebugPrivilege	1548	powershell.exe
Token: SeDebugPrivilege	1800	XClient.exe
Token: SeDebugPrivilege	4592	XClient.exe
Token: SeDebugPrivilege	5092	XClient.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1800	XClient.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1800 wrote to memory of 1460	1800	XClient.exe	81
PID 1800 wrote to memory of 1460	1800	XClient.exe	81
PID 1800 wrote to memory of 4552	1800	XClient.exe	83
PID 1800 wrote to memory of 4552	1800	XClient.exe	83
PID 1800 wrote to memory of 1548	1800	XClient.exe	85
PID 1800 wrote to memory of 1548	1800	XClient.exe	85
PID 1800 wrote to memory of 2344	1800	XClient.exe	87
PID 1800 wrote to memory of 2344	1800	XClient.exe	87

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⤵
- 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:1800
- 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:1460
- 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:4552
- 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:1548
- 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:2344

C:\Users\Admin\AppData\Roaming\XClient.exe
C:\Users\Admin\AppData\Roaming\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4592

C:\Users\Admin\AppData\Roaming\XClient.exe
C:\Users\Admin\AppData\Roaming\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:5092

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 e31b18f21621d9983bfdf1ea3e53884a9d58b8ffd79e0e5790da6f3a81a8b9d3
MD5 2cbbb74b7da1f720b48ed31085cbd5b8
SHA1 79caa9a3ea8abe1b9c4326c3633da64a5f724964
SHA512 ecf02d5240e0c1c005d3ab393aa7eff62bd498c2db5905157e2bf6d29e1b663228a9583950842629d1a4caef404c8941a0c7799b1a3bd1eb890a09fdb7efcff9
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 85b280a39fc31ba1e15fb06102a05b8405ff3b82feb181d4170f04e466dd647c
MD5 627073ee3ca9676911bee35548eff2b8
SHA1 4c4b68c65e2cab9864b51167d710aa29ebdcff2e
SHA512 3c5f6c03e253b83c57e8d6f0334187dbdcdf4fa549eecd36cbc1322dca6d3ca891dc6a019c49ec2eafb88f82d0434299c31e4dfaab123acb42e0546218f311fb
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 944B
SHA256 96bfd9dd5883329927fe8c08b8956355a1a6ceb30ceeb5d4252b346df32bc864
MD5 2e8eb51096d6f6781456fef7df731d97
SHA1 ec2aaf851a618fb43c3d040a13a71997c25bda43
SHA512 0a73dc9a49f92d9dd556c2ca2e36761890b3538f355ee1f013e7cf648d8c4d065f28046cd4a167db3dea304d1fbcbcea68d11ce6e12a3f20f8b6c018a60422d2
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 944B
SHA256 c51a52818a084addbfa913d2bb4bb2b0e60c287a4cf98e679f18b8a521c0aa7b
MD5 f8c40f7624e23fa92ae2f41e34cfca77
SHA1 20e742cfe2759ac2adbc16db736a9e143ca7b677
SHA512 f1da3ec61403d788d417d097a7ed2947203c6bff3cf1d35d697c31edecdf04710b3e44b2aa263b886e297b2ce923fea410ccc673261928f1d0cd81252740dbe7
MD5 SHA1 SHA512

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__PSScriptPolicyTest_hnxojpb4.ysc.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_hnxojpb4.ysc.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 71KB
SHA256 8e6a1ef0257f98ada6c7eb9425d0211dced8368795613771998bd3bd510ac1e1
MD5 1dd48d185245b889afabab3648238dbb
SHA1 d0d3f8ca8ddf3f8770690d84195e6bee49cb3623
SHA512 96315d58f8878230e9fd195008fa96e5883673bcd832bea6ba842f104495bdc19e8317d9673153cd68b2db8bfec4237324e1265a27fcf1ba9cba7ebcd4db1041
SSDEEP 1536:zzXdgEmYWm8eYBPz+tbdE6hu66YnCJO7w0tf7qqzL:3ootbdCbOU09vL
MD5 SHA1 SHA512 SSDEEP

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memory/1460-4-0x00007FF830B90000-0x00007FF831652000-memory.dmp

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memory/1460-14-0x0000017CE91B0000-0x0000017CE91D2000-memory.dmp

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memory/1460-15-0x00007FF830B90000-0x00007FF831652000-memory.dmp

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memory/1460-18-0x00007FF830B90000-0x00007FF831652000-memory.dmp

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memory/1460-19-0x00007FF830B90000-0x00007FF831652000-memory.dmp

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memory/1460-5-0x00007FF830B90000-0x00007FF831652000-memory.dmp

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memory/1460-3-0x00007FF830B90000-0x00007FF831652000-memory.dmp

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memory/1800-0-0x00007FF830B93000-0x00007FF830B95000-memory.dmp

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memory/1800-2-0x00007FF830B90000-0x00007FF831652000-memory.dmp

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memory/1800-49-0x00007FF830B93000-0x00007FF830B95000-memory.dmp

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memory/1800-50-0x00007FF830B90000-0x00007FF831652000-memory.dmp

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memory/1800-1-0x0000000000210000-0x0000000000228000-memory.dmp

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