xworm | 9ee2b4dfcae8b6e7681dc6691ffd4dcfb521d061188b805e4c09f4151bbb9674

Reason

Machine shutdown

General

Target

XClient.exe
Size

67KB
MD5

51c54850a03f6858fe61e195110f33d9
SHA1

6e804a790b2b9a63f02d756a963fb76472d789cf
SHA256

9ee2b4dfcae8b6e7681dc6691ffd4dcfb521d061188b805e4c09f4151bbb9674
SHA512

642e969c5dc7165cf63dda7423ea42042878949909e860a73fabeb1bd9b2083fe026a705eb94be99fc68f691f4ca0a3ed820037afb2a35323e628b52941ec16c
SSDEEP

1536:60UL9WC16LIK6u/VO2kbP8cnnSVzS06H3OCIDO495:HULOLXA2kbP8MO/C495

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Attributes

Install_directory
%AppData%
install_file
Sihost.exe
pastebin_url
https://pastebin.com/raw/hA5YVNf1

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral2/memory/1492-1-0x0000000000520000-0x0000000000538000-memory.dmp	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm
Xworm family
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
4920	powershell.exe
3936	powershell.exe
3504	powershell.exe
2220	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-1-5-21-3181990009-820930284-137514597-1000\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\Sihost.lnk	XClient.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Sihost.lnk	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-1-5-21-3181990009-820930284-137514597-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Sihost = "C:\\Users\\Admin\\AppData\\Roaming\\Sihost.exe"	XClient.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
28	pastebin.com
29	pastebin.com

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Modifies data under HKEY_USERS 15 IoCs

description	ioc	Process
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History\AutoColor = "0"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "1"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "19"	LogonUI.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = a6d8ff0076b9ed00429ce3000078d700005a9e000042750000264200f7630c00	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\StartColorMenu = "4288567808"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentColorMenu = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\AccentColor = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10"	LogonUI.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
5064	schtasks.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
4920	powershell.exe
4920	powershell.exe
3936	powershell.exe
3936	powershell.exe
3504	powershell.exe
3504	powershell.exe
2220	powershell.exe
2220	powershell.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	1492	XClient.exe
Token: SeDebugPrivilege	4920	powershell.exe
Token: SeDebugPrivilege	3936	powershell.exe
Token: SeDebugPrivilege	3504	powershell.exe
Token: SeDebugPrivilege	2220	powershell.exe
Token: SeDebugPrivilege	1492	XClient.exe
Token: SeShutdownPrivilege	112	shutdown.exe
Token: SeRemoteShutdownPrivilege	112	shutdown.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4752	LogonUI.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 1492 wrote to memory of 4920	1492	XClient.exe	93
PID 1492 wrote to memory of 4920	1492	XClient.exe	93
PID 1492 wrote to memory of 3936	1492	XClient.exe	95
PID 1492 wrote to memory of 3936	1492	XClient.exe	95
PID 1492 wrote to memory of 3504	1492	XClient.exe	98
PID 1492 wrote to memory of 3504	1492	XClient.exe	98
PID 1492 wrote to memory of 2220	1492	XClient.exe	100
PID 1492 wrote to memory of 2220	1492	XClient.exe	100
PID 1492 wrote to memory of 5064	1492	XClient.exe	102
PID 1492 wrote to memory of 5064	1492	XClient.exe	102
PID 1492 wrote to memory of 112	1492	XClient.exe	106
PID 1492 wrote to memory of 112	1492	XClient.exe	106

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 use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1492
- 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:4920
- 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:3936
- 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\Sihost.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3504
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Sihost.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2220
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "Sihost" /tr "C:\Users\Admin\AppData\Roaming\Sihost.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:5064
- C:\Windows\SYSTEM32\shutdown.exe
  shutdown.exe /f /s /t 0
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:112

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x4 /state0:0xa395f055 /state1:0x41c64e6d
1⤵
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:4752

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
77d622bb1a5b250869a3238b9bc1402b

SHA1
d47f4003c2554b9dfc4c16f22460b331886b191b

SHA256
f97ff12a8abf4bf88bb6497bd2ac2da12628c8847a8ba5a9026bdbb76507cdfb

SHA512
d6789b5499f23c9035375a102271e17a8a82e57d6f5312fa24242e08a83efdeb8becb7622f55c4cf1b89c7d864b445df11f4d994cf7e2f87a900535bcca12fd9

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
efea9c0b17efd9fa2d320964b3e2d726

SHA1
e1ea97c1746121ce43df1f8444a432aa76da9664

SHA256
6f987297987dd27474ba14992442ae6760fc01e0eb59191efde7b2b92617d256

SHA512
7c286118a1f504379b3ec7ae74d9948a10c38213dc881b5e9a2b052957d478aeb9d48ee1ee38d6ee46b85db4039890a024a4ac5ed0da212ed005ee678702a8dc

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
e58749a7a1826f6ea62df1e2ef63a32b

SHA1
c0bca21658b8be4f37b71eec9578bfefa44f862d

SHA256
0e1f0e684adb40a5d0668df5fed007c9046137d7ae16a1f2f343b139d5f9bc93

SHA512
4cf45b2b11ab31e7f67fff286b29d50ed28cd6043091144c5c0f1348b5f5916ed7479cf985595e6f096b586ab93b4b5dce612f688049b8366a2dd91863e98b70

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_h5fptix5.qzk.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1492-1-0x0000000000520000-0x0000000000538000-memory.dmp

Filesize
96KB

Download
memory/1492-0-0x00007FFD99A03000-0x00007FFD99A05000-memory.dmp

Filesize
8KB

Download
memory/1492-58-0x00007FFD99A00000-0x00007FFD9A4C1000-memory.dmp

Filesize
10.8MB

Download
memory/1492-57-0x00007FFD99A00000-0x00007FFD9A4C1000-memory.dmp

Filesize
10.8MB

Download
memory/1492-56-0x00007FFD99A00000-0x00007FFD9A4C1000-memory.dmp

Filesize
10.8MB

Download
memory/4920-11-0x000002A2DD780000-0x000002A2DD7A2000-memory.dmp

Filesize
136KB

Download
memory/4920-17-0x00007FFD99A00000-0x00007FFD9A4C1000-memory.dmp

Filesize
10.8MB

Download
memory/4920-14-0x00007FFD99A00000-0x00007FFD9A4C1000-memory.dmp

Filesize
10.8MB

Download
memory/4920-13-0x00007FFD99A00000-0x00007FFD9A4C1000-memory.dmp

Filesize
10.8MB

Download
memory/4920-12-0x00007FFD99A00000-0x00007FFD9A4C1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

Errors

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads