xworm | 9ee2b4dfcae8b6e7681dc6691ffd4dcfb521d061188b805e4c09f4151bbb9674

General

Target

VNPT7_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 2 IoCs

resource	yara_rule
behavioral2/memory/2236-1-0x0000000000300000-0x0000000000318000-memory.dmp	family_xworm
behavioral2/files/0x000c00000001e6db-59.dat	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
1536	powershell.exe
2192	powershell.exe
4040	powershell.exe
3788	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-1-5-21-925314154-1797147466-1467878628-1000\Control Panel\International\Geo\Nation	VNPT7_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	VNPT7_XClient.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Sihost.lnk	VNPT7_XClient.exe

Executes dropped EXE 2 IoCs

pid	Process
1388	Sihost.exe
3212	Sihost.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-1-5-21-925314154-1797147466-1467878628-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Sihost = "C:\\Users\\Admin\\AppData\\Roaming\\Sihost.exe"	VNPT7_XClient.exe

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

Web Service

T1102

flow	ioc
31	pastebin.com
32	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\CurrentVersion\Explorer\Accent\StartColorMenu = "4288567808"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "213"	LogonUI.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = a6d8ff0076b9ed00429ce3000078d700005a9e000042750000264200f7630c00	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\ColorizationColorBalance = "89"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "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\DWM\ColorizationColor = "3288365271"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History	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\ColorizationAfterglow = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1"	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
3340	schtasks.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
1536	powershell.exe
1536	powershell.exe
2192	powershell.exe
2192	powershell.exe
4040	powershell.exe
4040	powershell.exe
3788	powershell.exe
3788	powershell.exe

Suspicious use of AdjustPrivilegeToken 10 IoCs

description	pid	Process
Token: SeDebugPrivilege	2236	VNPT7_XClient.exe
Token: SeDebugPrivilege	1536	powershell.exe
Token: SeDebugPrivilege	2192	powershell.exe
Token: SeDebugPrivilege	4040	powershell.exe
Token: SeDebugPrivilege	3788	powershell.exe
Token: SeDebugPrivilege	2236	VNPT7_XClient.exe
Token: SeDebugPrivilege	1388	Sihost.exe
Token: SeDebugPrivilege	3212	Sihost.exe
Token: SeShutdownPrivilege	2868	shutdown.exe
Token: SeRemoteShutdownPrivilege	2868	shutdown.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3516	LogonUI.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 2236 wrote to memory of 1536	2236	VNPT7_XClient.exe	91
PID 2236 wrote to memory of 1536	2236	VNPT7_XClient.exe	91
PID 2236 wrote to memory of 2192	2236	VNPT7_XClient.exe	94
PID 2236 wrote to memory of 2192	2236	VNPT7_XClient.exe	94
PID 2236 wrote to memory of 4040	2236	VNPT7_XClient.exe	97
PID 2236 wrote to memory of 4040	2236	VNPT7_XClient.exe	97
PID 2236 wrote to memory of 3788	2236	VNPT7_XClient.exe	99
PID 2236 wrote to memory of 3788	2236	VNPT7_XClient.exe	99
PID 2236 wrote to memory of 3340	2236	VNPT7_XClient.exe	102
PID 2236 wrote to memory of 3340	2236	VNPT7_XClient.exe	102
PID 2236 wrote to memory of 2868	2236	VNPT7_XClient.exe	121
PID 2236 wrote to memory of 2868	2236	VNPT7_XClient.exe	121

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\VNPT7_XClient.exe
"C:\Users\Admin\AppData\Local\Temp\VNPT7_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:2236
- 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\VNPT7_XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1536
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'VNPT7_XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2192
- 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:4040
- 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:3788
- 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:3340
- C:\Windows\SYSTEM32\shutdown.exe
  shutdown.exe /f /s /t 0
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2868

C:\Users\Admin\AppData\Roaming\Sihost.exe
C:\Users\Admin\AppData\Roaming\Sihost.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1388

C:\Users\Admin\AppData\Roaming\Sihost.exe
C:\Users\Admin\AppData\Roaming\Sihost.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3212

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x4 /state0:0xa3920855 /state1:0x41c64e6d
1⤵
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:3516

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\Sihost.exe.log

Filesize
654B

MD5
2ff39f6c7249774be85fd60a8f9a245e

SHA1
684ff36b31aedc1e587c8496c02722c6698c1c4e

SHA256
e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced

SHA512
1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1

Download Submit
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
d28a889fd956d5cb3accfbaf1143eb6f

SHA1
157ba54b365341f8ff06707d996b3635da8446f7

SHA256
21e5d7ccf80a293e6ba30ed728846ca19c929c52b96e2c8d34e27cd2234f1d45

SHA512
0b6d88deb9be85722e6a78d5886d49f2caf407a59e128d2b4ed74c1356f9928c40048a62731959f2460e9ff9d9feee311043d2a37abe3bb92c2b76a44281478c

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

Filesize
944B

MD5
a213ba052f59c7807dc8a69afe3b2fc0

SHA1
6b3ac97cef759178944614fe3a81dc1eb5c5a192

SHA256
48231256a267dbe542a3a70ca499f477c468d21aa991ad43a19e140fb897e579

SHA512
669a56928307a875147d26e79515fe4da121981bf12191df8b92eb4dee706838404e01f4a19ec689227ebf4ec972426c34f77f7131ef92e01b7f6d20d6783b59

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

Filesize
944B

MD5
d3e8199b4634731cf0a0c26c1f14f588

SHA1
7f8fae27eb80055a436a6b5457978f32673d9ad4

SHA256
ef33f487f93c2977e92fb08d6bdcc9d48b5d1864c402f9d3fbf3e1b30e8b3b9a

SHA512
806a123100dbc1ca1b27bbad5b93c3a9a840dc795127af8523333a71259a8c5ef8aefccb83ef390f2644e013f138c4b7b63c584acccb197aada0c70c038032e2

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_two3ojsa.vhf.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Roaming\Sihost.exe

Filesize
67KB

MD5
51c54850a03f6858fe61e195110f33d9

SHA1
6e804a790b2b9a63f02d756a963fb76472d789cf

SHA256
9ee2b4dfcae8b6e7681dc6691ffd4dcfb521d061188b805e4c09f4151bbb9674

SHA512
642e969c5dc7165cf63dda7423ea42042878949909e860a73fabeb1bd9b2083fe026a705eb94be99fc68f691f4ca0a3ed820037afb2a35323e628b52941ec16c

Download Submit
memory/1536-12-0x00007FFC60560000-0x00007FFC61021000-memory.dmp

Filesize
10.8MB

Download
memory/1536-16-0x00007FFC60560000-0x00007FFC61021000-memory.dmp

Filesize
10.8MB

Download
memory/1536-13-0x00007FFC60560000-0x00007FFC61021000-memory.dmp

Filesize
10.8MB

Download
memory/1536-7-0x000001FDBE020000-0x000001FDBE042000-memory.dmp

Filesize
136KB

Download
memory/2236-0-0x00007FFC60563000-0x00007FFC60565000-memory.dmp

Filesize
8KB

Download
memory/2236-56-0x00007FFC60560000-0x00007FFC61021000-memory.dmp

Filesize
10.8MB

Download
memory/2236-57-0x00007FFC60563000-0x00007FFC60565000-memory.dmp

Filesize
8KB

Download
memory/2236-58-0x00007FFC60560000-0x00007FFC61021000-memory.dmp

Filesize
10.8MB

Download
memory/2236-1-0x0000000000300000-0x0000000000318000-memory.dmp

Filesize
96KB

Download
memory/2236-65-0x00007FFC60560000-0x00007FFC61021000-memory.dmp

Filesize
10.8MB

Download
memory/3788-51-0x000001E16BE50000-0x000001E16C06C000-memory.dmp

Filesize
2.1MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads