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 4 IoCs

resource	yara_rule
behavioral1/memory/2376-1-0x00000000012C0000-0x00000000012D8000-memory.dmp	family_xworm
behavioral1/files/0x000d000000012263-35.dat	family_xworm
behavioral1/memory/2092-37-0x0000000000BB0000-0x0000000000BC8000-memory.dmp	family_xworm
behavioral1/memory/1988-40-0x0000000000270000-0x0000000000288000-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
1404	powershell.exe
2440	powershell.exe
2296	powershell.exe
2632	powershell.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
2092	Sihost.exe
1988	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-1-5-21-1488793075-819845221-1497111674-1000\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
4	pastebin.com
5	pastebin.com

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

System Information Discovery
T1082

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
1352	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1404	powershell.exe
2440	powershell.exe
2296	powershell.exe
2632	powershell.exe

Suspicious use of AdjustPrivilegeToken 10 IoCs

description	pid	Process
Token: SeDebugPrivilege	2376	VNPT7_XClient.exe
Token: SeDebugPrivilege	1404	powershell.exe
Token: SeDebugPrivilege	2440	powershell.exe
Token: SeDebugPrivilege	2296	powershell.exe
Token: SeDebugPrivilege	2632	powershell.exe
Token: SeDebugPrivilege	2376	VNPT7_XClient.exe
Token: SeDebugPrivilege	2092	Sihost.exe
Token: SeDebugPrivilege	1988	Sihost.exe
Token: SeShutdownPrivilege	1880	shutdown.exe
Token: SeRemoteShutdownPrivilege	1880	shutdown.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 2376 wrote to memory of 1404	2376	VNPT7_XClient.exe	31
PID 2376 wrote to memory of 1404	2376	VNPT7_XClient.exe	31
PID 2376 wrote to memory of 1404	2376	VNPT7_XClient.exe	31
PID 2376 wrote to memory of 2440	2376	VNPT7_XClient.exe	33
PID 2376 wrote to memory of 2440	2376	VNPT7_XClient.exe	33
PID 2376 wrote to memory of 2440	2376	VNPT7_XClient.exe	33
PID 2376 wrote to memory of 2296	2376	VNPT7_XClient.exe	35
PID 2376 wrote to memory of 2296	2376	VNPT7_XClient.exe	35
PID 2376 wrote to memory of 2296	2376	VNPT7_XClient.exe	35
PID 2376 wrote to memory of 2632	2376	VNPT7_XClient.exe	37
PID 2376 wrote to memory of 2632	2376	VNPT7_XClient.exe	37
PID 2376 wrote to memory of 2632	2376	VNPT7_XClient.exe	37
PID 2376 wrote to memory of 1352	2376	VNPT7_XClient.exe	39
PID 2376 wrote to memory of 1352	2376	VNPT7_XClient.exe	39
PID 2376 wrote to memory of 1352	2376	VNPT7_XClient.exe	39
PID 2192 wrote to memory of 2092	2192	taskeng.exe	43
PID 2192 wrote to memory of 2092	2192	taskeng.exe	43
PID 2192 wrote to memory of 2092	2192	taskeng.exe	43
PID 2192 wrote to memory of 1988	2192	taskeng.exe	45
PID 2192 wrote to memory of 1988	2192	taskeng.exe	45
PID 2192 wrote to memory of 1988	2192	taskeng.exe	45
PID 2376 wrote to memory of 1880	2376	VNPT7_XClient.exe	46
PID 2376 wrote to memory of 1880	2376	VNPT7_XClient.exe	46
PID 2376 wrote to memory of 1880	2376	VNPT7_XClient.exe	46

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⤵
- Drops startup file
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2376
- 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:1404
- 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:2440
- 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:2296
- 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:2632
- 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:1352
- C:\Windows\system32\shutdown.exe
  shutdown.exe /f /s /t 0
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1880

C:\Windows\system32\taskeng.exe
taskeng.exe {493BB155-901E-4162-96DC-B3C15973E77D} S-1-5-21-1488793075-819845221-1497111674-1000:UPNECVIU\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2192
- C:\Users\Admin\AppData\Roaming\Sihost.exe
  C:\Users\Admin\AppData\Roaming\Sihost.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2092
- C:\Users\Admin\AppData\Roaming\Sihost.exe
  C:\Users\Admin\AppData\Roaming\Sihost.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1988

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x0
1⤵
PID:2112

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

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
65506be6c040fb1f7252fe0dd5d1d3f4

SHA1
e438a2faef302369f753d00f2ef7fa56fd9f7a53

SHA256
cb696d40d7a4da4f58ba5275ee57043a50643ee9fb5ebe7d243b5c82f19a0cdc

SHA512
9be1ddefd4faf05337448239cfa9daf41090a67a9164014e558fc4dd37cd998bac56c1bba9d1b527832e23d9521db1ad78da72d925167b21a07a2ea4b36d3018

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

Filesize
67KB

MD5
51c54850a03f6858fe61e195110f33d9

SHA1
6e804a790b2b9a63f02d756a963fb76472d789cf

SHA256
9ee2b4dfcae8b6e7681dc6691ffd4dcfb521d061188b805e4c09f4151bbb9674

SHA512
642e969c5dc7165cf63dda7423ea42042878949909e860a73fabeb1bd9b2083fe026a705eb94be99fc68f691f4ca0a3ed820037afb2a35323e628b52941ec16c

Download Submit
memory/1404-6-0x00000000028C0000-0x0000000002940000-memory.dmp

Filesize
512KB

Download
memory/1404-7-0x000000001B6F0000-0x000000001B9D2000-memory.dmp

Filesize
2.9MB

Download
memory/1404-8-0x0000000001E70000-0x0000000001E78000-memory.dmp

Filesize
32KB

Download
memory/1988-40-0x0000000000270000-0x0000000000288000-memory.dmp

Filesize
96KB

Download
memory/2092-37-0x0000000000BB0000-0x0000000000BC8000-memory.dmp

Filesize
96KB

Download
memory/2376-31-0x0000000000600000-0x0000000000680000-memory.dmp

Filesize
512KB

Download
memory/2376-0-0x000007FEF58D3000-0x000007FEF58D4000-memory.dmp

Filesize
4KB

Download
memory/2376-32-0x000007FEF58D3000-0x000007FEF58D4000-memory.dmp

Filesize
4KB

Download
memory/2376-33-0x0000000000600000-0x0000000000680000-memory.dmp

Filesize
512KB

Download
memory/2376-1-0x00000000012C0000-0x00000000012D8000-memory.dmp

Filesize
96KB

Download
memory/2440-14-0x000000001B4E0000-0x000000001B7C2000-memory.dmp

Filesize
2.9MB

Download
memory/2440-15-0x0000000001EE0000-0x0000000001EE8000-memory.dmp

Filesize
32KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads