xworm | d6684b27eb3b9913fd9742bf3ce9c38e5f089211b0c105893e44eeaf79f691a2

General

Target

XClient.exe
Size

80KB
MD5

bee4a56d9ba0426d3c95dde1970f6429
SHA1

2bfa99521d4a4f2ed6f9b457074ecf1fae7cd712
SHA256

d6684b27eb3b9913fd9742bf3ce9c38e5f089211b0c105893e44eeaf79f691a2
SHA512

294855ac413dec844467c23ddef1dd87334d0f83f5053a6e9e0b66f032d48e748351f4fa95e166d33c4385c4734d4f4af27365d3379d480a5b5a8ecb30e5f660
SSDEEP

1536:NF423Du5xn5JrsFkAZb1SfMP0I6naOwi0Wasei/mH:NF42zux5WFkAZb14xaObRoH

Score

10^/10

Malware Config

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/memory/3636-1-0x00000000003C0000-0x00000000003DA000-memory.dmp	family_xworm
behavioral2/files/0x0010000000023b85-48.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 3 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
2564	powershell.exe
4488	powershell.exe
3096	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-1-5-21-3350944739-639801879-157714471-1000\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\XClient.lnk	XClient.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\XClient.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-1-5-21-3350944739-639801879-157714471-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\XClient = "C:\\Users\\Admin\\AppData\\Local\\XClient.exe"	XClient.exe

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

System Information Discovery
T1082

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3404	timeout.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
348	schtasks.exe

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
3096	powershell.exe
3096	powershell.exe
2564	powershell.exe
2564	powershell.exe
4488	powershell.exe
4488	powershell.exe
3636	XClient.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	3636	XClient.exe
Token: SeDebugPrivilege	3096	powershell.exe
Token: SeDebugPrivilege	2564	powershell.exe
Token: SeDebugPrivilege	4488	powershell.exe
Token: SeDebugPrivilege	3636	XClient.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3636	XClient.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 3636 wrote to memory of 3096	3636	XClient.exe	85
PID 3636 wrote to memory of 3096	3636	XClient.exe	85
PID 3636 wrote to memory of 2564	3636	XClient.exe	87
PID 3636 wrote to memory of 2564	3636	XClient.exe	87
PID 3636 wrote to memory of 4488	3636	XClient.exe	89
PID 3636 wrote to memory of 4488	3636	XClient.exe	89
PID 3636 wrote to memory of 348	3636	XClient.exe	91
PID 3636 wrote to memory of 348	3636	XClient.exe	91
PID 3636 wrote to memory of 672	3636	XClient.exe	98
PID 3636 wrote to memory of 672	3636	XClient.exe	98
PID 3636 wrote to memory of 4312	3636	XClient.exe	100
PID 3636 wrote to memory of 4312	3636	XClient.exe	100
PID 4312 wrote to memory of 3404	4312	cmd.exe	102
PID 4312 wrote to memory of 3404	4312	cmd.exe	102

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 behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3636
- 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:3096
- 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:2564
- 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\XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4488
- 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\Local\XClient.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:348
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /delete /f /tn "XClient"
  2⤵
  PID:672
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp40FC.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4312
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:3404

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

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
6d3e9c29fe44e90aae6ed30ccf799ca8

SHA1
c7974ef72264bbdf13a2793ccf1aed11bc565dce

SHA256
2360634e63e8f0b5748e2c56ebb8f4aa78e71008ea7b5c9ca1c49be03b49557d

SHA512
60c38c4367352537545d859f64b9c5cbada94240478d1d039fd27b5ecba4dc1c90051557c16d802269703b873546ead416279c0a80c6fd5e49ad361cef22596a

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

Filesize
944B

MD5
15dde0683cd1ca19785d7262f554ba93

SHA1
d039c577e438546d10ac64837b05da480d06bf69

SHA256
d6fa39eab7ee36f44dc3f9f2839d098433db95c1eba924e4bcf4e5c0d268d961

SHA512
57c0e1b87bc1c136f0d39f3ce64bb8f8274a0491e4ca6e45e5c7f9070aa9d9370c6f590ce37cd600b252df2638d870205249a514c43245ca7ed49017024a4672

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_4x1jhe2f.0fy.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp40FC.tmp.bat

Filesize
159B

MD5
8d6d0c78dfed111c26b1de8ff91067ad

SHA1
c78c6d953e806a0b3b4ca66e5d155afd9cd8be2e

SHA256
67146207466a6c4744d95703e9ac8aa308c0ad30efe1f7b74ac09357516b585f

SHA512
2a727138e2c708709df9b9080d1d576e0f3cead25f088bdf73956c22a2bf42763a6da02cff67ca2df443e5641a4aa3313851a83025b8a973e1b6dc1ff3420576

Download Submit
C:\Users\Admin\AppData\Local\XClient.exe

Filesize
80KB

MD5
bee4a56d9ba0426d3c95dde1970f6429

SHA1
2bfa99521d4a4f2ed6f9b457074ecf1fae7cd712

SHA256
d6684b27eb3b9913fd9742bf3ce9c38e5f089211b0c105893e44eeaf79f691a2

SHA512
294855ac413dec844467c23ddef1dd87334d0f83f5053a6e9e0b66f032d48e748351f4fa95e166d33c4385c4734d4f4af27365d3379d480a5b5a8ecb30e5f660

Download Submit
memory/3096-14-0x000001CCC2360000-0x000001CCC2382000-memory.dmp

Filesize
136KB

Download
memory/3096-17-0x00007FFD1A0F0000-0x00007FFD1A2E5000-memory.dmp

Filesize
2.0MB

Download
memory/3096-3-0x00007FFD1A0F0000-0x00007FFD1A2E5000-memory.dmp

Filesize
2.0MB

Download
memory/3096-4-0x00007FFD1A0F0000-0x00007FFD1A2E5000-memory.dmp

Filesize
2.0MB

Download
memory/3096-2-0x00007FFD1A0F0000-0x00007FFD1A2E5000-memory.dmp

Filesize
2.0MB

Download
memory/3636-43-0x00007FFD1A0F0000-0x00007FFD1A2E5000-memory.dmp

Filesize
2.0MB

Download
memory/3636-0-0x00007FFD1A0F0000-0x00007FFD1A2E5000-memory.dmp

Filesize
2.0MB

Download
memory/3636-50-0x00007FFD1A0F0000-0x00007FFD1A2E5000-memory.dmp

Filesize
2.0MB

Download
memory/3636-51-0x00007FFD1A0F0000-0x00007FFD1A2E5000-memory.dmp

Filesize
2.0MB

Download
memory/3636-58-0x00007FFD1A0F0000-0x00007FFD1A2E5000-memory.dmp

Filesize
2.0MB

Download
memory/3636-1-0x00000000003C0000-0x00000000003DA000-memory.dmp

Filesize
104KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads