xworm | 37b9b2836d520f80072446950646e5263f7c038d725dce9095fbd3702ca0ba6b

General

Target

37b9b2836d520f80072446950646e5263f7c038d725dce9095fbd3702ca0ba6bN.exe
Size

66KB
MD5

529d7dd2ee40e162ee1e452266cf3370
SHA1

31753fd788e5aa7691983822b5f6bd54ec966e67
SHA256

37b9b2836d520f80072446950646e5263f7c038d725dce9095fbd3702ca0ba6b
SHA512

5e0e8b1f950fd97bb86cf04f70ca393fb99624fd4061485e9110bac61d55450bcd38dedf494fdc4678d932000cd1984c69804e85f21e083154aade9427d2c6a6
SSDEEP

1536:3neHSDcksj3CGVAfBeVjFu/fWHE0uGxvV6PG:3neHgfsjFVAfBcvce

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

perfect-ringtones.gl.at.ply.gg:15597

Attributes

Install_directory
%AppData%
install_file
XClient.exe

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral1/files/0x00080000000120fd-6.dat	family_xworm
behavioral1/memory/1556-7-0x0000000000E20000-0x0000000000E34000-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
2652	powershell.exe
2636	powershell.exe
1528	powershell.exe
2376	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 3 IoCs

pid	Process
1556	Xclient.exe
448	XClient.exe
1168	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-1-5-21-2703099537-420551529-3771253338-1000\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
4	ip-api.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
1288	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2652	powershell.exe
2636	powershell.exe
1528	powershell.exe
2376	powershell.exe
1556	Xclient.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	1556	Xclient.exe
Token: SeDebugPrivilege	2652	powershell.exe
Token: SeDebugPrivilege	2636	powershell.exe
Token: SeDebugPrivilege	1528	powershell.exe
Token: SeDebugPrivilege	2376	powershell.exe
Token: SeDebugPrivilege	1556	Xclient.exe
Token: SeDebugPrivilege	448	XClient.exe
Token: SeDebugPrivilege	1168	XClient.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1556	Xclient.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 1456 wrote to memory of 1556	1456	37b9b2836d520f80072446950646e5263f7c038d725dce9095fbd3702ca0ba6bN.exe	29
PID 1456 wrote to memory of 1556	1456	37b9b2836d520f80072446950646e5263f7c038d725dce9095fbd3702ca0ba6bN.exe	29
PID 1456 wrote to memory of 1556	1456	37b9b2836d520f80072446950646e5263f7c038d725dce9095fbd3702ca0ba6bN.exe	29
PID 1556 wrote to memory of 2652	1556	Xclient.exe	31
PID 1556 wrote to memory of 2652	1556	Xclient.exe	31
PID 1556 wrote to memory of 2652	1556	Xclient.exe	31
PID 1556 wrote to memory of 2636	1556	Xclient.exe	33
PID 1556 wrote to memory of 2636	1556	Xclient.exe	33
PID 1556 wrote to memory of 2636	1556	Xclient.exe	33
PID 1556 wrote to memory of 1528	1556	Xclient.exe	35
PID 1556 wrote to memory of 1528	1556	Xclient.exe	35
PID 1556 wrote to memory of 1528	1556	Xclient.exe	35
PID 1556 wrote to memory of 2376	1556	Xclient.exe	37
PID 1556 wrote to memory of 2376	1556	Xclient.exe	37
PID 1556 wrote to memory of 2376	1556	Xclient.exe	37
PID 1556 wrote to memory of 1288	1556	Xclient.exe	39
PID 1556 wrote to memory of 1288	1556	Xclient.exe	39
PID 1556 wrote to memory of 1288	1556	Xclient.exe	39
PID 996 wrote to memory of 448	996	taskeng.exe	42
PID 996 wrote to memory of 448	996	taskeng.exe	42
PID 996 wrote to memory of 448	996	taskeng.exe	42
PID 996 wrote to memory of 1168	996	taskeng.exe	43
PID 996 wrote to memory of 1168	996	taskeng.exe	43
PID 996 wrote to memory of 1168	996	taskeng.exe	43

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\37b9b2836d520f80072446950646e5263f7c038d725dce9095fbd3702ca0ba6bN.exe
"C:\Users\Admin\AppData\Local\Temp\37b9b2836d520f80072446950646e5263f7c038d725dce9095fbd3702ca0ba6bN.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1456
- C:\Users\Admin\AppData\Roaming\Xclient.exe
  "C:\Users\Admin\AppData\Roaming\Xclient.exe"
  2⤵
  - Drops startup file
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1556
- - 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'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2652
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Xclient.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2636
- - 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'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1528
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'XClient.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2376
- - 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"
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1288

C:\Windows\system32\taskeng.exe
taskeng.exe {DE342BBD-7420-4206-8BF9-27CF85719132} S-1-5-21-2703099537-420551529-3771253338-1000:XECUDNCD\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:996
- C:\Users\Admin\AppData\Roaming\XClient.exe
  C:\Users\Admin\AppData\Roaming\XClient.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:448
- C:\Users\Admin\AppData\Roaming\XClient.exe
  C:\Users\Admin\AppData\Roaming\XClient.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1168

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

Exfiltration

Impact

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Downloads

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

Filesize
7KB

MD5
b031962f141c0530eb7f160ab26f6737

SHA1
221c0425bfaa598a539200e50cf9370aa8f9727f

SHA256
76fe69ff4dc1c8df02a6dd8d260feff018cc25665c0a2ca5404a6ce20a5fc5a3

SHA512
4c46878ef487bf678ca93a351a8d7899e8368952189c7eb9caa3b89a18acfc5eca3f6f9e786c9dbdd1e7a94b4f02360b979b68208f3ddadad6846196c591013d

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

Filesize
56KB

MD5
361befaf798238d6fa0eb9a33e6c0857

SHA1
eea78ed5fb05ca4cdd5b287b33d50226cd0586da

SHA256
b0b9917c1fbd92139d919ef85206a6503489a0327053700beee5f1819dec2404

SHA512
3704cab8c32a5a50f8c5c7b68eed3a45dcce89065177322767bbd08c0bd8e98db7c1af86bf86f93164c0d18eaba82935a1e88c4b2e376ea2ddbfb3ed5b6bc01e

Download Submit
memory/1456-1-0x0000000000E50000-0x0000000000E66000-memory.dmp

Filesize
88KB

Download
memory/1456-0-0x000007FEF5E03000-0x000007FEF5E04000-memory.dmp

Filesize
4KB

Download
memory/1556-7-0x0000000000E20000-0x0000000000E34000-memory.dmp

Filesize
80KB

Download
memory/1556-8-0x000007FEF5E00000-0x000007FEF67EC000-memory.dmp

Filesize
9.9MB

Download
memory/1556-9-0x000007FEF5E00000-0x000007FEF67EC000-memory.dmp

Filesize
9.9MB

Download
memory/1556-37-0x000007FEF5E00000-0x000007FEF67EC000-memory.dmp

Filesize
9.9MB

Download
memory/1556-36-0x000007FEF5E00000-0x000007FEF67EC000-memory.dmp

Filesize
9.9MB

Download
memory/2636-21-0x000000001B760000-0x000000001BA42000-memory.dmp

Filesize
2.9MB

Download
memory/2636-22-0x0000000001DA0000-0x0000000001DA8000-memory.dmp

Filesize
32KB

Download
memory/2652-15-0x0000000001E00000-0x0000000001E08000-memory.dmp

Filesize
32KB

Download
memory/2652-14-0x000000001B7D0000-0x000000001BAB2000-memory.dmp

Filesize
2.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads