xworm | 41ac04f717912442f57958f140f4e7da4f09a2866b01d7f6bae75f94fa4c96e6

General

Target

XClient2.exe
Size

72KB
MD5

40663a80e6470891d3c983b7143f460f
SHA1

d41411214e04ea17eac12174abac3d746c01b59e
SHA256

41ac04f717912442f57958f140f4e7da4f09a2866b01d7f6bae75f94fa4c96e6
SHA512

069a3bd3f786ba22d3502ad4d4117f7abfe3e8ee6c4c35518b6398efdb8bcab00a0ba4d493d8d6670a4ba7185d727c631ee2349744ae127138801509a42f339d
SSDEEP

1536:JMIahO8dQiGSmttjQR8YRZZbMgA/omS8W5XZF6KdSyuDbkOBjnBn:7OdQnthQRPZbMgA/fIZZdSyusOBVn

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Version

3.1

C2

http://127.0.0.1:4040

Attributes

Install_directory
%Temp%
install_file
USB.exe

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral2/memory/4632-0-0x00000000003B0000-0x00000000003C8000-memory.dmp	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat 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
3068	powershell.exe
3240	powershell.exe
4552	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-1-5-21-1705699165-553239100-4129523827-1000\Control Panel\International\Geo\Nation	XClient2.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\XClient2.lnk	XClient2.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\XClient2.lnk	XClient2.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-1-5-21-1705699165-553239100-4129523827-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\XClient2 = "C:\\Users\\Admin\\AppData\\Local\\Temp\\XClient2.exe"	XClient2.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
22	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
2888	schtasks.exe

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
3068	powershell.exe
3068	powershell.exe
3240	powershell.exe
3240	powershell.exe
4552	powershell.exe
4552	powershell.exe
4632	XClient2.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	4632	XClient2.exe
Token: SeDebugPrivilege	3068	powershell.exe
Token: SeDebugPrivilege	3240	powershell.exe
Token: SeDebugPrivilege	4552	powershell.exe
Token: SeDebugPrivilege	4632	XClient2.exe
Token: SeDebugPrivilege	3032	XClient2.exe
Token: SeDebugPrivilege	4820	XClient2.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4632	XClient2.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4632 wrote to memory of 3068	4632	XClient2.exe	92
PID 4632 wrote to memory of 3068	4632	XClient2.exe	92
PID 4632 wrote to memory of 3240	4632	XClient2.exe	94
PID 4632 wrote to memory of 3240	4632	XClient2.exe	94
PID 4632 wrote to memory of 4552	4632	XClient2.exe	96
PID 4632 wrote to memory of 4552	4632	XClient2.exe	96
PID 4632 wrote to memory of 2888	4632	XClient2.exe	99
PID 4632 wrote to memory of 2888	4632	XClient2.exe	99

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\XClient2.exe
"C:\Users\Admin\AppData\Local\Temp\XClient2.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:4632
- 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\XClient2.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3068
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'XClient2.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3240
- 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\XClient2.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4552
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "XClient2" /tr "C:\Users\Admin\AppData\Local\Temp\XClient2.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2888

C:\Users\Admin\AppData\Local\Temp\XClient2.exe
C:\Users\Admin\AppData\Local\Temp\XClient2.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:3032

C:\Users\Admin\AppData\Local\Temp\XClient2.exe
C:\Users\Admin\AppData\Local\Temp\XClient2.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4820

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\XClient2.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
2979eabc783eaca50de7be23dd4eafcf

SHA1
d709ce5f3a06b7958a67e20870bfd95b83cad2ea

SHA256
006cca90e78fbb571532a83082ac6712721a34ea4b21f490058ffb3f521f4903

SHA512
92bc433990572d9427d0c93eef9bd1cc23fa00ed60dd0c9c983d87d3421e02ce3f156c6f88fe916ef6782dbf185cbce083bc0094f8c527f302be6a37d1c53aba

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

Filesize
944B

MD5
0256bd284691ed0fc502ef3c8a7e58dc

SHA1
dcdf69dc8ca8bf068f65d20ef1563bbe283e2413

SHA256
e2fb83098e114084f51ed7187334f861ce670051046c39f338928296ca9a49cf

SHA512
c5b29c1e0a15ddb68b0579848066774fa7cdc6f35087bbbf47c05a5c0dcc1eb3e61b2ddadfbded8c1ed9820e637596a9f08a97db8fb18000d168e6b159060c42

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ltneiwjc.pkt.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/3068-18-0x00007FF8334D0000-0x00007FF833F91000-memory.dmp

Filesize
10.8MB

Download
memory/3068-14-0x00007FF8334D0000-0x00007FF833F91000-memory.dmp

Filesize
10.8MB

Download
memory/3068-15-0x00007FF8334D0000-0x00007FF833F91000-memory.dmp

Filesize
10.8MB

Download
memory/3068-4-0x000002414FFD0000-0x000002414FFF2000-memory.dmp

Filesize
136KB

Download
memory/3068-13-0x00007FF8334D0000-0x00007FF833F91000-memory.dmp

Filesize
10.8MB

Download
memory/4632-0-0x00000000003B0000-0x00000000003C8000-memory.dmp

Filesize
96KB

Download
memory/4632-2-0x00007FF8334D0000-0x00007FF833F91000-memory.dmp

Filesize
10.8MB

Download
memory/4632-43-0x000000001B710000-0x000000001B812000-memory.dmp

Filesize
1.0MB

Download
memory/4632-45-0x00007FF8334D3000-0x00007FF8334D5000-memory.dmp

Filesize
8KB

Download
memory/4632-46-0x00007FF8334D0000-0x00007FF833F91000-memory.dmp

Filesize
10.8MB

Download
memory/4632-1-0x00007FF8334D3000-0x00007FF8334D5000-memory.dmp

Filesize
8KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads