xworm | 23ecee99ee4ab7a150f91d4202033a6629cf5af74d80b6a12c2396f1f775734f

General

Target

RuntimeBroker.exe
Size

73KB
MD5

7a5408d9535b2e5db8d194f4d8b93c23
SHA1

c8c6caf9f750b4bc756b40c41f00c3ed3af7fbeb
SHA256

23ecee99ee4ab7a150f91d4202033a6629cf5af74d80b6a12c2396f1f775734f
SHA512

95ef1bdb1e56b3d9c6809586ea0d8ff197375584f8625748811dceb4783fb693749b49c3ed0890c23782946acec3ba5baadcf49735a87985e30f14081a365fd8
SSDEEP

1536:Jb2yCofWhUvuJJH9o2qMnfAQPJwz7opMfQxnbSUyJhb/KpKU+k6eeOJ5w0pIBAM:nWhUvuJB9o2qMnfAQPJKy1jyJhb/KHhO

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Attributes

Install_directory
%ProgramData%
install_file
USB.exe
pastebin_url
https://pastebin.com/raw/DSFaHH8B

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral1/memory/2296-1-0x0000000000390000-0x00000000003A8000-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
2356	powershell.exe
1056	powershell.exe
2688	powershell.exe
2584	powershell.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-1-5-21-312935884-697965778-3955649944-1000\Software\Microsoft\Windows\CurrentVersion\Run\Runtime Broker = "C:\\ProgramData\\Runtime Broker"	RuntimeBroker.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
2632	schtasks.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
2296	RuntimeBroker.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2356	powershell.exe
1056	powershell.exe
2688	powershell.exe
2584	powershell.exe
2296	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	2296	RuntimeBroker.exe
Token: SeDebugPrivilege	2356	powershell.exe
Token: SeDebugPrivilege	1056	powershell.exe
Token: SeDebugPrivilege	2688	powershell.exe
Token: SeDebugPrivilege	2584	powershell.exe
Token: SeDebugPrivilege	2296	RuntimeBroker.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2296	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2296 wrote to memory of 2356	2296	RuntimeBroker.exe	31
PID 2296 wrote to memory of 2356	2296	RuntimeBroker.exe	31
PID 2296 wrote to memory of 2356	2296	RuntimeBroker.exe	31
PID 2296 wrote to memory of 1056	2296	RuntimeBroker.exe	33
PID 2296 wrote to memory of 1056	2296	RuntimeBroker.exe	33
PID 2296 wrote to memory of 1056	2296	RuntimeBroker.exe	33
PID 2296 wrote to memory of 2688	2296	RuntimeBroker.exe	35
PID 2296 wrote to memory of 2688	2296	RuntimeBroker.exe	35
PID 2296 wrote to memory of 2688	2296	RuntimeBroker.exe	35
PID 2296 wrote to memory of 2584	2296	RuntimeBroker.exe	37
PID 2296 wrote to memory of 2584	2296	RuntimeBroker.exe	37
PID 2296 wrote to memory of 2584	2296	RuntimeBroker.exe	37
PID 2296 wrote to memory of 2632	2296	RuntimeBroker.exe	39
PID 2296 wrote to memory of 2632	2296	RuntimeBroker.exe	39
PID 2296 wrote to memory of 2632	2296	RuntimeBroker.exe	39

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\RuntimeBroker.exe
"C:\Users\Admin\AppData\Local\Temp\RuntimeBroker.exe"
1⤵
- Adds Run key to start application
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2296
- 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\RuntimeBroker.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2356
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'RuntimeBroker.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1056
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\ProgramData\Runtime Broker'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2688
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Runtime Broker'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2584
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "Runtime Broker" /tr "C:\ProgramData\Runtime Broker"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2632

C:\Windows\system32\taskeng.exe
taskeng.exe {50B969B5-67FC-44CE-AE63-7AAD783CBD00} S-1-5-21-312935884-697965778-3955649944-1000:MXQFNXLT\Admin:Interactive:[1]
1⤵
PID:1844

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
4ef3e39a87dc589e48ed8e4c4eef8172

SHA1
31097e42932efa625f11b27134ae29cab269e464

SHA256
f3cace0797efbd1801aeebe2bd70a3020144b35643ba1aade3aaf6271e1048e7

SHA512
f9a59365e8efa2fcd4589bc6a7daec7f85a630a89fe76b8fe6417f7ef2c924eb54806c12a8a2abd5ecdec4457ae348b16cef94f6757742a3906dcac482f1ca73

Download Submit
memory/1056-15-0x0000000001F60000-0x0000000001F68000-memory.dmp

Filesize
32KB

Download
memory/1056-14-0x000000001B550000-0x000000001B832000-memory.dmp

Filesize
2.9MB

Download
memory/2296-0-0x000007FEF5E53000-0x000007FEF5E54000-memory.dmp

Filesize
4KB

Download
memory/2296-1-0x0000000000390000-0x00000000003A8000-memory.dmp

Filesize
96KB

Download
memory/2296-28-0x000000001B2F0000-0x000000001B370000-memory.dmp

Filesize
512KB

Download
memory/2296-29-0x000007FEF5E53000-0x000007FEF5E54000-memory.dmp

Filesize
4KB

Download
memory/2296-30-0x000000001B2F0000-0x000000001B370000-memory.dmp

Filesize
512KB

Download
memory/2356-6-0x0000000002D10000-0x0000000002D90000-memory.dmp

Filesize
512KB

Download
memory/2356-7-0x000000001B690000-0x000000001B972000-memory.dmp

Filesize
2.9MB

Download
memory/2356-8-0x0000000002040000-0x0000000002048000-memory.dmp

Filesize
32KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads