xworm | 4288137e125d257cce26bdabf57533f03f8aa7476ab6f3c33bc009d3a9f81df0

Analysis

max time kernel
118s
max time network
122s
platform
windows7_x64
resource
win7-20231215-en
resource tags

arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
submitted
17-02-2024 18:43

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General

Target

RuntimeBroker.exe
Size

77KB
MD5

7f3d8bc2d995a6d0780aeb80c3172a82
SHA1

781de6ee7e83ce7d159031f16e9677d7aff91516
SHA256

4288137e125d257cce26bdabf57533f03f8aa7476ab6f3c33bc009d3a9f81df0
SHA512

a6997ecde20919abc259b37bd8352b79908e0a0aab6a78cb8293d676e1249af66deeffd8d545227b17513f725a22f0503fa321403cf3c4f40811f8d58cce87cd
SSDEEP

1536:N0A5d1cL+IvRpH4/NbbnjIvUG64OeTIOMbeeSTuX1kC47:NDq5pHyNb3MdTIOweeIK1kP7

Score

10^/10

xworm persistence rat trojan

Malware Config

Extracted

Family

xworm

K1NGonTop-39501.portmap.io:39501

<Xwormmm>:1

Attributes

Install_directory
%Public%
install_file
RuntimeBroker.exe

Signatures

Detect Xworm Payload 3 IoCs

resource	yara_rule
behavioral1/memory/2492-0-0x0000000000FA0000-0x0000000000FB8000-memory.dmp	family_xworm
behavioral1/files/0x000e0000000132dc-61.dat	family_xworm
behavioral1/memory/1400-63-0x0000000000340000-0x0000000000358000-memory.dmp	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm

Deletes itself 1 IoCs

pid	Process
2116	cmd.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\RuntimeBroker.lnk	RuntimeBroker.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\RuntimeBroker.lnk	RuntimeBroker.exe

Executes dropped EXE 1 IoCs

pid	Process
1400	RuntimeBroker.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-1-5-21-1603059206-2004189698-4139800220-1000\Software\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "C:\\Users\\Public\\RuntimeBroker.exe"	RuntimeBroker.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

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
2004	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1444	timeout.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
2492	RuntimeBroker.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2884	powershell.exe
2572	powershell.exe
2632	powershell.exe
1496	powershell.exe
2492	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	2492	RuntimeBroker.exe
Token: SeDebugPrivilege	2884	powershell.exe
Token: SeDebugPrivilege	2572	powershell.exe
Token: SeDebugPrivilege	2632	powershell.exe
Token: SeDebugPrivilege	1496	powershell.exe
Token: SeDebugPrivilege	2492	RuntimeBroker.exe
Token: SeDebugPrivilege	1400	RuntimeBroker.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2492	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 2492 wrote to memory of 2884	2492	RuntimeBroker.exe	29
PID 2492 wrote to memory of 2884	2492	RuntimeBroker.exe	29
PID 2492 wrote to memory of 2884	2492	RuntimeBroker.exe	29
PID 2492 wrote to memory of 2572	2492	RuntimeBroker.exe	31
PID 2492 wrote to memory of 2572	2492	RuntimeBroker.exe	31
PID 2492 wrote to memory of 2572	2492	RuntimeBroker.exe	31
PID 2492 wrote to memory of 2632	2492	RuntimeBroker.exe	33
PID 2492 wrote to memory of 2632	2492	RuntimeBroker.exe	33
PID 2492 wrote to memory of 2632	2492	RuntimeBroker.exe	33
PID 2492 wrote to memory of 1496	2492	RuntimeBroker.exe	35
PID 2492 wrote to memory of 1496	2492	RuntimeBroker.exe	35
PID 2492 wrote to memory of 1496	2492	RuntimeBroker.exe	35
PID 2492 wrote to memory of 2004	2492	RuntimeBroker.exe	37
PID 2492 wrote to memory of 2004	2492	RuntimeBroker.exe	37
PID 2492 wrote to memory of 2004	2492	RuntimeBroker.exe	37
PID 2328 wrote to memory of 1400	2328	taskeng.exe	42
PID 2328 wrote to memory of 1400	2328	taskeng.exe	42
PID 2328 wrote to memory of 1400	2328	taskeng.exe	42
PID 2492 wrote to memory of 1988	2492	RuntimeBroker.exe	43
PID 2492 wrote to memory of 1988	2492	RuntimeBroker.exe	43
PID 2492 wrote to memory of 1988	2492	RuntimeBroker.exe	43
PID 2492 wrote to memory of 2116	2492	RuntimeBroker.exe	45
PID 2492 wrote to memory of 2116	2492	RuntimeBroker.exe	45
PID 2492 wrote to memory of 2116	2492	RuntimeBroker.exe	45
PID 2116 wrote to memory of 1444	2116	cmd.exe	47
PID 2116 wrote to memory of 1444	2116	cmd.exe	47
PID 2116 wrote to memory of 1444	2116	cmd.exe	47

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⤵
- Drops startup file
- 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:2492
- 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⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2884
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'RuntimeBroker.exe'
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2572
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Public\RuntimeBroker.exe'
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2632
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'RuntimeBroker.exe'
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1496
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "RuntimeBroker" /tr "C:\Users\Public\RuntimeBroker.exe"
  2⤵
  - Creates scheduled task(s)
  PID:2004
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /delete /f /tn "RuntimeBroker"
  2⤵
  PID:1988
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp3A90.tmp.bat""
  2⤵
  - Deletes itself
  - Suspicious use of WriteProcessMemory
  PID:2116
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:1444

C:\Windows\system32\taskeng.exe
taskeng.exe {7112508F-F51A-4718-A43E-A922433BA18F} S-1-5-21-1603059206-2004189698-4139800220-1000:AILVMYUM\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2328
- C:\Users\Public\RuntimeBroker.exe
  C:\Users\Public\RuntimeBroker.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1400

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp3A90.tmp.bat

Filesize
165B

MD5
09b034ccbe9deedf00e59f0bc4cb5248

SHA1
f862c154fcf88d177d05002fb8d3c087a0c462b2

SHA256
073689add7cdb7b0e5e30be45572a0aa30c2947eef5d61144d4fe4f26999f155

SHA512
330bb897d2d2b99f2af57ed50327301c1ece70948911657237e4b9d1873c430e1db754b73ed9d8248ccf67402fb30f30fa6cfe0c1440b0d0a33523068b47a224

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

Filesize
7KB

MD5
23b88027cae1ee8411c6da7c10a8b848

SHA1
47b0b73b92703c4bf255c0e96fc94dd66bb35b98

SHA256
02c8d44177ac3be7b28bf417e83671cedffd825d3bff4d0fbcd743ce68353fa1

SHA512
c65f12ef1f14b8a2f1060855f44bd0507f2653696ad9215631263a456b3392801b771dfe64a9a1eac179309f35ea2f4d5c61985351499a8d293558c0bdc304de

Download Submit
C:\Users\Public\RuntimeBroker.exe

Filesize
77KB

MD5
7f3d8bc2d995a6d0780aeb80c3172a82

SHA1
781de6ee7e83ce7d159031f16e9677d7aff91516

SHA256
4288137e125d257cce26bdabf57533f03f8aa7476ab6f3c33bc009d3a9f81df0

SHA512
a6997ecde20919abc259b37bd8352b79908e0a0aab6a78cb8293d676e1249af66deeffd8d545227b17513f725a22f0503fa321403cf3c4f40811f8d58cce87cd

Download Submit
memory/1400-65-0x000007FEF5350000-0x000007FEF5D3C000-memory.dmp

Filesize
9.9MB

Download
memory/1400-64-0x000007FEF5350000-0x000007FEF5D3C000-memory.dmp

Filesize
9.9MB

Download
memory/1400-63-0x0000000000340000-0x0000000000358000-memory.dmp

Filesize
96KB

Download
memory/1496-55-0x000007FEEDCA0000-0x000007FEEE63D000-memory.dmp

Filesize
9.6MB

Download
memory/1496-54-0x0000000002590000-0x0000000002610000-memory.dmp

Filesize
512KB

Download
memory/1496-53-0x000007FEEDCA0000-0x000007FEEE63D000-memory.dmp

Filesize
9.6MB

Download
memory/1496-52-0x0000000002590000-0x0000000002610000-memory.dmp

Filesize
512KB

Download
memory/1496-51-0x0000000002590000-0x0000000002610000-memory.dmp

Filesize
512KB

Download
memory/1496-50-0x0000000002590000-0x0000000002610000-memory.dmp

Filesize
512KB

Download
memory/1496-49-0x000007FEEDCA0000-0x000007FEEE63D000-memory.dmp

Filesize
9.6MB

Download
memory/2492-28-0x000007FEF5350000-0x000007FEF5D3C000-memory.dmp

Filesize
9.9MB

Download
memory/2492-0-0x0000000000FA0000-0x0000000000FB8000-memory.dmp

Filesize
96KB

Download
memory/2492-76-0x000007FEF5350000-0x000007FEF5D3C000-memory.dmp

Filesize
9.9MB

Download
memory/2492-1-0x000007FEF5350000-0x000007FEF5D3C000-memory.dmp

Filesize
9.9MB

Download
memory/2492-2-0x000000001B280000-0x000000001B300000-memory.dmp

Filesize
512KB

Download
memory/2492-41-0x000000001B280000-0x000000001B300000-memory.dmp

Filesize
512KB

Download
memory/2572-30-0x000000000299B000-0x0000000002A02000-memory.dmp

Filesize
412KB

Download
memory/2572-26-0x0000000002990000-0x0000000002A10000-memory.dmp

Filesize
512KB

Download
memory/2572-21-0x000000001B180000-0x000000001B462000-memory.dmp

Filesize
2.9MB

Download
memory/2572-27-0x0000000002990000-0x0000000002A10000-memory.dmp

Filesize
512KB

Download
memory/2572-24-0x000007FEEDCA0000-0x000007FEEE63D000-memory.dmp

Filesize
9.6MB

Download
memory/2572-23-0x0000000002660000-0x0000000002668000-memory.dmp

Filesize
32KB

Download
memory/2572-29-0x000007FEEDCA0000-0x000007FEEE63D000-memory.dmp

Filesize
9.6MB

Download
memory/2572-25-0x0000000002990000-0x0000000002A10000-memory.dmp

Filesize
512KB

Download
memory/2572-22-0x000007FEEDCA0000-0x000007FEEE63D000-memory.dmp

Filesize
9.6MB

Download
memory/2632-38-0x000007FEEE640000-0x000007FEEEFDD000-memory.dmp

Filesize
9.6MB

Download
memory/2632-42-0x0000000002A50000-0x0000000002AD0000-memory.dmp

Filesize
512KB

Download
memory/2632-43-0x000007FEEE640000-0x000007FEEEFDD000-memory.dmp

Filesize
9.6MB

Download
memory/2632-40-0x0000000002A50000-0x0000000002AD0000-memory.dmp

Filesize
512KB

Download
memory/2632-39-0x0000000002A50000-0x0000000002AD0000-memory.dmp

Filesize
512KB

Download
memory/2632-37-0x0000000002A50000-0x0000000002AD0000-memory.dmp

Filesize
512KB

Download
memory/2632-36-0x000007FEEE640000-0x000007FEEEFDD000-memory.dmp

Filesize
9.6MB

Download
memory/2884-15-0x000007FEEE640000-0x000007FEEEFDD000-memory.dmp

Filesize
9.6MB

Download
memory/2884-11-0x000007FEEE640000-0x000007FEEEFDD000-memory.dmp

Filesize
9.6MB

Download
memory/2884-10-0x000007FEEE640000-0x000007FEEEFDD000-memory.dmp

Filesize
9.6MB

Download
memory/2884-9-0x0000000001FC0000-0x0000000001FC8000-memory.dmp

Filesize
32KB

Download
memory/2884-8-0x000000001B270000-0x000000001B552000-memory.dmp

Filesize
2.9MB

Download
memory/2884-7-0x0000000002690000-0x0000000002710000-memory.dmp

Filesize
512KB

Download
memory/2884-13-0x0000000002690000-0x0000000002710000-memory.dmp

Filesize
512KB

Download
memory/2884-12-0x0000000002690000-0x0000000002710000-memory.dmp

Filesize
512KB

Download
memory/2884-14-0x0000000002690000-0x0000000002710000-memory.dmp

Filesize
512KB

Download