xworm | b52c318fa8920d155d54fe5c691a4439a65a017dc66debf5439ca8ff8bcd9b79

General

Target

exerat.exe
Size

144KB
MD5

2e8e927794b0c56324233077c43e3167
SHA1

0cb2f30a977e83c3ce6275673c718ae20ec32337
SHA256

b52c318fa8920d155d54fe5c691a4439a65a017dc66debf5439ca8ff8bcd9b79
SHA512

a4df86e1f16bb5f94f850e14be647ba5119170ac36e616a20bceab6d230d6f6de6049fabaa416434611542b466306203a71ec36817b66e1af857185a1b5654c2
SSDEEP

3072:QYfiiyfb9mNOgQBQFF2RYtMgK+Wl9HhDhIpfeZQKGtoFLjMD:lSbPCjthy9H9h4mZQKen

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

147.185.221.21:37029

Attributes

Install_directory
%AppData%
install_file
Steam Client Service.exe

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral1/memory/2096-1-0x0000000001210000-0x000000000123A000-memory.dmp	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat 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
2704	powershell.exe
2740	powershell.exe
2632	powershell.exe
2684	powershell.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Steam Client Service.lnk	exerat.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Steam Client Service.lnk	exerat.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-1-5-21-2872745919-2748461613-2989606286-1000\Software\Microsoft\Windows\CurrentVersion\Run\Steam Client Service = "C:\\Users\\Admin\\AppData\\Roaming\\Steam Client Service.exe"	exerat.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
664	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2704	powershell.exe
2740	powershell.exe
2632	powershell.exe
2684	powershell.exe
2096	exerat.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	2096	exerat.exe
Token: SeDebugPrivilege	2704	powershell.exe
Token: SeDebugPrivilege	2740	powershell.exe
Token: SeDebugPrivilege	2632	powershell.exe
Token: SeDebugPrivilege	2684	powershell.exe
Token: SeDebugPrivilege	2096	exerat.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2096	exerat.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2096 wrote to memory of 2704	2096	exerat.exe	31
PID 2096 wrote to memory of 2704	2096	exerat.exe	31
PID 2096 wrote to memory of 2704	2096	exerat.exe	31
PID 2096 wrote to memory of 2740	2096	exerat.exe	33
PID 2096 wrote to memory of 2740	2096	exerat.exe	33
PID 2096 wrote to memory of 2740	2096	exerat.exe	33
PID 2096 wrote to memory of 2632	2096	exerat.exe	35
PID 2096 wrote to memory of 2632	2096	exerat.exe	35
PID 2096 wrote to memory of 2632	2096	exerat.exe	35
PID 2096 wrote to memory of 2684	2096	exerat.exe	37
PID 2096 wrote to memory of 2684	2096	exerat.exe	37
PID 2096 wrote to memory of 2684	2096	exerat.exe	37
PID 2096 wrote to memory of 664	2096	exerat.exe	39
PID 2096 wrote to memory of 664	2096	exerat.exe	39
PID 2096 wrote to memory of 664	2096	exerat.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\exerat.exe
"C:\Users\Admin\AppData\Local\Temp\exerat.exe"
1⤵
- 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:2096
- 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\exerat.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2704
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'exerat.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2740
- 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\Steam Client Service.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - 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 'Steam Client Service.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2684
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "Steam Client Service" /tr "C:\Users\Admin\AppData\Roaming\Steam Client Service.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:664

C:\Windows\system32\taskeng.exe
taskeng.exe {6E263324-2D28-4DF7-BA62-0DF27C6829D3} S-1-5-21-2872745919-2748461613-2989606286-1000:CCJBVTGQ\Admin:Interactive:[1]
1⤵
PID:2432

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\9US49KLT1PB7IW9F263N.temp

Filesize
7KB

MD5
342150f5ad9f5b4fb1b91f9679a3e7b8

SHA1
cc6a51043fee04241dc03f91ef522ace81bc584f

SHA256
07a087c621adf6fd24bb54939d01e2dfa4928ffe9c2f52137aad76b8307c81dc

SHA512
17eb59b1724f706d0efdc7ffb14e499edf5d095b7e1e3aa2b39afa54309b8b6385f7d1e7e6df932e021005247a55f6c428d5cfad616945ca88eb85433ae5abaa

Download Submit
memory/2096-0-0x000007FEF5973000-0x000007FEF5974000-memory.dmp

Filesize
4KB

Download
memory/2096-1-0x0000000001210000-0x000000000123A000-memory.dmp

Filesize
168KB

Download
memory/2096-2-0x000007FEF5970000-0x000007FEF635C000-memory.dmp

Filesize
9.9MB

Download
memory/2096-27-0x000007FEF5973000-0x000007FEF5974000-memory.dmp

Filesize
4KB

Download
memory/2096-32-0x000007FEF5970000-0x000007FEF635C000-memory.dmp

Filesize
9.9MB

Download
memory/2704-7-0x0000000002760000-0x00000000027E0000-memory.dmp

Filesize
512KB

Download
memory/2704-8-0x000000001B600000-0x000000001B8E2000-memory.dmp

Filesize
2.9MB

Download
memory/2704-9-0x0000000001E80000-0x0000000001E88000-memory.dmp

Filesize
32KB

Download
memory/2740-15-0x000000001B5A0000-0x000000001B882000-memory.dmp

Filesize
2.9MB

Download
memory/2740-16-0x0000000001F50000-0x0000000001F58000-memory.dmp

Filesize
32KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads