xworm | feba3474a30f9b010741c34ee4773777fc329390418713ffef424b2eb9243a5f

General

Target

crss.exe
Size

40KB
MD5

3ab61ee8a81099edddf87af587420a10
SHA1

d6c0f6f60d13cc786cf7ac0df2c45b5dc47b945c
SHA256

feba3474a30f9b010741c34ee4773777fc329390418713ffef424b2eb9243a5f
SHA512

f43326c79ea8bd118fd90efc8c2c8306e02901727ffd7c6666b2a35820eb8799976007f4886a68a7f411509ad61dcf7ddf5a3630fa5342014ad5aa978818ff3f
SSDEEP

768:pNfPMSk3K/EzTb/008WuFZ4ZJF5PC9O9Fy68OMhi3/aV:nf05a/CTjp89IFc9Uc68OMsi

Score

10^/10

xworm execution rat trojan

Malware Config

Extracted

Family

xworm

Version

5.0

C2

154.197.69.165:7000

Mutex

jcTVbnlMjCEJAYCp

Attributes

Install_directory
%AppData%
install_file
crss.exe

aes.plain

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral1/memory/2564-1-0x0000000001230000-0x0000000001240000-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
2868	powershell.exe
2520	powershell.exe
2676	powershell.exe
2836	powershell.exe

Drops startup file 2 IoCs

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

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2836	powershell.exe
2868	powershell.exe
2520	powershell.exe
2676	powershell.exe
2564	crss.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	2564	crss.exe
Token: SeDebugPrivilege	2836	powershell.exe
Token: SeDebugPrivilege	2868	powershell.exe
Token: SeDebugPrivilege	2520	powershell.exe
Token: SeDebugPrivilege	2676	powershell.exe
Token: SeDebugPrivilege	2564	crss.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2564	crss.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 2564 wrote to memory of 2836	2564	crss.exe	32
PID 2564 wrote to memory of 2836	2564	crss.exe	32
PID 2564 wrote to memory of 2836	2564	crss.exe	32
PID 2564 wrote to memory of 2868	2564	crss.exe	34
PID 2564 wrote to memory of 2868	2564	crss.exe	34
PID 2564 wrote to memory of 2868	2564	crss.exe	34
PID 2564 wrote to memory of 2520	2564	crss.exe	36
PID 2564 wrote to memory of 2520	2564	crss.exe	36
PID 2564 wrote to memory of 2520	2564	crss.exe	36
PID 2564 wrote to memory of 2676	2564	crss.exe	38
PID 2564 wrote to memory of 2676	2564	crss.exe	38
PID 2564 wrote to memory of 2676	2564	crss.exe	38

C:\Users\Admin\AppData\Local\Temp\crss.exe
"C:\Users\Admin\AppData\Local\Temp\crss.exe"
1⤵
- Drops startup file
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2564
- 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\crss.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2836
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'crss.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2868
- 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\crss.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2520
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'crss.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2676

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

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

Filesize
7KB

MD5
f2670dd3896b349dbe3cdbf8bbe1cab5

SHA1
37aac39882af6328c791c4a30d70cfe824bf1f1a

SHA256
5b268e50924375fbbe820550201111de3fd4600d5a134a462b13806b351cc910

SHA512
8c1f4a6f5d9676d0e4c12f10782f2fab149747ede5c02eacadbb8b50ad42376d8fe1ec151c63742672568a5f6eb9eb69201570c4b35af2e212899be609b07d5e

Download Submit
memory/2564-0-0x000007FEF6363000-0x000007FEF6364000-memory.dmp

Filesize
4KB

Download
memory/2564-1-0x0000000001230000-0x0000000001240000-memory.dmp

Filesize
64KB

Download
memory/2564-2-0x000007FEF6360000-0x000007FEF6D4C000-memory.dmp

Filesize
9.9MB

Download
memory/2564-28-0x000007FEF6363000-0x000007FEF6364000-memory.dmp

Filesize
4KB

Download
memory/2564-33-0x000007FEF6360000-0x000007FEF6D4C000-memory.dmp

Filesize
9.9MB

Download
memory/2836-7-0x0000000002C80000-0x0000000002D00000-memory.dmp

Filesize
512KB

Download
memory/2836-8-0x000000001B810000-0x000000001BAF2000-memory.dmp

Filesize
2.9MB

Download
memory/2836-9-0x0000000001E80000-0x0000000001E88000-memory.dmp

Filesize
32KB

Download
memory/2868-15-0x000000001B4D0000-0x000000001B7B2000-memory.dmp

Filesize
2.9MB

Download
memory/2868-16-0x0000000002790000-0x0000000002798000-memory.dmp

Filesize
32KB

Download

Analysis

Sharing