xworm | b9254a6ecd096658f98b82ebb751201b4e447b5ce3b7302b48fb228c9b516c23 | Triage

Analysis

max time kernel
148s
max time network
150s
platform
windows10-1703_x64
resource
win10-20240404-en
resource tags

arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
submitted
22-07-2024 19:05

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General

Target

Registry.exe
Size

77KB
MD5

9d6650618c58c87940342a370a32e509
SHA1

c579fae20e78573deeec2059c8119083ccdff7e2
SHA256

b9254a6ecd096658f98b82ebb751201b4e447b5ce3b7302b48fb228c9b516c23
SHA512

d37b31b2c9669980279e2ebf247811ddd2f43231766a735b8a904dd9de1034e10a5fb7ee23c80717f88d5e173b0ee84ee890b95f50e71590b57e03d8b81d6020
SSDEEP

1536:BQa31Z6Y6BFzJufgQIUbmVCcGDl4gBQOV8EaKiRE:BQZhB5IYTUbm1Yl4SQOV8EqE

Score

10^/10

xworm persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

147.185.221.20:49485

Attributes

Install_directory
%Userprofile%
install_file
System.exe

Signatures

Detect Xworm Payload 2 IoCs

Processes:

resource	yara_rule
behavioral1/memory/4924-0-0x0000000000E20000-0x0000000000E3A000-memory.dmp	family_xworm
C:\Users\Admin\System	family_xworm

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

Drops startup file 2 IoCs

Processes:

Registry.exe

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

Executes dropped EXE 2 IoCs

Processes:

SystemSystem

pid process

4964 System
2736 System

Adds Run key to start application 2 TTPs 1 IoCs

Registry Run Keys / Startup Folder

Modify Registry

Processes:

Registry.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-4106386276-4127174233-3637007343-1000\Software\Microsoft\Windows\CurrentVersion\Run\System = "C:\\Users\\Admin\\System"	Registry.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.

Processes:

flow ioc

1 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

Processes:

schtasks.exe

pid process

924 schtasks.exe
Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

Registry.exe

pid process

4924 Registry.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

Registry.exeSystemSystem

description	pid	process
Token: SeDebugPrivilege	4924	Registry.exe
Token: SeDebugPrivilege	4924	Registry.exe
Token: SeDebugPrivilege	4964	System
Token: SeDebugPrivilege	2736	System

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Registry.exe

pid process

4924 Registry.exe

Suspicious use of WriteProcessMemory 2 IoCs

Processes:

Registry.exe

description	pid	process	target process
PID 4924 wrote to memory of 924	4924	Registry.exe	schtasks.exe
PID 4924 wrote to memory of 924	4924	Registry.exe	schtasks.exe

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\Registry.exe
"C:\Users\Admin\AppData\Local\Temp\Registry.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:4924

C:\Windows\System32\schtasks.exe
"C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "System" /tr "C:\Users\Admin\System"
2⤵
- Scheduled Task/Job: Scheduled Task
PID:924

C:\Users\Admin\System
C:\Users\Admin\System
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4964

C:\Users\Admin\System
C:\Users\Admin\System
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2736

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Scheduled Task/Job

Scheduled Task

Persistence

Boot or Logon Autostart Execution

Registry Run Keys / Startup Folder

Scheduled Task/Job

Scheduled Task

Privilege Escalation

Boot or Logon Autostart Execution

Registry Run Keys / Startup Folder

Scheduled Task/Job

Scheduled Task

Defense Evasion

Modify Registry

Credential Access

Discovery

System Information Discovery

Query Registry

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\System.log
Filesize
654B

MD5
16c5fce5f7230eea11598ec11ed42862

SHA1
75392d4824706090f5e8907eee1059349c927600

SHA256
87ba77c13905298acbac72be90949c4fe0755b6eff9777615aa37f252515f151

SHA512
153edd6da59beea6cc411ed7383c32916425d6ebb65f04c65aab7c1d6b25443d143aa8449aa92149de0ad8a975f6ecaa60f9f7574536eec6b38fe5fd3a6c6adc

Download Submit
C:\Users\Admin\System
Filesize
77KB

MD5
9d6650618c58c87940342a370a32e509

SHA1
c579fae20e78573deeec2059c8119083ccdff7e2

SHA256
b9254a6ecd096658f98b82ebb751201b4e447b5ce3b7302b48fb228c9b516c23

SHA512
d37b31b2c9669980279e2ebf247811ddd2f43231766a735b8a904dd9de1034e10a5fb7ee23c80717f88d5e173b0ee84ee890b95f50e71590b57e03d8b81d6020

Download Submit
memory/4924-0-0x0000000000E20000-0x0000000000E3A000-memory.dmp

Filesize
104KB

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memory/4924-1-0x00007FFFABA43000-0x00007FFFABA44000-memory.dmp

Filesize
4KB

Download
memory/4924-2-0x00007FFFABA40000-0x00007FFFAC42C000-memory.dmp

Filesize
9.9MB

Download
memory/4924-6-0x00007FFFABA43000-0x00007FFFABA44000-memory.dmp

Filesize
4KB

Download
memory/4924-7-0x00007FFFABA40000-0x00007FFFAC42C000-memory.dmp

Filesize
9.9MB

Download
memory/4964-11-0x00007FFFABA40000-0x00007FFFAC42C000-memory.dmp

Filesize
9.9MB

Download
memory/4964-13-0x00007FFFABA40000-0x00007FFFAC42C000-memory.dmp

Filesize
9.9MB

Download