xworm | 4b9d11ad0a32fd2d76d4d8e9256f13df37b7628df9eb50b21dd11016d0a4ca22

Analysis

max time kernel
137s
max time network
150s
platform
windows7_x64
resource
win7-20230220-en
resource tags

arch:x64arch:x86image:win7-20230220-enlocale:en-usos:windows7-x64system
submitted
17-03-2023 14:03

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General

Target

fleint.exe
Size

66KB
MD5

8682c4dc2e3ae57079e9ada0943b813d
SHA1

d855ac963756f24d67297c1c9b94b86d6e5350ba
SHA256

4b9d11ad0a32fd2d76d4d8e9256f13df37b7628df9eb50b21dd11016d0a4ca22
SHA512

a7eb2a5db32d0b96e0bc761454bf9bc40bde24ff8a6eab52c799d6438c2e64d1b0fb914a75b34256e488f76b9ec7423eea82537a772f599b8e02e8199c8e5ace
SSDEEP

1536:Yd077VI2kTksimD7A9sb0sBmaOu8EJSRK:Z9kT5imD7Osb0umaOuxGK

Score

10^/10

xworm persistence rat trojan

Malware Config

Signatures

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

Drops startup file 2 IoCs

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

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1563773381-2037468142-1146002597-1000\Software\Microsoft\Windows\CurrentVersion\Run\fleint = "C:\\Users\\Admin\\AppData\\Roaming\\fleint.exe"	fleint.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
3	ip-api.com

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

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

T1053

pid	Process
1720	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1120	fleint.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1120	fleint.exe
Token: SeDebugPrivilege	1120	fleint.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1120	fleint.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 1120 wrote to memory of 1720	1120	fleint.exe	28
PID 1120 wrote to memory of 1720	1120	fleint.exe	28
PID 1120 wrote to memory of 1720	1120	fleint.exe	28

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\fleint.exe
"C:\Users\Admin\AppData\Local\Temp\fleint.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:1120
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "fleint" /tr "C:\Users\Admin\AppData\Roaming\fleint.exe"
  2⤵
  - Creates scheduled task(s)
  PID:1720

C:\Windows\system32\taskeng.exe
taskeng.exe {EB028B2B-76B5-44AA-B166-EDE649B88B75} S-1-5-21-1563773381-2037468142-1146002597-1000:YBHADZIG\Admin:Interactive:[1]
1⤵
PID:1792

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Registry Run Keys / Startup Folder

T1060

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1120-54-0x0000000000C50000-0x0000000000C66000-memory.dmp

Filesize
88KB

Download
memory/1120-55-0x000000001ACE0000-0x000000001AD60000-memory.dmp

Filesize
512KB

Download
memory/1120-59-0x000000001ACE0000-0x000000001AD60000-memory.dmp

Filesize
512KB

Download