xworm | f1019aa9fc34248f9a0fbb425d49b76fef4def91f83a72f7ccadb89a4b542c26

Analysis

max time kernel
8s
max time network
7s
platform
windows11-21h2_x64
resource
win11-20241007-en
resource tags

arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
submitted
05-11-2024 17:49

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General

Target

TaskHost.exe
Size

107KB
MD5

4d06963d7c33e9b7e2885ff12ea60e9d
SHA1

c6fcdc1f700a7acdf67116894cf615a57d8bcb3e
SHA256

f1019aa9fc34248f9a0fbb425d49b76fef4def91f83a72f7ccadb89a4b542c26
SHA512

c4ecc1e99b85548cb6c16a11aa0d0b4043fb1705a35990f658cab852537ee7240cbb33aa3c9d849477b14294188dd2e7a634f96f8a40a0358e96a2d5d0502c30
SSDEEP

1536:vVvKDxm/PBlYBe2qJU0F4AvGIXj4wNGtTkgP4kQx3T7sglLg2q85c/avK7R9q:d2x+Bl/8AvNFNGtTkgw/x3f7cjsiFk

Score

10^/10

xworm discovery rat trojan

Malware Config

Extracted

Family

xworm

93.123.109.89:7000

Attributes

Install_directory
%Temp%
install_file
BackgroundTaskHost.exe

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral1/memory/4668-5-0x0000000000910000-0x0000000000926000-memory.dmp	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm
Xworm family
xworm
Uses the VBS compiler for execution 1 TTPs

Command and Scripting Interpreter
T1059

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
1	ip-api.com

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4140 set thread context of 4668	4140	TaskHost.exe	80

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1040	4668	WerFault.exe	80

System Location Discovery: System Language Discovery 1 TTPs 2 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	TaskHost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vbc.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4668	vbc.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4140 wrote to memory of 4668	4140	TaskHost.exe	80
PID 4140 wrote to memory of 4668	4140	TaskHost.exe	80
PID 4140 wrote to memory of 4668	4140	TaskHost.exe	80
PID 4140 wrote to memory of 4668	4140	TaskHost.exe	80
PID 4140 wrote to memory of 4668	4140	TaskHost.exe	80
PID 4140 wrote to memory of 4668	4140	TaskHost.exe	80
PID 4140 wrote to memory of 4668	4140	TaskHost.exe	80
PID 4140 wrote to memory of 4668	4140	TaskHost.exe	80

C:\Users\Admin\AppData\Local\Temp\TaskHost.exe
"C:\Users\Admin\AppData\Local\Temp\TaskHost.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4140
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  PID:4668
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 4668 -s 1692
    3⤵
    - Program crash
    PID:1040

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 4668 -ip 4668
1⤵
PID:3164

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/4140-0-0x0000000074FCE000-0x0000000074FCF000-memory.dmp

Filesize
4KB

Download
memory/4140-1-0x00000000009E0000-0x0000000000A02000-memory.dmp

Filesize
136KB

Download
memory/4140-2-0x0000000005460000-0x00000000054C6000-memory.dmp

Filesize
408KB

Download
memory/4140-4-0x0000000074FC0000-0x0000000075771000-memory.dmp

Filesize
7.7MB

Download
memory/4140-10-0x0000000074FC0000-0x0000000075771000-memory.dmp

Filesize
7.7MB

Download
memory/4668-6-0x0000000004F00000-0x0000000004F9C000-memory.dmp

Filesize
624KB

Download
memory/4668-5-0x0000000000910000-0x0000000000926000-memory.dmp

Filesize
88KB

Download
memory/4668-7-0x0000000074FC0000-0x0000000075771000-memory.dmp

Filesize
7.7MB

Download
memory/4668-8-0x0000000074FC0000-0x0000000075771000-memory.dmp

Filesize
7.7MB

Download
memory/4668-9-0x0000000074FC0000-0x0000000075771000-memory.dmp

Filesize
7.7MB

Download