xworm | b6e701be7e9daca3ebad9a1586d75dfbd6ec66fd9b36b15459e9f16b73cfc3ca

General

Target

update.exe
Size

221KB
MD5

c2bc3732467892cdf222c9161773405a
SHA1

43770742e6a28930a1cc4e415e7e03df870c9e92
SHA256

b6e701be7e9daca3ebad9a1586d75dfbd6ec66fd9b36b15459e9f16b73cfc3ca
SHA512

6c9629df3de5ee640898d7abbb4f750df3e07c9e2d841a5597072ec2bd6662de552b75dc783761c0376bf44791a2d684a01a7f387d675674d87dc83fa6762ba1
SSDEEP

3072:Gj+C7lQ52Mrb/xqHuXxcKXnlzlbm9EHBAnpK37nXZ8j0uIQ7bnPs074tyJhXgK0J:o77MrQO58VxnPJqta

Score

10^/10

xworm execution rat trojan

Malware Config

Extracted

Family

xworm

Version

3.0

C2

147.185.221.26:27759

Mutex

39bfHGiD4o1FzWnH

Attributes

Install_directory
%Temp%
install_file
USB.exe

aes.plain

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral1/memory/2704-23-0x0000000000170000-0x000000000017E000-memory.dmp	family_xworm

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

Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
2060	powershell.exe
2776	powershell.exe

Executes dropped EXE 2 IoCs

pid	Process
2704	RtkAudUService64.exe
2036	RtkAudUService64.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\RtkAudUService64.exe	update.exe
File created	C:\Windows\RtkAudUService64.exe	update.exe

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
308	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2060	powershell.exe
2776	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	2620	update.exe
Token: SeDebugPrivilege	2060	powershell.exe
Token: SeDebugPrivilege	2776	powershell.exe
Token: SeDebugPrivilege	2704	RtkAudUService64.exe
Token: SeDebugPrivilege	2704	RtkAudUService64.exe
Token: SeDebugPrivilege	2036	RtkAudUService64.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2620 wrote to memory of 2060	2620	update.exe	30
PID 2620 wrote to memory of 2060	2620	update.exe	30
PID 2620 wrote to memory of 2060	2620	update.exe	30
PID 2620 wrote to memory of 2776	2620	update.exe	32
PID 2620 wrote to memory of 2776	2620	update.exe	32
PID 2620 wrote to memory of 2776	2620	update.exe	32
PID 2716 wrote to memory of 2704	2716	taskeng.exe	36
PID 2716 wrote to memory of 2704	2716	taskeng.exe	36
PID 2716 wrote to memory of 2704	2716	taskeng.exe	36
PID 2704 wrote to memory of 308	2704	RtkAudUService64.exe	37
PID 2704 wrote to memory of 308	2704	RtkAudUService64.exe	37
PID 2704 wrote to memory of 308	2704	RtkAudUService64.exe	37
PID 2716 wrote to memory of 2036	2716	taskeng.exe	40
PID 2716 wrote to memory of 2036	2716	taskeng.exe	40
PID 2716 wrote to memory of 2036	2716	taskeng.exe	40

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\update.exe
"C:\Users\Admin\AppData\Local\Temp\update.exe"
1⤵
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2620
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Windows\RtkAudUService64.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2060
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'RtkAudUService64.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2776

C:\Windows\system32\taskeng.exe
taskeng.exe {97195EFA-8A5C-45EC-BD0A-7EACD9AC48D1} S-1-5-21-2039016743-699959520-214465309-1000:PIDEURYY\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2716
- C:\Windows\RtkAudUService64.exe
  C:\Windows\RtkAudUService64.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2704
- - C:\Windows\System32\schtasks.exe
    "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "RtkAudUService64" /tr "C:\Users\Admin\AppData\Local\Temp\RtkAudUService64.exe"
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:308
- C:\Users\Admin\AppData\Local\Temp\RtkAudUService64.exe
  C:\Users\Admin\AppData\Local\Temp\RtkAudUService64.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2036

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

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

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\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
bdd26cea462a15d44abfd52c6d833689

SHA1
3262033ffd9fab1cd5134b05bfdec12478e81424

SHA256
927ea7b7a13baa0b9db0e9a28d55554b9320eeb5eae9ab68729b95d3b804b158

SHA512
c3cadc5a4d1ed16e8ff2da507f47f828daba7ec54cb6aa4204ef80d93be6694262f452c72dccaa421a5f93476cc1250fd01db1126ae712bfb293c1d61af4970b

Download Submit
C:\Windows\RtkAudUService64.exe

Filesize
221KB

MD5
c2bc3732467892cdf222c9161773405a

SHA1
43770742e6a28930a1cc4e415e7e03df870c9e92

SHA256
b6e701be7e9daca3ebad9a1586d75dfbd6ec66fd9b36b15459e9f16b73cfc3ca

SHA512
6c9629df3de5ee640898d7abbb4f750df3e07c9e2d841a5597072ec2bd6662de552b75dc783761c0376bf44791a2d684a01a7f387d675674d87dc83fa6762ba1

Download Submit
memory/2036-28-0x0000000000A90000-0x0000000000ACE000-memory.dmp

Filesize
248KB

Download
memory/2060-7-0x000000001B530000-0x000000001B812000-memory.dmp

Filesize
2.9MB

Download
memory/2060-8-0x0000000001F00000-0x0000000001F08000-memory.dmp

Filesize
32KB

Download
memory/2060-6-0x0000000002A00000-0x0000000002A80000-memory.dmp

Filesize
512KB

Download
memory/2620-0-0x000007FEF5923000-0x000007FEF5924000-memory.dmp

Filesize
4KB

Download
memory/2620-18-0x000000001AFD0000-0x000000001B050000-memory.dmp

Filesize
512KB

Download
memory/2620-1-0x0000000000380000-0x00000000003BE000-memory.dmp

Filesize
248KB

Download
memory/2704-22-0x0000000001110000-0x000000000114E000-memory.dmp

Filesize
248KB

Download
memory/2704-23-0x0000000000170000-0x000000000017E000-memory.dmp

Filesize
56KB

Download
memory/2776-14-0x000000001B730000-0x000000001BA12000-memory.dmp

Filesize
2.9MB

Download
memory/2776-15-0x0000000000650000-0x0000000000658000-memory.dmp

Filesize
32KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads