xworm | c351ff303cfa1788ffb81e64a468871cb243a406d5c8fa2f6ddebba52c5198c0

General

Target

Chrome.exe
Size

173KB
MD5

3c7921e1847c67e0ea2e405dc6d39cd5
SHA1

3c8307af1999b5c404208a6f99feda968f51e9e7
SHA256

c351ff303cfa1788ffb81e64a468871cb243a406d5c8fa2f6ddebba52c5198c0
SHA512

685a3a564e78383a44aaaca72302b2c07e260800f9dd7279812102eb759932d33898b575243fd9c0169b80901ceb63b0bce592b65eae2639268f74c136c23bd2
SSDEEP

3072:WhNXZCckbL38bKROG7/4NpVq8BxFRzaqF+o2GQJ7/JzqVfGv8:ipCPb78OgVqwlL

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Attributes

Install_directory
%Userprofile%
install_file
USB.exe
pastebin_url
https://pastebin.com/raw/sr6XiLTF

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral1/memory/2220-1-0x0000000000910000-0x0000000000942000-memory.dmp	family_xworm
behavioral1/files/0x002000000002af94-56.dat	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 4 IoCs

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

execution

PowerShell

T1059.001

pid	Process
2040	powershell.exe
3316	powershell.exe
2320	powershell.exe
984	powershell.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\RtkAudUService64.lnk	Chrome.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\RtkAudUService64.lnk	Chrome.exe

Executes dropped EXE 1 IoCs

pid	Process
2112	RtkAudUService64

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2081498128-3109241912-2948996266-1000\Software\Microsoft\Windows\CurrentVersion\Run\RtkAudUService64 = "C:\\Users\\Admin\\RtkAudUService64"	Chrome.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
1	pastebin.com
2	pastebin.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

pid	Process
1756	schtasks.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
2040	powershell.exe
2040	powershell.exe
3316	powershell.exe
3316	powershell.exe
2320	powershell.exe
2320	powershell.exe
984	powershell.exe
984	powershell.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	2220	Chrome.exe
Token: SeDebugPrivilege	2040	powershell.exe
Token: SeDebugPrivilege	3316	powershell.exe
Token: SeDebugPrivilege	2320	powershell.exe
Token: SeDebugPrivilege	984	powershell.exe
Token: SeDebugPrivilege	2220	Chrome.exe
Token: SeDebugPrivilege	2112	RtkAudUService64

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2220 wrote to memory of 2040	2220	Chrome.exe	83
PID 2220 wrote to memory of 2040	2220	Chrome.exe	83
PID 2220 wrote to memory of 3316	2220	Chrome.exe	85
PID 2220 wrote to memory of 3316	2220	Chrome.exe	85
PID 2220 wrote to memory of 2320	2220	Chrome.exe	87
PID 2220 wrote to memory of 2320	2220	Chrome.exe	87
PID 2220 wrote to memory of 984	2220	Chrome.exe	89
PID 2220 wrote to memory of 984	2220	Chrome.exe	89
PID 2220 wrote to memory of 1756	2220	Chrome.exe	91
PID 2220 wrote to memory of 1756	2220	Chrome.exe	91

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\Chrome.exe
"C:\Users\Admin\AppData\Local\Temp\Chrome.exe"
1⤵
- Drops startup file
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2220
- 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\Chrome.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2040
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Chrome.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3316
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\RtkAudUService64'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2320
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'RtkAudUService64'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:984
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "RtkAudUService64" /tr "C:\Users\Admin\RtkAudUService64"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1756

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c C:\Users\Admin\RtkAudUService64
1⤵
PID:4024

C:\Users\Admin\RtkAudUService64
C:\Users\Admin\RtkAudUService64
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2112

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

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
627073ee3ca9676911bee35548eff2b8

SHA1
4c4b68c65e2cab9864b51167d710aa29ebdcff2e

SHA256
85b280a39fc31ba1e15fb06102a05b8405ff3b82feb181d4170f04e466dd647c

SHA512
3c5f6c03e253b83c57e8d6f0334187dbdcdf4fa549eecd36cbc1322dca6d3ca891dc6a019c49ec2eafb88f82d0434299c31e4dfaab123acb42e0546218f311fb

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
aa4f31835d07347297d35862c9045f4a

SHA1
83e728008935d30f98e5480fba4fbccf10cefb05

SHA256
99c83bc5c531e49d4240700142f3425aba74e18ebcc23556be32238ffde9cce0

SHA512
ec3a4bee8335007b8753ae8ac42287f2b3bcbb258f7fc3fb15c9f8d3e611cb9bf6ae2d3034953286a34f753e9ec33f7495e064bab0e8c7fcedd75d6e5eb66629

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
1189a72e42e2321edf1ed3a8d5568687

SHA1
a2142fc754d6830de107d9d46f398483156f16a6

SHA256
009aee0a5f2d25ed79160e75cde58722def11663334ed20283e3afca32f971ea

SHA512
b1eb9b7aa7a57d0acec93b8152229b1f274a8d1b8f19133513486587f39b0636a9df89ddc6c2013e001d831f2b23cd0bb0fc084131824ea8e1dff134cd6d4f29

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
aa98c40a0415c84028e0f0b08c899c5f

SHA1
5f21e4ee4d75d9145d142b0ed7545d103ac81b0c

SHA256
fea14761d53c28997e084feebf3604e76680586f7951eded122e69a3d1d9d31b

SHA512
3afb5be69fcc456cb7fea5543e28ef7fc17e73d93520affeda7be553415097f9be799f457c2f820216b6bc38f9c05e281d34891cd573ff6c54bc08438cfd5367

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ech1mjor.svu.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\RtkAudUService64

Filesize
173KB

MD5
3c7921e1847c67e0ea2e405dc6d39cd5

SHA1
3c8307af1999b5c404208a6f99feda968f51e9e7

SHA256
c351ff303cfa1788ffb81e64a468871cb243a406d5c8fa2f6ddebba52c5198c0

SHA512
685a3a564e78383a44aaaca72302b2c07e260800f9dd7279812102eb759932d33898b575243fd9c0169b80901ceb63b0bce592b65eae2639268f74c136c23bd2

Download Submit
memory/2040-11-0x00007FFDD47D0000-0x00007FFDD5292000-memory.dmp

Filesize
10.8MB

Download
memory/2040-14-0x00007FFDD47D0000-0x00007FFDD5292000-memory.dmp

Filesize
10.8MB

Download
memory/2040-15-0x00007FFDD47D0000-0x00007FFDD5292000-memory.dmp

Filesize
10.8MB

Download
memory/2040-18-0x00007FFDD47D0000-0x00007FFDD5292000-memory.dmp

Filesize
10.8MB

Download
memory/2040-13-0x00007FFDD47D0000-0x00007FFDD5292000-memory.dmp

Filesize
10.8MB

Download
memory/2040-12-0x00007FFDD47D0000-0x00007FFDD5292000-memory.dmp

Filesize
10.8MB

Download
memory/2040-10-0x0000022048960000-0x0000022048982000-memory.dmp

Filesize
136KB

Download
memory/2220-0-0x00007FFDD47D3000-0x00007FFDD47D5000-memory.dmp

Filesize
8KB

Download
memory/2220-53-0x00007FFDD47D3000-0x00007FFDD47D5000-memory.dmp

Filesize
8KB

Download
memory/2220-54-0x00007FFDD47D0000-0x00007FFDD5292000-memory.dmp

Filesize
10.8MB

Download
memory/2220-55-0x00007FFDD47D0000-0x00007FFDD5292000-memory.dmp

Filesize
10.8MB

Download
memory/2220-1-0x0000000000910000-0x0000000000942000-memory.dmp

Filesize
200KB

Download

Resubmissions

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads