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/2848-1-0x0000000000220000-0x0000000000252000-memory.dmp	family_xworm
behavioral1/files/0x001d00000000f460-57.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
3968	powershell.exe
5024	powershell.exe
2360	powershell.exe
4540	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 14 IoCs

pid	Process
5364	RtkAudUService64
4384	RtkAudUService64
2300	RtkAudUService64
656	RtkAudUService64
960	RtkAudUService64
2220	RtkAudUService64
4956	RtkAudUService64
4792	RtkAudUService64
1936	RtkAudUService64
5052	RtkAudUService64
1072	RtkAudUService64
3508	RtkAudUService64
6124	RtkAudUService64
1956	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-1-5-21-3712238951-2226310826-298817577-1000\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
5256	schtasks.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
5024	powershell.exe
5024	powershell.exe
2360	powershell.exe
2360	powershell.exe
4540	powershell.exe
4540	powershell.exe
3968	powershell.exe
3968	powershell.exe

Suspicious use of AdjustPrivilegeToken 20 IoCs

description	pid	Process
Token: SeDebugPrivilege	2848	Chrome.exe
Token: SeDebugPrivilege	5024	powershell.exe
Token: SeDebugPrivilege	2360	powershell.exe
Token: SeDebugPrivilege	4540	powershell.exe
Token: SeDebugPrivilege	3968	powershell.exe
Token: SeDebugPrivilege	2848	Chrome.exe
Token: SeDebugPrivilege	5364	RtkAudUService64
Token: SeDebugPrivilege	4384	RtkAudUService64
Token: SeDebugPrivilege	2300	RtkAudUService64
Token: SeDebugPrivilege	656	RtkAudUService64
Token: SeDebugPrivilege	960	RtkAudUService64
Token: SeDebugPrivilege	2220	RtkAudUService64
Token: SeDebugPrivilege	4956	RtkAudUService64
Token: SeDebugPrivilege	4792	RtkAudUService64
Token: SeDebugPrivilege	1936	RtkAudUService64
Token: SeDebugPrivilege	5052	RtkAudUService64
Token: SeDebugPrivilege	1072	RtkAudUService64
Token: SeDebugPrivilege	3508	RtkAudUService64
Token: SeDebugPrivilege	6124	RtkAudUService64
Token: SeDebugPrivilege	1956	RtkAudUService64

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2848 wrote to memory of 5024	2848	Chrome.exe	83
PID 2848 wrote to memory of 5024	2848	Chrome.exe	83
PID 2848 wrote to memory of 2360	2848	Chrome.exe	85
PID 2848 wrote to memory of 2360	2848	Chrome.exe	85
PID 2848 wrote to memory of 4540	2848	Chrome.exe	87
PID 2848 wrote to memory of 4540	2848	Chrome.exe	87
PID 2848 wrote to memory of 3968	2848	Chrome.exe	89
PID 2848 wrote to memory of 3968	2848	Chrome.exe	89
PID 2848 wrote to memory of 5256	2848	Chrome.exe	91
PID 2848 wrote to memory of 5256	2848	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:2848
- 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:5024
- 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:2360
- 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:4540
- 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:3968
- 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:5256

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c C:\Users\Admin\RtkAudUService64
1⤵
PID:6020

C:\Users\Admin\RtkAudUService64
C:\Users\Admin\RtkAudUService64
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:5364

C:\Users\Admin\RtkAudUService64
C:\Users\Admin\RtkAudUService64
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4384

C:\Users\Admin\RtkAudUService64
C:\Users\Admin\RtkAudUService64
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2300

C:\Users\Admin\RtkAudUService64
C:\Users\Admin\RtkAudUService64
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:656

C:\Users\Admin\RtkAudUService64
C:\Users\Admin\RtkAudUService64
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:960

C:\Users\Admin\RtkAudUService64
C:\Users\Admin\RtkAudUService64
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2220

C:\Users\Admin\RtkAudUService64
C:\Users\Admin\RtkAudUService64
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4956

C:\Users\Admin\RtkAudUService64
C:\Users\Admin\RtkAudUService64
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4792

C:\Users\Admin\RtkAudUService64
C:\Users\Admin\RtkAudUService64
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1936

C:\Users\Admin\RtkAudUService64
C:\Users\Admin\RtkAudUService64
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:5052

C:\Users\Admin\RtkAudUService64
C:\Users\Admin\RtkAudUService64
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1072

C:\Users\Admin\RtkAudUService64
C:\Users\Admin\RtkAudUService64
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3508

C:\Users\Admin\RtkAudUService64
C:\Users\Admin\RtkAudUService64
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:6124

C:\Users\Admin\RtkAudUService64
C:\Users\Admin\RtkAudUService64
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1956

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\RtkAudUService64.log

Filesize
654B

MD5
2cbbb74b7da1f720b48ed31085cbd5b8

SHA1
79caa9a3ea8abe1b9c4326c3633da64a5f724964

SHA256
e31b18f21621d9983bfdf1ea3e53884a9d58b8ffd79e0e5790da6f3a81a8b9d3

SHA512
ecf02d5240e0c1c005d3ab393aa7eff62bd498c2db5905157e2bf6d29e1b663228a9583950842629d1a4caef404c8941a0c7799b1a3bd1eb890a09fdb7efcff9

Download Submit
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
1a9fa92a4f2e2ec9e244d43a6a4f8fb9

SHA1
9910190edfaccece1dfcc1d92e357772f5dae8f7

SHA256
0ee052d5333fd5fd86bc84856fec98e045f077a7ac8051651bf7c521b9706888

SHA512
5d2361476fa22200e6f83883efe7dcb8c3fe7dae8d56e04e28a36e9ae1270c327b6aa161d92b239593da7661289d002c574446ecfd6bd19928209aae25e3ef64

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

Filesize
944B

MD5
906523560f8af295fe0b398799658002

SHA1
b6b3d1f077ae0c39ac71d138630744856c0e424d

SHA256
9f1750afbd8fd87ce27d8ecb32a9dfc9247ca360055a34fb25780c3685995ced

SHA512
4dacd67d05b3648ce9ec59833aeca1c4683e25a8c0ab13297bede5168487e3c9a0608b9c93bb4e3baa2bd3a5414672f62c55b7386813d814e2cb44cd926f566b

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

Filesize
944B

MD5
60915306363d32ffdd43917c368ae931

SHA1
c7ad2570445eb9c6a71b47a2a868233618552b3b

SHA256
7b73f79b555011a4cd172773eb99f3e528808bee69a88e206718a1487f129230

SHA512
f43f4ad6a8a4687cfa85e933a0b32ed56f9d7254a9ef4f8e56b6331454a729986ce78d367d6045e6aae7bc27165a94d1eab44b40cc1c4bbefbd94a4b6633cd07

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_oxp0mpg4.k41.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/2848-1-0x0000000000220000-0x0000000000252000-memory.dmp

Filesize
200KB

Download
memory/2848-0-0x00007FFABFA73000-0x00007FFABFA75000-memory.dmp

Filesize
8KB

Download
memory/2848-55-0x00007FFABFA70000-0x00007FFAC0532000-memory.dmp

Filesize
10.8MB

Download
memory/2848-54-0x00007FFABFA70000-0x00007FFAC0532000-memory.dmp

Filesize
10.8MB

Download
memory/2848-53-0x00007FFABFA73000-0x00007FFABFA75000-memory.dmp

Filesize
8KB

Download
memory/5024-11-0x00007FFABFA70000-0x00007FFAC0532000-memory.dmp

Filesize
10.8MB

Download
memory/5024-18-0x00007FFABFA70000-0x00007FFAC0532000-memory.dmp

Filesize
10.8MB

Download
memory/5024-15-0x00007FFABFA70000-0x00007FFAC0532000-memory.dmp

Filesize
10.8MB

Download
memory/5024-14-0x00007FFABFA70000-0x00007FFAC0532000-memory.dmp

Filesize
10.8MB

Download
memory/5024-13-0x00007FFABFA70000-0x00007FFAC0532000-memory.dmp

Filesize
10.8MB

Download
memory/5024-12-0x00007FFABFA70000-0x00007FFAC0532000-memory.dmp

Filesize
10.8MB

Download
memory/5024-2-0x00000221EA990000-0x00000221EA9B2000-memory.dmp

Filesize
136KB

Download

Resubmissions

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads