xworm | e73c96538ec60c2117b6ed82b7f95f8894abed022ee9ab03c1be90ebd9722f06

Analysis

max time kernel
149s
max time network
154s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
09-12-2024 23:08

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General

Target

ss32.exe
Size

94KB
MD5

cbe1be5547cc26f924d6fa48b4abca92
SHA1

972f9afdb39425a4764be0a91552613e49eba7f3
SHA256

549565dab31274ecd5370f02766116260e56390b405231ddaf3a7186395f1d9f
SHA512

be567464ab80a4c00f7b499c1b645cf2ef301242a5feffad1b6dca8b2281f066a9f0ae63fbf8715c3e3c3b0dc6c8e1093d057ff245c5de5f8b39da37eb56a272
SSDEEP

1536:GW4ZYDn38RoEv9fEonXRyoZX7rhC5Hg4P0lALoVrZ+hR40qvUusn47k:GW4Zs38pvBXn/nhgHg43LsUnqMusn47k

Score

10^/10

xworm persistence rat trojan

Malware Config

Extracted

Family

xworm

SLL.casacam.net:4444

Attributes

Install_directory
%LocalAppData%
install_file
Interrupi.exe

aes.plain

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral9/memory/2076-2-0x0000000000BE0000-0x0000000000BF8000-memory.dmp	family_xworm
behavioral9/memory/2076-4-0x0000000001160000-0x0000000001174000-memory.dmp	family_xworm

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

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Interrupi.lnk	ss32.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Interrupi.lnk	ss32.exe

Executes dropped EXE 3 IoCs

pid	Process
2680	Interrupi.exe
2948	Interrupi.exe
896	Interrupi.exe

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-1-5-21-4177215427-74451935-3209572229-1000\Software\Microsoft\Windows\CurrentVersion\Run\Interrupi = "C:\\Users\\Admin\\AppData\\Local\\Interrupi.exe"	ss32.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 5 IoCs

Web Service

T1102

flow	ioc
8	pastebin.com
9	pastebin.com
10	4.tcp.eu.ngrok.io
25	4.tcp.eu.ngrok.io
41	4.tcp.eu.ngrok.io

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

System Information Discovery
T1082

Modifies system certificate store 2 TTPs 2 IoCs

evasion spyware trojan

Install Root Certificate

T1553.004

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\ROOT\Certificates\CABD2A79A1076A31F21D253635CB039D4329A5E8	ss32.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\ROOT\Certificates\CABD2A79A1076A31F21D253635CB039D4329A5E8\Blob = 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	ss32.exe

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
2908	schtasks.exe

Suspicious behavior: AddClipboardFormatListener 2 IoCs

pid	Process
2076	ss32.exe
2076	ss32.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	2076	ss32.exe
Token: SeDebugPrivilege	2076	ss32.exe
Token: SeDebugPrivilege	2680	Interrupi.exe
Token: SeDebugPrivilege	2948	Interrupi.exe
Token: SeDebugPrivilege	896	Interrupi.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 2076 wrote to memory of 2908	2076	ss32.exe	31
PID 2076 wrote to memory of 2908	2076	ss32.exe	31
PID 2076 wrote to memory of 2908	2076	ss32.exe	31
PID 2868 wrote to memory of 2680	2868	taskeng.exe	35
PID 2868 wrote to memory of 2680	2868	taskeng.exe	35
PID 2868 wrote to memory of 2680	2868	taskeng.exe	35
PID 2868 wrote to memory of 2948	2868	taskeng.exe	36
PID 2868 wrote to memory of 2948	2868	taskeng.exe	36
PID 2868 wrote to memory of 2948	2868	taskeng.exe	36
PID 2868 wrote to memory of 896	2868	taskeng.exe	37
PID 2868 wrote to memory of 896	2868	taskeng.exe	37
PID 2868 wrote to memory of 896	2868	taskeng.exe	37

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\ss32.exe
"C:\Users\Admin\AppData\Local\Temp\ss32.exe"
1⤵
- Drops startup file
- Adds Run key to start application
- Modifies system certificate store
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2076
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "Interrupi" /tr "C:\Users\Admin\AppData\Local\Interrupi.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2908

C:\Windows\system32\taskeng.exe
taskeng.exe {C8AE8A4A-579A-477A-B378-2A4D485F4917} S-1-5-21-4177215427-74451935-3209572229-1000:JSMURNPT\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2868
- C:\Users\Admin\AppData\Local\Interrupi.exe
  C:\Users\Admin\AppData\Local\Interrupi.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2680
- C:\Users\Admin\AppData\Local\Interrupi.exe
  C:\Users\Admin\AppData\Local\Interrupi.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2948
- C:\Users\Admin\AppData\Local\Interrupi.exe
  C:\Users\Admin\AppData\Local\Interrupi.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:896

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Modify Registry

T1112

Subvert Trust Controls

T1553

Install Root Certificate

T1553.004

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Interrupi.exe

Filesize
94KB

MD5
cbe1be5547cc26f924d6fa48b4abca92

SHA1
972f9afdb39425a4764be0a91552613e49eba7f3

SHA256
549565dab31274ecd5370f02766116260e56390b405231ddaf3a7186395f1d9f

SHA512
be567464ab80a4c00f7b499c1b645cf2ef301242a5feffad1b6dca8b2281f066a9f0ae63fbf8715c3e3c3b0dc6c8e1093d057ff245c5de5f8b39da37eb56a272

Download Submit
memory/2076-0-0x000007FEF5FE3000-0x000007FEF5FE4000-memory.dmp

Filesize
4KB

Download
memory/2076-1-0x0000000001170000-0x000000000118E000-memory.dmp

Filesize
120KB

Download
memory/2076-2-0x0000000000BE0000-0x0000000000BF8000-memory.dmp

Filesize
96KB

Download
memory/2076-3-0x000007FEF5FE0000-0x000007FEF69CC000-memory.dmp

Filesize
9.9MB

Download
memory/2076-4-0x0000000001160000-0x0000000001174000-memory.dmp

Filesize
80KB

Download
memory/2076-9-0x000007FEF5FE3000-0x000007FEF5FE4000-memory.dmp

Filesize
4KB

Download
memory/2076-10-0x000007FEF5FE0000-0x000007FEF69CC000-memory.dmp

Filesize
9.9MB

Download
memory/2680-14-0x00000000013C0000-0x00000000013DE000-memory.dmp

Filesize
120KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads