xworm | e73c96538ec60c2117b6ed82b7f95f8894abed022ee9ab03c1be90ebd9722f06

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

C2

SLL.casacam.net:4444

Attributes

Install_directory
%LocalAppData%
install_file
Interrupi.exe

aes.plain

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral5/memory/4768-2-0x000000001B570000-0x000000001B588000-memory.dmp	family_xworm
behavioral5/memory/4768-4-0x000000001B600000-0x000000001B614000-memory.dmp	family_xworm

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

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	ss32.exe

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 5 IoCs

pid	Process
3212	Interrupi.exe
3264	Interrupi.exe
3548	Interrupi.exe
5028	Interrupi.exe
4468	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-1-5-21-3756129449-3121373848-4276368241-1000\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 10 IoCs

Web Service

T1102

flow	ioc
90	4.tcp.eu.ngrok.io
19	pastebin.com
20	pastebin.com
35	4.tcp.eu.ngrok.io
72	4.tcp.eu.ngrok.io
76	4.tcp.eu.ngrok.io
21	4.tcp.eu.ngrok.io
49	4.tcp.eu.ngrok.io
70	4.tcp.eu.ngrok.io
100	4.tcp.eu.ngrok.io

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
456	schtasks.exe

Suspicious behavior: AddClipboardFormatListener 2 IoCs

pid	Process
4768	ss32.exe
4768	ss32.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	4768	ss32.exe
Token: SeDebugPrivilege	4768	ss32.exe
Token: SeDebugPrivilege	3212	Interrupi.exe
Token: SeDebugPrivilege	3264	Interrupi.exe
Token: SeDebugPrivilege	3548	Interrupi.exe
Token: SeDebugPrivilege	5028	Interrupi.exe
Token: SeDebugPrivilege	4468	Interrupi.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 4768 wrote to memory of 456	4768	ss32.exe	82
PID 4768 wrote to memory of 456	4768	ss32.exe	82

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⤵
- Checks computer location settings
- Drops startup file
- Adds Run key to start application
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4768
- 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:456

C:\Users\Admin\AppData\Local\Interrupi.exe
C:\Users\Admin\AppData\Local\Interrupi.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3212

C:\Users\Admin\AppData\Local\Interrupi.exe
C:\Users\Admin\AppData\Local\Interrupi.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3264

C:\Users\Admin\AppData\Local\Interrupi.exe
C:\Users\Admin\AppData\Local\Interrupi.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3548

C:\Users\Admin\AppData\Local\Interrupi.exe
C:\Users\Admin\AppData\Local\Interrupi.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:5028

C:\Users\Admin\AppData\Local\Interrupi.exe
C:\Users\Admin\AppData\Local\Interrupi.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4468

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

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

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

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

Filesize
660B

MD5
1c5e1d0ff3381486370760b0f2eb656b

SHA1
f9df6be8804ef611063f1ff277e323b1215372de

SHA256
f424c891fbc7385e9826beed2dd8755aeac5495744b5de0a1e370891a7beaf7a

SHA512
78f5fc40a185d04c9e4a02a3d1b10b4bd684c579a45a0d1e8f49f8dee9018ed7bc8875cbf21f98632f93ead667214a41904226ce54817b85caeeb4b0de54a743

Download Submit
memory/3212-13-0x00007FF81A2E0000-0x00007FF81ADA1000-memory.dmp

Filesize
10.8MB

Download
memory/3212-15-0x00007FF81A2E0000-0x00007FF81ADA1000-memory.dmp

Filesize
10.8MB

Download
memory/4768-0-0x00007FF81A2E3000-0x00007FF81A2E5000-memory.dmp

Filesize
8KB

Download
memory/4768-1-0x0000000000A00000-0x0000000000A1E000-memory.dmp

Filesize
120KB

Download
memory/4768-2-0x000000001B570000-0x000000001B588000-memory.dmp

Filesize
96KB

Download
memory/4768-3-0x00007FF81A2E0000-0x00007FF81ADA1000-memory.dmp

Filesize
10.8MB

Download
memory/4768-4-0x000000001B600000-0x000000001B614000-memory.dmp

Filesize
80KB

Download
memory/4768-9-0x00007FF81A2E3000-0x00007FF81A2E5000-memory.dmp

Filesize
8KB

Download
memory/4768-10-0x00007FF81A2E0000-0x00007FF81ADA1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads