xworm | e3124c7431ae62c1d0c7e508e318ac091e240cddfe00f768583fa496afa69bf8

General

Target

Krampus/23vcD1orbL.exe
Size

1.3MB
MD5

d48c30f50906d73b06aabec4a3c0ef96
SHA1

4ed2965e2c48d3e35a3e4e1ea8781d3761de94a5
SHA256

71015901a4bbe9f7f81a3f899bf7c21ceca2a332e272e31a4d6d2b6b4f71a59f
SHA512

71eb7ca54f7f1019716c9e5a323d0ffa892a6485fe387044deb9fe431e809bd2f8be5e35f3aba185eb53d437fc63a5a66704815b612e6ea960220610d459265f
SSDEEP

1536:c/G4iM3eweCmtR8K/ddBNm/LBOK+kAYxQb1biW3+FQxEfOO701d67/fxU9:cOrZ8kyt3AYeb1WRSEfO1vd9

Score

10^/10

xworm persistence rat trojan

Malware Config

Extracted

Family

xworm

Attributes

Install_directory
%ProgramData%
install_file
svchost.exe
pastebin_url
https://pastebin.com/raw/z5PQ82wE

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral1/memory/4996-0-0x0000000000BE0000-0x0000000000BFC000-memory.dmp	family_xworm
behavioral1/files/0x000200000002a774-9.dat	family_xworm

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

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\svchost.lnk	23vcD1orbL.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\svchost.lnk	23vcD1orbL.exe

Executes dropped EXE 2 IoCs

pid	Process
988	svchost.exe
2444	svchost.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-1-5-21-2567984660-2719943099-2683635618-1000\Software\Microsoft\Windows\CurrentVersion\Run\svchost = "C:\\ProgramData\\svchost.exe"	23vcD1orbL.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 4 IoCs

Web Service

T1102

flow	ioc
1	pastebin.com
1	5.tcp.eu.ngrok.io
3	pastebin.com
4	5.tcp.eu.ngrok.io

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
1	ip-api.com

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
3648	schtasks.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
4996	23vcD1orbL.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
4996	23vcD1orbL.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	4996	23vcD1orbL.exe
Token: SeDebugPrivilege	4996	23vcD1orbL.exe
Token: SeDebugPrivilege	988	svchost.exe
Token: SeDebugPrivilege	2444	svchost.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4996	23vcD1orbL.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 4996 wrote to memory of 3648	4996	23vcD1orbL.exe	77
PID 4996 wrote to memory of 3648	4996	23vcD1orbL.exe	77

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\Krampus\23vcD1orbL.exe
"C:\Users\Admin\AppData\Local\Temp\Krampus\23vcD1orbL.exe"
1⤵
- Drops startup file
- Adds Run key to start application
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4996
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "svchost" /tr "C:\ProgramData\svchost.exe"
  2⤵
  - Creates scheduled task(s)
  PID:3648

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:1324

C:\ProgramData\svchost.exe
C:\ProgramData\svchost.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:988

C:\ProgramData\svchost.exe
C:\ProgramData\svchost.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2444

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

Scheduled Task/Job

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

Scheduled Task/Job

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:\ProgramData\svchost.exe

Filesize
1.3MB

MD5
d48c30f50906d73b06aabec4a3c0ef96

SHA1
4ed2965e2c48d3e35a3e4e1ea8781d3761de94a5

SHA256
71015901a4bbe9f7f81a3f899bf7c21ceca2a332e272e31a4d6d2b6b4f71a59f

SHA512
71eb7ca54f7f1019716c9e5a323d0ffa892a6485fe387044deb9fe431e809bd2f8be5e35f3aba185eb53d437fc63a5a66704815b612e6ea960220610d459265f

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\svchost.exe.log

Filesize
654B

MD5
2cbbb74b7da1f720b48ed31085cbd5b8

SHA1
79caa9a3ea8abe1b9c4326c3633da64a5f724964

SHA256
e31b18f21621d9983bfdf1ea3e53884a9d58b8ffd79e0e5790da6f3a81a8b9d3

SHA512
ecf02d5240e0c1c005d3ab393aa7eff62bd498c2db5905157e2bf6d29e1b663228a9583950842629d1a4caef404c8941a0c7799b1a3bd1eb890a09fdb7efcff9

Download Submit
memory/988-11-0x00007FFBF1050000-0x00007FFBF1B12000-memory.dmp

Filesize
10.8MB

Download
memory/988-13-0x00007FFBF1050000-0x00007FFBF1B12000-memory.dmp

Filesize
10.8MB

Download
memory/2444-17-0x00007FFBF1050000-0x00007FFBF1B12000-memory.dmp

Filesize
10.8MB

Download
memory/2444-18-0x00007FFBF1050000-0x00007FFBF1B12000-memory.dmp

Filesize
10.8MB

Download
memory/4996-0-0x0000000000BE0000-0x0000000000BFC000-memory.dmp

Filesize
112KB

Download
memory/4996-1-0x00007FFBF1050000-0x00007FFBF1B12000-memory.dmp

Filesize
10.8MB

Download
memory/4996-2-0x000000001B9B0000-0x000000001B9C0000-memory.dmp

Filesize
64KB

Download
memory/4996-7-0x00007FFBF1050000-0x00007FFBF1B12000-memory.dmp

Filesize
10.8MB

Download
memory/4996-8-0x000000001B9B0000-0x000000001B9C0000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads