xworm | 8117e22fbace37f3ed1dfdcc6567e655619970990acd0df94bd83996a7bdc957

Analysis

max time kernel
118s
max time network
159s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
27/04/2024, 09:13

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General

Target

Krampus/B1OdUv8CBH.exe
Size

1.0MB
MD5

73a20ee98214059033a93ff5da62d903
SHA1

a35422a4969f7d79fc9cf597cf40b7456d5b05d8
SHA256

5df7cf7c7d153a0e55b0ca9299d00c26625e70cff3613540c5718fe74e4c7d12
SHA512

7c3b08ebbc57467aa3615b14d7ea6f629e03e49c17d6268f62345cc58f4ca9823e45ef101c1e247db354ca944481470f94f9c226bc7774f78da9ad0185a76b47
SSDEEP

1536:ZAiYlXZeFi9eKNVlb8i7ZUNQmD4O+HoddUT:anpo2Xb8C8D4OUoET

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 5 IoCs

resource	yara_rule
behavioral1/memory/2704-0-0x0000000000D20000-0x0000000000D3A000-memory.dmp	family_xworm
behavioral1/memory/2704-2-0x000000001B3A0000-0x000000001B420000-memory.dmp	family_xworm
behavioral1/files/0x000c000000014ec4-10.dat	family_xworm
behavioral1/memory/2768-12-0x00000000002C0000-0x00000000002DA000-memory.dmp	family_xworm
behavioral1/memory/1796-15-0x0000000000990000-0x00000000009AA000-memory.dmp	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	B1OdUv8CBH.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\svchost.lnk	B1OdUv8CBH.exe

Executes dropped EXE 2 IoCs

pid	Process
2768	svchost.exe
1796	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-1-5-21-330940541-141609230-1670313778-1000\Software\Microsoft\Windows\CurrentVersion\Run\svchost = "C:\\ProgramData\\svchost.exe"	B1OdUv8CBH.exe

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

Web Service

T1102

flow	ioc
6	pastebin.com
7	pastebin.com

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
4	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
2876	schtasks.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
2704	B1OdUv8CBH.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2704	B1OdUv8CBH.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	2704	B1OdUv8CBH.exe
Token: SeDebugPrivilege	2704	B1OdUv8CBH.exe
Token: SeDebugPrivilege	2768	svchost.exe
Token: SeDebugPrivilege	1796	svchost.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2704	B1OdUv8CBH.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2704 wrote to memory of 2876	2704	B1OdUv8CBH.exe	29
PID 2704 wrote to memory of 2876	2704	B1OdUv8CBH.exe	29
PID 2704 wrote to memory of 2876	2704	B1OdUv8CBH.exe	29
PID 2424 wrote to memory of 2768	2424	taskeng.exe	34
PID 2424 wrote to memory of 2768	2424	taskeng.exe	34
PID 2424 wrote to memory of 2768	2424	taskeng.exe	34
PID 2424 wrote to memory of 1796	2424	taskeng.exe	37
PID 2424 wrote to memory of 1796	2424	taskeng.exe	37
PID 2424 wrote to memory of 1796	2424	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\Krampus\B1OdUv8CBH.exe
"C:\Users\Admin\AppData\Local\Temp\Krampus\B1OdUv8CBH.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:2704
- 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:2876

C:\Windows\system32\taskeng.exe
taskeng.exe {30C767CD-2513-446E-8419-F2B162E4C918} S-1-5-21-330940541-141609230-1670313778-1000:KXIPPCKF\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2424
- C:\ProgramData\svchost.exe
  C:\ProgramData\svchost.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2768
- C:\ProgramData\svchost.exe
  C:\ProgramData\svchost.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1796

C:\Windows\explorer.exe
"C:\Windows\explorer.exe"
1⤵
PID:1472

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Defense Evasion

Modify Registry

T1112

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:\ProgramData\svchost.exe

Filesize
1.0MB

MD5
73a20ee98214059033a93ff5da62d903

SHA1
a35422a4969f7d79fc9cf597cf40b7456d5b05d8

SHA256
5df7cf7c7d153a0e55b0ca9299d00c26625e70cff3613540c5718fe74e4c7d12

SHA512
7c3b08ebbc57467aa3615b14d7ea6f629e03e49c17d6268f62345cc58f4ca9823e45ef101c1e247db354ca944481470f94f9c226bc7774f78da9ad0185a76b47

Download Submit
memory/1796-15-0x0000000000990000-0x00000000009AA000-memory.dmp

Filesize
104KB

Download
memory/2704-0-0x0000000000D20000-0x0000000000D3A000-memory.dmp

Filesize
104KB

Download
memory/2704-1-0x000007FEF53F0000-0x000007FEF5DDC000-memory.dmp

Filesize
9.9MB

Download
memory/2704-2-0x000000001B3A0000-0x000000001B420000-memory.dmp

Filesize
512KB

Download
memory/2704-7-0x000007FEF53F0000-0x000007FEF5DDC000-memory.dmp

Filesize
9.9MB

Download
memory/2704-8-0x000000001B3A0000-0x000000001B420000-memory.dmp

Filesize
512KB

Download
memory/2768-12-0x00000000002C0000-0x00000000002DA000-memory.dmp

Filesize
104KB

Download