xworm | 42a2d2e5a819e1b67c4ea11e3bee7aafa22770cb129cdcbefb0ff69afd233bfa | Triage™

Analysis

max time kernel
146s
max time network
148s
platform
windows7_x64
resource
win7-20240508-en
resource tags

arch:x64arch:x86image:win7-20240508-enlocale:en-usos:windows7-x64system
submitted
04/06/2024, 15:51

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General

Target
XClient.exe
Size 60KB
Sample240604-tawcascf52
SHA256 42a2d2e5a819e1b67c4ea11e3bee7aafa22770cb129cdcbefb0ff69afd233bfa
MD5 e8ee78cf58645a01fe7ae5bc9f5ae405
SHA1 a4d0847523efd1df1b0d9c077f43718a34a607a0
SHA512 31f147b76b764dc1430d609181c744842459471175c5039556532b4069cf81b3b572c6fc8964a4af7ab2c85cffaa332d9b2b62062f40081d26b284529efc94dd
SSDEEP 1536:sy3fzHAXOrtdf1jLCGmZrzb+KTAYPAUuBx7OHii8Pe:sU0XwfFHmNzb+F9Bx7OH6e
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

xworm persistence rat trojan

Malware Config

Extracted

Family

xworm

Version

3.0

C2

ayumi-27013.portmap.host:27013

Attributes

Install_directory
%AppData%
install_file
USB.exe

Signatures

Detect Xworm Payload 3 IoCs

resource	yara_rule
behavioral2/memory/1520-1-0x0000000000E10000-0x0000000000E26000-memory.dmp	family_xworm
behavioral2/files/0x0011000000012272-8.dat	family_xworm
behavioral2/memory/1636-14-0x0000000000C80000-0x0000000000C96000-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\XClient.lnk	XClient.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\XClient.lnk	XClient.exe

Executes dropped EXE 3 IoCs

pid	Process
1636	XClient.exe
2492	XClient.exe
2848	XClient.exe

Adds Run key to start application 2 TTPs 1 IoCs

Registry Run Keys / Startup Folder

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3691908287-3775019229-3534252667-1000\Software\Microsoft\Windows\CurrentVersion\Run\XClient = "C:\\Users\\Admin\\AppData\\Roaming\\XClient.exe"	XClient.exe

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.

Scheduled Task/Job

pid	Process
2080	schtasks.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	1520	XClient.exe
Token: SeDebugPrivilege	1636	XClient.exe
Token: SeDebugPrivilege	2492	XClient.exe
Token: SeDebugPrivilege	2848	XClient.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 1520 wrote to memory of 2080	1520	XClient.exe	28
PID 1520 wrote to memory of 2080	1520	XClient.exe	28
PID 1520 wrote to memory of 2080	1520	XClient.exe	28
PID 2876 wrote to memory of 1636	2876	taskeng.exe	31
PID 2876 wrote to memory of 1636	2876	taskeng.exe	31
PID 2876 wrote to memory of 1636	2876	taskeng.exe	31
PID 2876 wrote to memory of 2492	2876	taskeng.exe	34
PID 2876 wrote to memory of 2492	2876	taskeng.exe	34
PID 2876 wrote to memory of 2492	2876	taskeng.exe	34
PID 2876 wrote to memory of 2848	2876	taskeng.exe	35
PID 2876 wrote to memory of 2848	2876	taskeng.exe	35
PID 2876 wrote to memory of 2848	2876	taskeng.exe	35

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\XClient.exe
"C:\Users\Admin\AppData\Local\Temp\XClient.exe"
1⤵
- Drops startup file
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1520
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "XClient" /tr "C:\Users\Admin\AppData\Roaming\XClient.exe"
  2⤵
  - Creates scheduled task(s)
  PID:2080

C:\Windows\system32\taskeng.exe
taskeng.exe {7E978D73-58BA-41C4-8EA2-6089BFA72418} S-1-5-21-3691908287-3775019229-3534252667-1000:UOTHCPHQ\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2876
- C:\Users\Admin\AppData\Roaming\XClient.exe
  C:\Users\Admin\AppData\Roaming\XClient.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1636
- C:\Users\Admin\AppData\Roaming\XClient.exe
  C:\Users\Admin\AppData\Roaming\XClient.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2492
- C:\Users\Admin\AppData\Roaming\XClient.exe
  C:\Users\Admin\AppData\Roaming\XClient.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2848

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

Persistence

Boot or Logon Autostart Execution

Registry Run Keys / Startup Folder

Scheduled Task/Job

Privilege Escalation

Boot or Logon Autostart Execution

Registry Run Keys / Startup Folder

Scheduled Task/Job

Defense Evasion

Modify Registry

Credential Access

Discovery

Query Registry

System Information Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

XClient.exe

Path C:\Users\Admin\AppData\Roaming\XClient.exe
Size 60KB
SHA256 42a2d2e5a819e1b67c4ea11e3bee7aafa22770cb129cdcbefb0ff69afd233bfa
MD5 e8ee78cf58645a01fe7ae5bc9f5ae405
SHA1 a4d0847523efd1df1b0d9c077f43718a34a607a0
SHA512 31f147b76b764dc1430d609181c744842459471175c5039556532b4069cf81b3b572c6fc8964a4af7ab2c85cffaa332d9b2b62062f40081d26b284529efc94dd
SSDEEP 1536:sy3fzHAXOrtdf1jLCGmZrzb+KTAYPAUuBx7OHii8Pe:sU0XwfFHmNzb+F9Bx7OH6e
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/1520-0-0x000007FEF5F83000-0x000007FEF5F84000-memory.dmp

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memory/1520-1-0x0000000000E10000-0x0000000000E26000-memory.dmp

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memory/1520-10-0x000007FEF5F80000-0x000007FEF696C000-memory.dmp

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memory/1520-15-0x000007FEF5F83000-0x000007FEF5F84000-memory.dmp

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memory/1520-16-0x000007FEF5F80000-0x000007FEF696C000-memory.dmp

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memory/1636-14-0x0000000000C80000-0x0000000000C96000-memory.dmp

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