Malware Analysis Report

2024-11-16 13:32

Sample ID 240620-xnwf1axapq
Target XClient.exe
SHA256 8df716860dc2a2e82617b537f498dfdcce9dfbf43ce7f3ac6794228a8440fa00
Tags
xworm persistence rat trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

8df716860dc2a2e82617b537f498dfdcce9dfbf43ce7f3ac6794228a8440fa00

Threat Level: Known bad

The file XClient.exe was found to be: Known bad.

Malicious Activity Summary

xworm persistence rat trojan

Detect Xworm Payload

Xworm

Xworm family

Checks computer location settings

Executes dropped EXE

Drops startup file

Adds Run key to start application

Looks up external IP address via web service

Unsigned PE

Enumerates physical storage devices

Uses Task Scheduler COM API

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

Scheduled Task/Job: Scheduled Task

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-06-20 19:00

Signatures

Detect Xworm Payload

Description Indicator Process Target
N/A N/A N/A N/A

Xworm family

xworm

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-20 19:00

Reported

2024-06-20 19:03

Platform

win7-20231129-en

Max time kernel

148s

Max time network

128s

Command Line

"C:\Users\Admin\AppData\Local\Temp\XClient.exe"

Signatures

Detect Xworm Payload

Description Indicator Process Target
N/A N/A N/A N/A

Xworm

trojan rat xworm

Drops startup file

Description Indicator Process Target
File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Windows Defender.lnk C:\Users\Admin\AppData\Local\Temp\XClient.exe N/A
File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Windows Defender.lnk C:\Users\Admin\AppData\Local\Temp\XClient.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-3627615824-4061627003-3019543961-1000\Software\Microsoft\Windows\CurrentVersion\Run\Windows Defender = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Windows Defender.exe" C:\Users\Admin\AppData\Local\Temp\XClient.exe N/A

Looks up external IP address via web service

Description Indicator Process Target
N/A ip-api.com N/A N/A

Enumerates physical storage devices

Scheduled Task/Job: Scheduled Task

persistence execution
Description Indicator Process Target
N/A N/A C:\Windows\System32\schtasks.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\XClient.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2392 wrote to memory of 2564 N/A C:\Users\Admin\AppData\Local\Temp\XClient.exe C:\Windows\System32\schtasks.exe
PID 2392 wrote to memory of 2564 N/A C:\Users\Admin\AppData\Local\Temp\XClient.exe C:\Windows\System32\schtasks.exe
PID 2392 wrote to memory of 2564 N/A C:\Users\Admin\AppData\Local\Temp\XClient.exe C:\Windows\System32\schtasks.exe

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\XClient.exe

"C:\Users\Admin\AppData\Local\Temp\XClient.exe"

C:\Windows\System32\schtasks.exe

"C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "Windows Defender" /tr "C:\Users\Admin\AppData\Local\Temp\Windows Defender.exe"

C:\Windows\system32\taskeng.exe

taskeng.exe {53E2A45F-ED68-4714-8FDA-7290776E84F7} S-1-5-21-3627615824-4061627003-3019543961-1000:SCFGBRBT\Admin:Interactive:[1]

Network

Country Destination Domain Proto
US 8.8.8.8:53 ip-api.com udp
US 208.95.112.1:80 ip-api.com tcp
N/A 192.168.56.1:8888 tcp
N/A 192.168.56.1:8888 tcp
N/A 192.168.56.1:8888 tcp
N/A 127.0.0.1:8888 tcp
N/A 127.0.0.1:8888 tcp
N/A 127.0.0.1:8888 tcp
N/A 192.168.56.1:8888 tcp
N/A 127.0.0.1:8888 tcp

Files

memory/2392-0-0x000007FEF5043000-0x000007FEF5044000-memory.dmp

memory/2392-1-0x0000000000A40000-0x0000000000A54000-memory.dmp

memory/2392-2-0x000007FEF5040000-0x000007FEF5A2C000-memory.dmp

memory/2392-7-0x000007FEF5043000-0x000007FEF5044000-memory.dmp

memory/2392-8-0x000007FEF5040000-0x000007FEF5A2C000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-20 19:00

Reported

2024-06-20 19:03

Platform

win10v2004-20240508-en

Max time kernel

144s

Max time network

146s

Command Line

"C:\Users\Admin\AppData\Local\Temp\XClient.exe"

Signatures

Detect Xworm Payload

Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A

Xworm

trojan rat xworm

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\XClient.exe N/A

Drops startup file

Description Indicator Process Target
File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Windows Defender.lnk C:\Users\Admin\AppData\Local\Temp\XClient.exe N/A
File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Windows Defender.lnk C:\Users\Admin\AppData\Local\Temp\XClient.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Windows Defender = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Windows Defender.exe" C:\Users\Admin\AppData\Local\Temp\XClient.exe N/A

Looks up external IP address via web service

Description Indicator Process Target
N/A ip-api.com N/A N/A

Enumerates physical storage devices

Scheduled Task/Job: Scheduled Task

persistence execution
Description Indicator Process Target
N/A N/A C:\Windows\System32\schtasks.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\XClient.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Windows Defender.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Windows Defender.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Windows Defender.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 4628 wrote to memory of 1276 N/A C:\Users\Admin\AppData\Local\Temp\XClient.exe C:\Windows\System32\schtasks.exe
PID 4628 wrote to memory of 1276 N/A C:\Users\Admin\AppData\Local\Temp\XClient.exe C:\Windows\System32\schtasks.exe

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\XClient.exe

"C:\Users\Admin\AppData\Local\Temp\XClient.exe"

C:\Windows\System32\schtasks.exe

"C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "Windows Defender" /tr "C:\Users\Admin\AppData\Local\Temp\Windows Defender.exe"

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe

"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --field-trial-handle=4180,i,1999448010053300448,1112699187621658374,262144 --variations-seed-version --mojo-platform-channel-handle=4080 /prefetch:8

C:\Users\Admin\AppData\Local\Temp\Windows Defender.exe

"C:\Users\Admin\AppData\Local\Temp\Windows Defender.exe"

C:\Windows\system32\svchost.exe

C:\Windows\system32\svchost.exe -k LocalSystemNetworkRestricted -p -s DisplayEnhancementService

C:\Users\Admin\AppData\Local\Temp\Windows Defender.exe

"C:\Users\Admin\AppData\Local\Temp\Windows Defender.exe"

C:\Users\Admin\AppData\Local\Temp\Windows Defender.exe

"C:\Users\Admin\AppData\Local\Temp\Windows Defender.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 183.142.211.20.in-addr.arpa udp
US 8.8.8.8:53 73.144.22.2.in-addr.arpa udp
US 8.8.8.8:53 ip-api.com udp
US 208.95.112.1:80 ip-api.com tcp
US 8.8.8.8:53 138.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 1.112.95.208.in-addr.arpa udp
N/A 192.168.56.1:8888 tcp
US 8.8.8.8:53 58.55.71.13.in-addr.arpa udp
US 8.8.8.8:53 cxcs.microsoft.net udp
CZ 104.64.113.235:443 cxcs.microsoft.net tcp
NL 23.62.61.194:443 www.bing.com tcp
US 8.8.8.8:53 194.61.62.23.in-addr.arpa udp
US 8.8.8.8:53 235.113.64.104.in-addr.arpa udp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 56.126.166.20.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
N/A 127.0.0.1:8888 tcp
N/A 127.0.0.1:8888 tcp
US 8.8.8.8:53 22.236.111.52.in-addr.arpa udp
N/A 127.0.0.1:8888 tcp
N/A 127.0.0.1:8888 tcp
N/A 192.168.56.1:8888 tcp
N/A 127.0.0.1:8888 tcp
N/A 127.0.0.1:8888 tcp
US 8.8.8.8:53 201.64.52.20.in-addr.arpa udp
N/A 127.0.0.1:8888 tcp
N/A 192.168.56.1:8888 tcp

Files

memory/4628-0-0x00007FFFE6243000-0x00007FFFE6245000-memory.dmp

memory/4628-1-0x0000000000860000-0x0000000000874000-memory.dmp

memory/4628-2-0x00007FFFE6240000-0x00007FFFE6D01000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\Windows Defender.exe

MD5 76b95ef6259dbde70d6b8b031d19aaf4
SHA1 99a7c78521b12d54442f512f10d2a819c261a7bc
SHA256 8df716860dc2a2e82617b537f498dfdcce9dfbf43ce7f3ac6794228a8440fa00
SHA512 124a90716a6020fffa734ed87bc0f6ffc92b8c172b8c4e595d95b633ca3b98d2f31729ca4bc2f441848da92428fc84468ab538735e5daec19488170aa0fbb173

memory/4628-9-0x00007FFFE6243000-0x00007FFFE6245000-memory.dmp

memory/4856-10-0x00007FFFE6240000-0x00007FFFE6D01000-memory.dmp

memory/4856-12-0x00007FFFE6240000-0x00007FFFE6D01000-memory.dmp

memory/4628-13-0x00007FFFE6240000-0x00007FFFE6D01000-memory.dmp

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

MD5 2ff39f6c7249774be85fd60a8f9a245e
SHA1 684ff36b31aedc1e587c8496c02722c6698c1c4e
SHA256 e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced
SHA512 1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1