xworm | a5a5c28c12ee6698c3965e33182bc04b9a1786cdb0575ae951706b77ac205a5a

General

Target

XClient.exe
Size

74KB
MD5

19982b09ca5db29a23d8548f68dbfc9d
SHA1

da7df1a2ef9f965864b9537c156e7a830038a0a7
SHA256

a5a5c28c12ee6698c3965e33182bc04b9a1786cdb0575ae951706b77ac205a5a
SHA512

df21ba0bcd2af139fde055aec3bebc22b93fb13701aa85b8252d8090c20325fbe56011112fb43cf410bf9973a8a8b6a7bb10c50a30bb7678838df03064bf04ab
SSDEEP

1536:9JPmE4wdmhLx8UADbXjH0cRtl6sKO1c7hO5r:z+ENgZxxADbzBnKO1c7ar

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

sources-alerts.gl.at.ply.gg:1999

Attributes

Install_directory
%AppData%
install_file
FileExplorer.exe

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/memory/4988-1-0x0000000000400000-0x0000000000418000-memory.dmp	family_xworm
behavioral2/files/0x000b000000023c66-59.dat	family_xworm

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

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
1120	powershell.exe
1516	powershell.exe
1748	powershell.exe
1364	powershell.exe

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-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	XClient.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 1 IoCs

pid	Process
1836	FileExplorer.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-1-5-21-2878641211-696417878-3864914810-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\FileExplorer = "C:\\Users\\Admin\\AppData\\Roaming\\FileExplorer.exe"	XClient.exe

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
17	ip-api.com

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
1388	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
1120	powershell.exe
1120	powershell.exe
1516	powershell.exe
1516	powershell.exe
1748	powershell.exe
1748	powershell.exe
1364	powershell.exe
1364	powershell.exe
4988	XClient.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	4988	XClient.exe
Token: SeDebugPrivilege	1120	powershell.exe
Token: SeDebugPrivilege	1516	powershell.exe
Token: SeDebugPrivilege	1748	powershell.exe
Token: SeDebugPrivilege	1364	powershell.exe
Token: SeDebugPrivilege	4988	XClient.exe
Token: SeDebugPrivilege	1836	FileExplorer.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4988	XClient.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4988 wrote to memory of 1120	4988	XClient.exe	90
PID 4988 wrote to memory of 1120	4988	XClient.exe	90
PID 4988 wrote to memory of 1516	4988	XClient.exe	93
PID 4988 wrote to memory of 1516	4988	XClient.exe	93
PID 4988 wrote to memory of 1748	4988	XClient.exe	95
PID 4988 wrote to memory of 1748	4988	XClient.exe	95
PID 4988 wrote to memory of 1364	4988	XClient.exe	97
PID 4988 wrote to memory of 1364	4988	XClient.exe	97
PID 4988 wrote to memory of 1388	4988	XClient.exe	101
PID 4988 wrote to memory of 1388	4988	XClient.exe	101

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⤵
- Checks computer location settings
- Drops startup file
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4988
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1120
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1516
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Roaming\FileExplorer.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1748
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'FileExplorer.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1364
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "FileExplorer" /tr "C:\Users\Admin\AppData\Roaming\FileExplorer.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1388

C:\Users\Admin\AppData\Roaming\FileExplorer.exe
C:\Users\Admin\AppData\Roaming\FileExplorer.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1836

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

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

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

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

Filesize
2KB

MD5
a43e653ffb5ab07940f4bdd9cc8fade4

SHA1
af43d04e3427f111b22dc891c5c7ee8a10ac4123

SHA256
c4c53abb13e99475aebfbe9fec7a8fead81c14c80d9dcc2b81375304f3a683fe

SHA512
62a97e95e1f19a8d4302847110dae44f469877eed6aa8ea22345c6eb25ee220e7d310fa0b7ec5df42356815421c0af7c46a0f1fee8933cc446641800eda6cd1b

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
05626d543357a7b9aab66738323d7ac6

SHA1
8a0366530637b0f977af59dde44fae4df8906f0f

SHA256
352265151df8fcc298bbbde14c4ddff51683a9a43416ce1987511ee7a27fa433

SHA512
11222b457bce9d25eca8b7f4768c5706ad117960d122bf049f94158725187fbaea86f38b3910402043f5a565dcc5faca535366880c0bd92f58a799931a32401d

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
fa8d1461e4feb2c39654e3a555a027f8

SHA1
0ca46b8961ceba8f9da31de5ed2408643fc89141

SHA256
7e26e4f0ef3a7d2904818a691429789c4781029ff4aab697c3b7c9a4287d661f

SHA512
e486b8f029c7eec60b6b2b5603390330afb1ddf627cc01c511808c47e68676b4c429b9f75fd4e16e48b496dccfe8cc8ec4a35825e1e889e66571acb6c03e0869

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
f41f42c322498af0591f396c59dd4304

SHA1
e1e5aa68d73d48bc5e743a34f6c0fa8960ff7514

SHA256
d8bd9a4a363ff2ac2dc887759ec6ba4215a4ce0925a8fb9c531573458ee4a31c

SHA512
2328a1b402b4fb0de9c451fb630eab58549129d3bcfb70b9834cfbd16065ebaadec006b309ea17ac182d34c53e01705cbc9e0196eb0cbd62600c866e79a1844f

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_mi40hczx.wk3.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Roaming\FileExplorer.exe

Filesize
74KB

MD5
19982b09ca5db29a23d8548f68dbfc9d

SHA1
da7df1a2ef9f965864b9537c156e7a830038a0a7

SHA256
a5a5c28c12ee6698c3965e33182bc04b9a1786cdb0575ae951706b77ac205a5a

SHA512
df21ba0bcd2af139fde055aec3bebc22b93fb13701aa85b8252d8090c20325fbe56011112fb43cf410bf9973a8a8b6a7bb10c50a30bb7678838df03064bf04ab

Download Submit
memory/1120-13-0x00000251C6B40000-0x00000251C6B62000-memory.dmp

Filesize
136KB

Download
memory/1120-14-0x00007FFA48870000-0x00007FFA49331000-memory.dmp

Filesize
10.8MB

Download
memory/1120-15-0x00007FFA48870000-0x00007FFA49331000-memory.dmp

Filesize
10.8MB

Download
memory/1120-18-0x00007FFA48870000-0x00007FFA49331000-memory.dmp

Filesize
10.8MB

Download
memory/1120-12-0x00007FFA48870000-0x00007FFA49331000-memory.dmp

Filesize
10.8MB

Download
memory/4988-0-0x00007FFA48873000-0x00007FFA48875000-memory.dmp

Filesize
8KB

Download
memory/4988-2-0x00007FFA48870000-0x00007FFA49331000-memory.dmp

Filesize
10.8MB

Download
memory/4988-1-0x0000000000400000-0x0000000000418000-memory.dmp

Filesize
96KB

Download
memory/4988-57-0x00007FFA48873000-0x00007FFA48875000-memory.dmp

Filesize
8KB

Download
memory/4988-58-0x00007FFA48870000-0x00007FFA49331000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads