xworm | 8efa6f0711c60afd3e6cb29df2b740ee4d01b7f4290a223aa85c6f54fb3b9da5

General

Target

winlogon.exe
Size

59KB
MD5

f2a18b995a82e938ab6a067491aa0d79
SHA1

d437fca2f38d712bafae8c92169eec8934699e54
SHA256

8efa6f0711c60afd3e6cb29df2b740ee4d01b7f4290a223aa85c6f54fb3b9da5
SHA512

73db4ec0271045f3f2c40fa197cf6300d81f32e4ecdddf792b475c8234d997c8d9ddfd62f944f230d8929017dfd1f473fbf4470f3bf6c2e92a8606cd3fed6d56
SSDEEP

1536:CcG/DG/fDG+wopontVm+4ys9bFKR4F+9E6ywbgOmXvkAq:CcGGfDG+wWoPm+4X9bFKac/0Omfbq

Score

10^/10

xworm execution rat trojan

Malware Config

Extracted

Family

xworm

Attributes

Install_directory
%ProgramData%
install_file
winlogon.exe
pastebin_url
https://pastebin.com/raw/QUwdrCNg

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral1/memory/3232-1-0x0000000000E30000-0x0000000000E44000-memory.dmp	family_xworm
behavioral1/files/0x000e000000023bfa-57.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
432	powershell.exe
2000	powershell.exe
1572	powershell.exe
3124	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-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	winlogon.exe

Executes dropped EXE 17 IoCs

pid	Process
4580	winlogon.exe
1664	winlogon.exe
2208	winlogon.exe
3544	winlogon.exe
2540	winlogon.exe
3708	winlogon.exe
3364	winlogon.exe
4372	winlogon.exe
1352	winlogon.exe
508	winlogon.exe
4516	winlogon.exe
1332	winlogon.exe
3196	winlogon.exe
1964	winlogon.exe
316	winlogon.exe
1616	winlogon.exe
1676	winlogon.exe

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

Web Service

T1102

flow	ioc
22	pastebin.com
23	pastebin.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
2460	schtasks.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
3232	winlogon.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
432	powershell.exe
432	powershell.exe
2000	powershell.exe
2000	powershell.exe
1572	powershell.exe
1572	powershell.exe
3124	powershell.exe
3124	powershell.exe
3232	winlogon.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
3232	winlogon.exe

Suspicious use of AdjustPrivilegeToken 23 IoCs

description	pid	Process
Token: SeDebugPrivilege	3232	winlogon.exe
Token: SeDebugPrivilege	432	powershell.exe
Token: SeDebugPrivilege	2000	powershell.exe
Token: SeDebugPrivilege	1572	powershell.exe
Token: SeDebugPrivilege	3124	powershell.exe
Token: SeDebugPrivilege	3232	winlogon.exe
Token: SeDebugPrivilege	4580	winlogon.exe
Token: SeDebugPrivilege	1664	winlogon.exe
Token: SeDebugPrivilege	2208	winlogon.exe
Token: SeDebugPrivilege	3544	winlogon.exe
Token: SeDebugPrivilege	2540	winlogon.exe
Token: SeDebugPrivilege	3708	winlogon.exe
Token: SeDebugPrivilege	3364	winlogon.exe
Token: SeDebugPrivilege	4372	winlogon.exe
Token: SeDebugPrivilege	1352	winlogon.exe
Token: SeDebugPrivilege	508	winlogon.exe
Token: SeDebugPrivilege	4516	winlogon.exe
Token: SeDebugPrivilege	1332	winlogon.exe
Token: SeDebugPrivilege	3196	winlogon.exe
Token: SeDebugPrivilege	1964	winlogon.exe
Token: SeDebugPrivilege	316	winlogon.exe
Token: SeDebugPrivilege	1616	winlogon.exe
Token: SeDebugPrivilege	1676	winlogon.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3232	winlogon.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 3232 wrote to memory of 432	3232	winlogon.exe	88
PID 3232 wrote to memory of 432	3232	winlogon.exe	88
PID 3232 wrote to memory of 2000	3232	winlogon.exe	90
PID 3232 wrote to memory of 2000	3232	winlogon.exe	90
PID 3232 wrote to memory of 1572	3232	winlogon.exe	94
PID 3232 wrote to memory of 1572	3232	winlogon.exe	94
PID 3232 wrote to memory of 3124	3232	winlogon.exe	96
PID 3232 wrote to memory of 3124	3232	winlogon.exe	96
PID 3232 wrote to memory of 2460	3232	winlogon.exe	100
PID 3232 wrote to memory of 2460	3232	winlogon.exe	100
PID 3232 wrote to memory of 4076	3232	winlogon.exe	120
PID 3232 wrote to memory of 4076	3232	winlogon.exe	120

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\winlogon.exe
"C:\Users\Admin\AppData\Local\Temp\winlogon.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3232
- 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\winlogon.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:432
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'winlogon.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2000
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\ProgramData\winlogon.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1572
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'winlogon.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3124
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "winlogon" /tr "C:\ProgramData\winlogon.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2460
- C:\Windows\SYSTEM32\CMD.EXE
  "CMD.EXE"
  2⤵
  PID:4076

C:\ProgramData\winlogon.exe
C:\ProgramData\winlogon.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4580

C:\ProgramData\winlogon.exe
C:\ProgramData\winlogon.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1664

C:\ProgramData\winlogon.exe
C:\ProgramData\winlogon.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2208

C:\ProgramData\winlogon.exe
C:\ProgramData\winlogon.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3544

C:\ProgramData\winlogon.exe
C:\ProgramData\winlogon.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2540

C:\ProgramData\winlogon.exe
C:\ProgramData\winlogon.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3708

C:\ProgramData\winlogon.exe
C:\ProgramData\winlogon.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3364

C:\ProgramData\winlogon.exe
C:\ProgramData\winlogon.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4372

C:\ProgramData\winlogon.exe
C:\ProgramData\winlogon.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1352

C:\ProgramData\winlogon.exe
C:\ProgramData\winlogon.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:508

C:\ProgramData\winlogon.exe
C:\ProgramData\winlogon.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4516

C:\ProgramData\winlogon.exe
C:\ProgramData\winlogon.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1332

C:\ProgramData\winlogon.exe
C:\ProgramData\winlogon.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3196

C:\ProgramData\winlogon.exe
C:\ProgramData\winlogon.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1964

C:\ProgramData\winlogon.exe
C:\ProgramData\winlogon.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:316

C:\ProgramData\winlogon.exe
C:\ProgramData\winlogon.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1616

C:\ProgramData\winlogon.exe
C:\ProgramData\winlogon.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1676

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

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\ProgramData\winlogon.exe

Filesize
59KB

MD5
f2a18b995a82e938ab6a067491aa0d79

SHA1
d437fca2f38d712bafae8c92169eec8934699e54

SHA256
8efa6f0711c60afd3e6cb29df2b740ee4d01b7f4290a223aa85c6f54fb3b9da5

SHA512
73db4ec0271045f3f2c40fa197cf6300d81f32e4ecdddf792b475c8234d997c8d9ddfd62f944f230d8929017dfd1f473fbf4470f3bf6c2e92a8606cd3fed6d56

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

Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

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

Filesize
654B

MD5
2ff39f6c7249774be85fd60a8f9a245e

SHA1
684ff36b31aedc1e587c8496c02722c6698c1c4e

SHA256
e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced

SHA512
1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1

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

Filesize
944B

MD5
6d3e9c29fe44e90aae6ed30ccf799ca8

SHA1
c7974ef72264bbdf13a2793ccf1aed11bc565dce

SHA256
2360634e63e8f0b5748e2c56ebb8f4aa78e71008ea7b5c9ca1c49be03b49557d

SHA512
60c38c4367352537545d859f64b9c5cbada94240478d1d039fd27b5ecba4dc1c90051557c16d802269703b873546ead416279c0a80c6fd5e49ad361cef22596a

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

Filesize
944B

MD5
d8cb3e9459807e35f02130fad3f9860d

SHA1
5af7f32cb8a30e850892b15e9164030a041f4bd6

SHA256
2b139c74072ccbdaa17b950f32a6dbc934dfb7af9973d97c9b0d9c498012ba68

SHA512
045239ba31367fbdd59e883f74eafc05724e23bd6e8f0c1e7171ea2496a497eb9e0cfcb57285bb81c4d569daadba43d6ef64c626ca48f1e2a59e8d97f0cc9184

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

Filesize
944B

MD5
0a5050f7790dd5e1412a6beb6e7144e8

SHA1
56e9d0435ef468f434018bd33de2cfe9f76ec98b

SHA256
67d73fd7f5596cf8f19167e3aefca1cdc5b784da4142610f5eb614754ca0ae19

SHA512
a73c014e3655f31c8a36c06a6a4e2ba77a02028ff865611ed5dadcd826e6a17de5c76d7b087c614fbf37c701e13dcb84365b67f3b1599e3a25a460efb6d3c99a

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_br3v0rzc.axb.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/432-2-0x0000021BBE430000-0x0000021BBE452000-memory.dmp

Filesize
136KB

Download
memory/432-17-0x00007FFDBE8A0000-0x00007FFDBF361000-memory.dmp

Filesize
10.8MB

Download
memory/432-13-0x00007FFDBE8A0000-0x00007FFDBF361000-memory.dmp

Filesize
10.8MB

Download
memory/432-12-0x00007FFDBE8A0000-0x00007FFDBF361000-memory.dmp

Filesize
10.8MB

Download
memory/432-14-0x00007FFDBE8A0000-0x00007FFDBF361000-memory.dmp

Filesize
10.8MB

Download
memory/1572-41-0x00000290AF670000-0x00000290AF88C000-memory.dmp

Filesize
2.1MB

Download
memory/3232-0-0x00007FFDBE8A3000-0x00007FFDBE8A5000-memory.dmp

Filesize
8KB

Download
memory/3232-55-0x00007FFDBE8A3000-0x00007FFDBE8A5000-memory.dmp

Filesize
8KB

Download
memory/3232-56-0x00007FFDBE8A0000-0x00007FFDBF361000-memory.dmp

Filesize
10.8MB

Download
memory/3232-54-0x00007FFDBE8A0000-0x00007FFDBF361000-memory.dmp

Filesize
10.8MB

Download
memory/3232-1-0x0000000000E30000-0x0000000000E44000-memory.dmp

Filesize
80KB

Download
memory/3232-62-0x000000001D440000-0x000000001D44A000-memory.dmp

Filesize
40KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads