xworm | f4140df465adf4050ecea61cb9659b757c97f65b8c3cca7afac5a5e89d203c36

Analysis

max time kernel
139s
max time network
142s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
31/05/2024, 01:16

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General

Target
20235ee05aef546e34ddf783007e6779.exe
Size 70KB
Sample240531-bm536aaf57
SHA256 f4140df465adf4050ecea61cb9659b757c97f65b8c3cca7afac5a5e89d203c36
MD5 20235ee05aef546e34ddf783007e6779
SHA1 999bda8ca538ef81fd3762cdfdf941253c4890d7
SHA512 aa8d92869a44d638f17737d7a477aa6cfcef2dd43cf460b548110417eb6d62258d5285abf3a66fbfe0a44af8414db1cb3335bc04cd0b79d67b86061284fb7f6f
SSDEEP 1536:VmHeyoqqmb8/7kGkbaXtmkcL8U69q4WOZ0B86a:VmHbQTkbaX9FqxOZ0B86a
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Attributes

Install_directory
%AppData%
install_file
Runtime Broker.exe
pastebin_url
https://pastebin.com/raw/kYPYyCCf

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/memory/4140-1-0x00000000000D0000-0x00000000000E8000-memory.dmp	family_xworm
behavioral2/files/0x0009000000022abf-57.dat	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat 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
1852	powershell.exe
5108	powershell.exe
2432	powershell.exe
4152	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-1-5-21-4124900551-4068476067-3491212533-1000\Control Panel\International\Geo\Nation	20235ee05aef546e34ddf783007e6779.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Runtime Broker.lnk	20235ee05aef546e34ddf783007e6779.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Runtime Broker.lnk	20235ee05aef546e34ddf783007e6779.exe

Executes dropped EXE 3 IoCs

pid	Process
2660	Runtime Broker.exe
3816	Runtime Broker.exe
2884	Runtime Broker.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-1-5-21-4124900551-4068476067-3491212533-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Runtime Broker = "C:\\Users\\Admin\\AppData\\Roaming\\Runtime Broker.exe"	20235ee05aef546e34ddf783007e6779.exe

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

Web Service

T1102

flow	ioc
29	pastebin.com
30	pastebin.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
4856	schtasks.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
1852	powershell.exe
1852	powershell.exe
5108	powershell.exe
5108	powershell.exe
2432	powershell.exe
2432	powershell.exe
4152	powershell.exe
4152	powershell.exe

Suspicious use of AdjustPrivilegeToken 9 IoCs

description	pid	Process
Token: SeDebugPrivilege	4140	20235ee05aef546e34ddf783007e6779.exe
Token: SeDebugPrivilege	1852	powershell.exe
Token: SeDebugPrivilege	5108	powershell.exe
Token: SeDebugPrivilege	2432	powershell.exe
Token: SeDebugPrivilege	4152	powershell.exe
Token: SeDebugPrivilege	4140	20235ee05aef546e34ddf783007e6779.exe
Token: SeDebugPrivilege	2660	Runtime Broker.exe
Token: SeDebugPrivilege	3816	Runtime Broker.exe
Token: SeDebugPrivilege	2884	Runtime Broker.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4140 wrote to memory of 1852	4140	20235ee05aef546e34ddf783007e6779.exe	93
PID 4140 wrote to memory of 1852	4140	20235ee05aef546e34ddf783007e6779.exe	93
PID 4140 wrote to memory of 5108	4140	20235ee05aef546e34ddf783007e6779.exe	97
PID 4140 wrote to memory of 5108	4140	20235ee05aef546e34ddf783007e6779.exe	97
PID 4140 wrote to memory of 2432	4140	20235ee05aef546e34ddf783007e6779.exe	101
PID 4140 wrote to memory of 2432	4140	20235ee05aef546e34ddf783007e6779.exe	101
PID 4140 wrote to memory of 4152	4140	20235ee05aef546e34ddf783007e6779.exe	103
PID 4140 wrote to memory of 4152	4140	20235ee05aef546e34ddf783007e6779.exe	103
PID 4140 wrote to memory of 4856	4140	20235ee05aef546e34ddf783007e6779.exe	105
PID 4140 wrote to memory of 4856	4140	20235ee05aef546e34ddf783007e6779.exe	105

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\20235ee05aef546e34ddf783007e6779.exe
"C:\Users\Admin\AppData\Local\Temp\20235ee05aef546e34ddf783007e6779.exe"
1⤵
- Checks computer location settings
- Drops startup file
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4140
- 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\20235ee05aef546e34ddf783007e6779.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1852
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess '20235ee05aef546e34ddf783007e6779.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:5108
- 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\Runtime Broker.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2432
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Runtime Broker.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4152
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "Runtime Broker" /tr "C:\Users\Admin\AppData\Roaming\Runtime Broker.exe"
  2⤵
  - Creates scheduled task(s)
  PID:4856

C:\Users\Admin\AppData\Roaming\Runtime Broker.exe
"C:\Users\Admin\AppData\Roaming\Runtime Broker.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2660

C:\Users\Admin\AppData\Roaming\Runtime Broker.exe
"C:\Users\Admin\AppData\Roaming\Runtime Broker.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3816

C:\Users\Admin\AppData\Roaming\Runtime Broker.exe
"C:\Users\Admin\AppData\Roaming\Runtime Broker.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2884

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

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

Runtime Broker.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Runtime Broker.exe.log
Size 654B
SHA256 e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced
MD5 2ff39f6c7249774be85fd60a8f9a245e
SHA1 684ff36b31aedc1e587c8496c02722c6698c1c4e
SHA512 1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1
MD5 SHA1 SHA512

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powershell.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log
Size 2KB
SHA256 84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f
MD5 d85ba6ff808d9e5444a4b369f5bc2730
SHA1 31aa9d96590fff6981b315e0b391b575e4c0804a
SHA512 8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 944B
SHA256 385da35673330e21ac02545220552fe301fe54dedefbdafc097ac4342a295233
MD5 2e907f77659a6601fcc408274894da2e
SHA1 9f5b72abef1cd7145bf37547cdb1b9254b4efe9d
SHA512 34fa0fff24f6550f55f828541aaefe5d75c86f8f0842d54b50065e9746f9662bb7209c74c9a9571540b9855bb3851f01db613190024e89b198d485bb5dc07721
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 944B
SHA256 5ef1421e19fde4bc03cd825dd7d6c0e7863f85fd8f0aa4a4d4f8d555dc7606d1
MD5 ba169f4dcbbf147fe78ef0061a95e83b
SHA1 92a571a6eef49fff666e0f62a3545bcd1cdcda67
SHA512 8d2e5e552210dcda684682538bc964fdd8a8ff5b24cc2cc8af813729f0202191f98eb42d38d2355df17ae620fe401aad6ceaedaed3b112fdacd32485a3a0c07c
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 944B
SHA256 0f9a4b52e01cb051052228a55d0515911b7ef5a8db3cf925528c746df511424d
MD5 34f595487e6bfd1d11c7de88ee50356a
SHA1 4caad088c15766cc0fa1f42009260e9a02f953bb
SHA512 10976c5deaf9fac449e703e852c3b08d099f430de2d7c7b8e2525c35d63e28b890e5aab63feff9b20bca0aaf9f35a3ba411aee3fbeee9ea59f90ed25bd617a0b
MD5 SHA1 SHA512

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__PSScriptPolicyTest_ilxwmyol.vka.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ilxwmyol.vka.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
MD5 SHA1 SHA512

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Runtime Broker.exe

Path C:\Users\Admin\AppData\Roaming\Runtime Broker.exe
Size 70KB
SHA256 f4140df465adf4050ecea61cb9659b757c97f65b8c3cca7afac5a5e89d203c36
MD5 20235ee05aef546e34ddf783007e6779
SHA1 999bda8ca538ef81fd3762cdfdf941253c4890d7
SHA512 aa8d92869a44d638f17737d7a477aa6cfcef2dd43cf460b548110417eb6d62258d5285abf3a66fbfe0a44af8414db1cb3335bc04cd0b79d67b86061284fb7f6f
SSDEEP 1536:VmHeyoqqmb8/7kGkbaXtmkcL8U69q4WOZ0B86a:VmHbQTkbaX9FqxOZ0B86a
MD5 SHA1 SHA512 SSDEEP

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memory/1852-12-0x00007FFA03790000-0x00007FFA04251000-memory.dmp

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memory/1852-17-0x00007FFA03790000-0x00007FFA04251000-memory.dmp

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memory/1852-14-0x00007FFA03790000-0x00007FFA04251000-memory.dmp

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memory/1852-13-0x00007FFA03790000-0x00007FFA04251000-memory.dmp

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memory/1852-2-0x000001D4DCF00000-0x000001D4DCF22000-memory.dmp

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memory/4140-0-0x00007FFA03793000-0x00007FFA03795000-memory.dmp

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memory/4140-56-0x00007FFA03790000-0x00007FFA04251000-memory.dmp

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memory/4140-59-0x00007FFA03793000-0x00007FFA03795000-memory.dmp

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memory/4140-61-0x00007FFA03790000-0x00007FFA04251000-memory.dmp

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memory/4140-1-0x00000000000D0000-0x00000000000E8000-memory.dmp

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