xworm | 23ecee99ee4ab7a150f91d4202033a6629cf5af74d80b6a12c2396f1f775734f

General

Target

RuntimeBroker.exe
Size

73KB
MD5

7a5408d9535b2e5db8d194f4d8b93c23
SHA1

c8c6caf9f750b4bc756b40c41f00c3ed3af7fbeb
SHA256

23ecee99ee4ab7a150f91d4202033a6629cf5af74d80b6a12c2396f1f775734f
SHA512

95ef1bdb1e56b3d9c6809586ea0d8ff197375584f8625748811dceb4783fb693749b49c3ed0890c23782946acec3ba5baadcf49735a87985e30f14081a365fd8
SSDEEP

1536:Jb2yCofWhUvuJJH9o2qMnfAQPJwz7opMfQxnbSUyJhb/KpKU+k6eeOJ5w0pIBAM:nWhUvuJB9o2qMnfAQPJKy1jyJhb/KHhO

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Attributes

Install_directory
%ProgramData%
install_file
USB.exe
pastebin_url
https://pastebin.com/raw/DSFaHH8B

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/memory/1236-1-0x0000000000E50000-0x0000000000E68000-memory.dmp	family_xworm
behavioral2/files/0x000e000000023c62-54.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
2988	powershell.exe
2372	powershell.exe
4516	powershell.exe
4368	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-1-5-21-3181990009-820930284-137514597-1000\Control Panel\International\Geo\Nation	RuntimeBroker.exe

Executes dropped EXE 3 IoCs

pid	Process
3460	Runtime Broker
2416	Runtime Broker
2436	Runtime Broker

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-1-5-21-3181990009-820930284-137514597-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Runtime Broker = "C:\\ProgramData\\Runtime Broker"	RuntimeBroker.exe

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

Web Service

T1102

flow	ioc
32	pastebin.com
33	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
2196	schtasks.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
1236	RuntimeBroker.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
2372	powershell.exe
2372	powershell.exe
4516	powershell.exe
4516	powershell.exe
4368	powershell.exe
4368	powershell.exe
2988	powershell.exe
2988	powershell.exe
1236	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 9 IoCs

description	pid	Process
Token: SeDebugPrivilege	1236	RuntimeBroker.exe
Token: SeDebugPrivilege	2372	powershell.exe
Token: SeDebugPrivilege	4516	powershell.exe
Token: SeDebugPrivilege	4368	powershell.exe
Token: SeDebugPrivilege	2988	powershell.exe
Token: SeDebugPrivilege	1236	RuntimeBroker.exe
Token: SeDebugPrivilege	3460	Runtime Broker
Token: SeDebugPrivilege	2416	Runtime Broker
Token: SeDebugPrivilege	2436	Runtime Broker

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1236	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1236 wrote to memory of 2372	1236	RuntimeBroker.exe	92
PID 1236 wrote to memory of 2372	1236	RuntimeBroker.exe	92
PID 1236 wrote to memory of 4516	1236	RuntimeBroker.exe	95
PID 1236 wrote to memory of 4516	1236	RuntimeBroker.exe	95
PID 1236 wrote to memory of 4368	1236	RuntimeBroker.exe	98
PID 1236 wrote to memory of 4368	1236	RuntimeBroker.exe	98
PID 1236 wrote to memory of 2988	1236	RuntimeBroker.exe	100
PID 1236 wrote to memory of 2988	1236	RuntimeBroker.exe	100
PID 1236 wrote to memory of 2196	1236	RuntimeBroker.exe	103
PID 1236 wrote to memory of 2196	1236	RuntimeBroker.exe	103

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\RuntimeBroker.exe
"C:\Users\Admin\AppData\Local\Temp\RuntimeBroker.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1236
- 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\RuntimeBroker.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2372
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'RuntimeBroker.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4516
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\ProgramData\Runtime Broker'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4368
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Runtime Broker'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2988
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "Runtime Broker" /tr "C:\ProgramData\Runtime Broker"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2196

C:\ProgramData\Runtime Broker
"C:\ProgramData\Runtime Broker"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3460

C:\ProgramData\Runtime Broker
"C:\ProgramData\Runtime Broker"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2416

C:\ProgramData\Runtime Broker
"C:\ProgramData\Runtime Broker"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2436

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

Web Service

1

T1102

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\ProgramData\Runtime Broker

Filesize
73KB

MD5
7a5408d9535b2e5db8d194f4d8b93c23

SHA1
c8c6caf9f750b4bc756b40c41f00c3ed3af7fbeb

SHA256
23ecee99ee4ab7a150f91d4202033a6629cf5af74d80b6a12c2396f1f775734f

SHA512
95ef1bdb1e56b3d9c6809586ea0d8ff197375584f8625748811dceb4783fb693749b49c3ed0890c23782946acec3ba5baadcf49735a87985e30f14081a365fd8

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Runtime Broker.log

Filesize
654B

MD5
2ff39f6c7249774be85fd60a8f9a245e

SHA1
684ff36b31aedc1e587c8496c02722c6698c1c4e

SHA256
e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced

SHA512
1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1

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\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
77d622bb1a5b250869a3238b9bc1402b

SHA1
d47f4003c2554b9dfc4c16f22460b331886b191b

SHA256
f97ff12a8abf4bf88bb6497bd2ac2da12628c8847a8ba5a9026bdbb76507cdfb

SHA512
d6789b5499f23c9035375a102271e17a8a82e57d6f5312fa24242e08a83efdeb8becb7622f55c4cf1b89c7d864b445df11f4d994cf7e2f87a900535bcca12fd9

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

Filesize
944B

MD5
34f595487e6bfd1d11c7de88ee50356a

SHA1
4caad088c15766cc0fa1f42009260e9a02f953bb

SHA256
0f9a4b52e01cb051052228a55d0515911b7ef5a8db3cf925528c746df511424d

SHA512
10976c5deaf9fac449e703e852c3b08d099f430de2d7c7b8e2525c35d63e28b890e5aab63feff9b20bca0aaf9f35a3ba411aee3fbeee9ea59f90ed25bd617a0b

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

Filesize
944B

MD5
b7189719e6df2c3dfc76197ec3f31f7a

SHA1
effd91412deadc87cc10ef76cdecc1e0b54b6d41

SHA256
1c72fa37d078b92c7e900b2e3d17c43c34d936a696a8ddf6c519f4a80308b892

SHA512
2df1f1d45844da7ffb17cdfb411f223e9c614c00f5cf7eb5ba92bf7ba174875af2a515371208286c95c0479c934ae2c6a83dfc0b54380be89db1eddd19faf978

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_zvuprirj.bps.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1236-0-0x00007FFBD86B3000-0x00007FFBD86B5000-memory.dmp

Filesize
8KB

Download
memory/1236-53-0x00007FFBD86B3000-0x00007FFBD86B5000-memory.dmp

Filesize
8KB

Download
memory/1236-1-0x0000000000E50000-0x0000000000E68000-memory.dmp

Filesize
96KB

Download
memory/2372-17-0x00007FFBD86B0000-0x00007FFBD9171000-memory.dmp

Filesize
10.8MB

Download
memory/2372-14-0x00007FFBD86B0000-0x00007FFBD9171000-memory.dmp

Filesize
10.8MB

Download
memory/2372-13-0x00007FFBD86B0000-0x00007FFBD9171000-memory.dmp

Filesize
10.8MB

Download
memory/2372-12-0x00007FFBD86B0000-0x00007FFBD9171000-memory.dmp

Filesize
10.8MB

Download
memory/2372-2-0x0000019D540A0000-0x0000019D540C2000-memory.dmp

Filesize
136KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads