xworm | 637aff987be6ea158b7182de9de5de0054407077511019516270d82a6f2e9b69

General

Target

Runtime Broker.exe
Size

72KB
MD5

89af2aaffc3ddda07a0fc977c8bb2236
SHA1

412bd5812599d5729a51d0350df48030b0d04e1a
SHA256

637aff987be6ea158b7182de9de5de0054407077511019516270d82a6f2e9b69
SHA512

8c2b26d0f1b0ae80149a2aaadef329ab7fb3495bdfbccb7f8ff60368094cd955829b2cb1217b16808ac41a223661d48c2dcf88d3daeddc6b699aa88272be75ae
SSDEEP

1536:b0nLpERHZ5P56srqpbTXw3cYUo6IfI4WOyL6KqGi:bcY7P56tbTXb6IvOyyGi

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

medical-m.gl.at.ply.gg:28857

Attributes

Install_directory
%ProgramData%
install_file
Runtime Broker.exe

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/memory/4084-1-0x00000000006A0000-0x00000000006B8000-memory.dmp	family_xworm
behavioral2/files/0x000b0000000233ec-60.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
4576	powershell.exe
3784	powershell.exe
1588	powershell.exe
4788	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-1-5-21-2539840389-1261165778-1087677076-1000\Control Panel\International\Geo\Nation	Runtime Broker.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	Runtime Broker.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Runtime Broker.lnk	Runtime Broker.exe

Executes dropped EXE 1 IoCs

pid	Process
336	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-1-5-21-2539840389-1261165778-1087677076-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Runtime Broker = "C:\\ProgramData\\Runtime Broker.exe"	Runtime Broker.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
11	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
3596	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
4576	powershell.exe
4576	powershell.exe
3784	powershell.exe
3784	powershell.exe
1588	powershell.exe
1588	powershell.exe
4788	powershell.exe
4788	powershell.exe
4084	Runtime Broker.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	4084	Runtime Broker.exe
Token: SeDebugPrivilege	4576	powershell.exe
Token: SeDebugPrivilege	3784	powershell.exe
Token: SeDebugPrivilege	1588	powershell.exe
Token: SeDebugPrivilege	4788	powershell.exe
Token: SeDebugPrivilege	4084	Runtime Broker.exe
Token: SeDebugPrivilege	336	Runtime Broker.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4084	Runtime Broker.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4084 wrote to memory of 4576	4084	Runtime Broker.exe	88
PID 4084 wrote to memory of 4576	4084	Runtime Broker.exe	88
PID 4084 wrote to memory of 3784	4084	Runtime Broker.exe	90
PID 4084 wrote to memory of 3784	4084	Runtime Broker.exe	90
PID 4084 wrote to memory of 1588	4084	Runtime Broker.exe	92
PID 4084 wrote to memory of 1588	4084	Runtime Broker.exe	92
PID 4084 wrote to memory of 4788	4084	Runtime Broker.exe	94
PID 4084 wrote to memory of 4788	4084	Runtime Broker.exe	94
PID 4084 wrote to memory of 3596	4084	Runtime Broker.exe	96
PID 4084 wrote to memory of 3596	4084	Runtime Broker.exe	96

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\Runtime Broker.exe
"C:\Users\Admin\AppData\Local\Temp\Runtime Broker.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:4084
- 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\Runtime Broker.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4576
- 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:3784
- 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.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1588
- 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:4788
- 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.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3596

C:\ProgramData\Runtime Broker.exe
"C:\ProgramData\Runtime Broker.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:336

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:\ProgramData\Runtime Broker.exe

Filesize
72KB

MD5
89af2aaffc3ddda07a0fc977c8bb2236

SHA1
412bd5812599d5729a51d0350df48030b0d04e1a

SHA256
637aff987be6ea158b7182de9de5de0054407077511019516270d82a6f2e9b69

SHA512
8c2b26d0f1b0ae80149a2aaadef329ab7fb3495bdfbccb7f8ff60368094cd955829b2cb1217b16808ac41a223661d48c2dcf88d3daeddc6b699aa88272be75ae

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
0256bd284691ed0fc502ef3c8a7e58dc

SHA1
dcdf69dc8ca8bf068f65d20ef1563bbe283e2413

SHA256
e2fb83098e114084f51ed7187334f861ce670051046c39f338928296ca9a49cf

SHA512
c5b29c1e0a15ddb68b0579848066774fa7cdc6f35087bbbf47c05a5c0dcc1eb3e61b2ddadfbded8c1ed9820e637596a9f08a97db8fb18000d168e6b159060c42

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

Filesize
944B

MD5
eb033be02578f9635ec47bdc1de5c3fb

SHA1
ec356bc87381354a06baa9c30e8c3ac3d30e0f6f

SHA256
bd827af3192bf83c75a32e51ed2de83bd3b90d6b99350721a189a57cec15d063

SHA512
4d8778503646f7016df73ff9d204760f4fe4d2b24157920ac3e5651653373975b2f2d229530143059f11b16c42822ad7963e628ad6066022ee712c17d90595ed

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_eqb4m30x.xjv.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/3784-31-0x000001A4FBCF0000-0x000001A4FBF0C000-memory.dmp

Filesize
2.1MB

Download
memory/4084-0-0x00007FF9036E3000-0x00007FF9036E5000-memory.dmp

Filesize
8KB

Download
memory/4084-2-0x00007FF9036E0000-0x00007FF9041A1000-memory.dmp

Filesize
10.8MB

Download
memory/4084-1-0x00000000006A0000-0x00000000006B8000-memory.dmp

Filesize
96KB

Download
memory/4084-59-0x00007FF9036E0000-0x00007FF9041A1000-memory.dmp

Filesize
10.8MB

Download
memory/4576-13-0x00007FF9036E0000-0x00007FF9041A1000-memory.dmp

Filesize
10.8MB

Download
memory/4576-18-0x00007FF9036E0000-0x00007FF9041A1000-memory.dmp

Filesize
10.8MB

Download
memory/4576-15-0x00007FF9036E0000-0x00007FF9041A1000-memory.dmp

Filesize
10.8MB

Download
memory/4576-14-0x00007FF9036E0000-0x00007FF9041A1000-memory.dmp

Filesize
10.8MB

Download
memory/4576-8-0x0000026CEC310000-0x0000026CEC332000-memory.dmp

Filesize
136KB

Download
memory/4788-54-0x000001B0FA540000-0x000001B0FA75C000-memory.dmp

Filesize
2.1MB

Download

Resubmissions

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads