xworm | 4288137e125d257cce26bdabf57533f03f8aa7476ab6f3c33bc009d3a9f81df0

General

Target

RuntimeBroker.exe
Size

77KB
MD5

7f3d8bc2d995a6d0780aeb80c3172a82
SHA1

781de6ee7e83ce7d159031f16e9677d7aff91516
SHA256

4288137e125d257cce26bdabf57533f03f8aa7476ab6f3c33bc009d3a9f81df0
SHA512

a6997ecde20919abc259b37bd8352b79908e0a0aab6a78cb8293d676e1249af66deeffd8d545227b17513f725a22f0503fa321403cf3c4f40811f8d58cce87cd
SSDEEP

1536:N0A5d1cL+IvRpH4/NbbnjIvUG64OeTIOMbeeSTuX1kC47:NDq5pHyNb3MdTIOweeIK1kP7

Score

10^/10

xworm persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

K1NGonTop-39501.portmap.io:39501

<Xwormmm>:1

Attributes

Install_directory
%Public%
install_file
RuntimeBroker.exe

Signatures

Contains code to disable Windows Defender 1 IoCs

A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

resource	yara_rule
behavioral2/memory/744-69-0x000000001EC40000-0x000000001EC4E000-memory.dmp	disable_win_def

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/memory/744-0-0x0000000000270000-0x0000000000288000-memory.dmp	family_xworm
behavioral2/files/0x000400000001e48b-70.dat	family_xworm

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

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-1-5-21-3803511929-1339359695-2191195476-1000\Control Panel\International\Geo\Nation	RuntimeBroker.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 1 IoCs

pid	Process
5116	RuntimeBroker.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-1-5-21-3803511929-1339359695-2191195476-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "C:\\Users\\Public\\RuntimeBroker.exe"	RuntimeBroker.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

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
1848	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
4744	timeout.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
744	RuntimeBroker.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
3800	powershell.exe
3800	powershell.exe
2684	powershell.exe
2684	powershell.exe
3704	powershell.exe
3704	powershell.exe
4480	powershell.exe
4480	powershell.exe
744	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	744	RuntimeBroker.exe
Token: SeDebugPrivilege	3800	powershell.exe
Token: SeDebugPrivilege	2684	powershell.exe
Token: SeDebugPrivilege	3704	powershell.exe
Token: SeDebugPrivilege	4480	powershell.exe
Token: SeDebugPrivilege	744	RuntimeBroker.exe
Token: SeDebugPrivilege	5116	RuntimeBroker.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
744	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 744 wrote to memory of 3800	744	RuntimeBroker.exe	87
PID 744 wrote to memory of 3800	744	RuntimeBroker.exe	87
PID 744 wrote to memory of 2684	744	RuntimeBroker.exe	89
PID 744 wrote to memory of 2684	744	RuntimeBroker.exe	89
PID 744 wrote to memory of 3704	744	RuntimeBroker.exe	91
PID 744 wrote to memory of 3704	744	RuntimeBroker.exe	91
PID 744 wrote to memory of 4480	744	RuntimeBroker.exe	94
PID 744 wrote to memory of 4480	744	RuntimeBroker.exe	94
PID 744 wrote to memory of 1848	744	RuntimeBroker.exe	97
PID 744 wrote to memory of 1848	744	RuntimeBroker.exe	97
PID 744 wrote to memory of 2124	744	RuntimeBroker.exe	105
PID 744 wrote to memory of 2124	744	RuntimeBroker.exe	105
PID 744 wrote to memory of 3960	744	RuntimeBroker.exe	106
PID 744 wrote to memory of 3960	744	RuntimeBroker.exe	106
PID 3960 wrote to memory of 4744	3960	cmd.exe	109
PID 3960 wrote to memory of 4744	3960	cmd.exe	109

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
- Drops startup file
- 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:744
- 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⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3800
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'RuntimeBroker.exe'
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2684
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Public\RuntimeBroker.exe'
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3704
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'RuntimeBroker.exe'
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4480
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "RuntimeBroker" /tr "C:\Users\Public\RuntimeBroker.exe"
  2⤵
  - Creates scheduled task(s)
  PID:1848
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /delete /f /tn "RuntimeBroker"
  2⤵
  PID:2124
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp3350.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3960
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:4744

C:\Users\Public\RuntimeBroker.exe
C:\Users\Public\RuntimeBroker.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:5116

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

Scheduled Task/Job

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

Scheduled Task/Job

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

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\RuntimeBroker.exe.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
d28a889fd956d5cb3accfbaf1143eb6f

SHA1
157ba54b365341f8ff06707d996b3635da8446f7

SHA256
21e5d7ccf80a293e6ba30ed728846ca19c929c52b96e2c8d34e27cd2234f1d45

SHA512
0b6d88deb9be85722e6a78d5886d49f2caf407a59e128d2b4ed74c1356f9928c40048a62731959f2460e9ff9d9feee311043d2a37abe3bb92c2b76a44281478c

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

Filesize
944B

MD5
22310ad6749d8cc38284aa616efcd100

SHA1
440ef4a0a53bfa7c83fe84326a1dff4326dcb515

SHA256
55b1d8021c4eb4c3c0d75e3ed7a4eb30cd0123e3d69f32eeb596fe4ffec05abf

SHA512
2ef08e2ee15bb86695fe0c10533014ffed76ececc6e579d299d3365fafb7627f53e32e600bb6d872b9f58aca94f8cb7e1e94cdfd14777527f7f0aa019d9c6def

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_dum3kjmf.vtn.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp3350.tmp.bat

Filesize
165B

MD5
820dbe2316d8d905923b6c5e96faac10

SHA1
029f4610ceaa6eccbb8c9f30dd11243036a37fd3

SHA256
4088887392860b57c03fc8b7868499a8d7f0f46ef8506cf6435a1cd47d2f7c70

SHA512
52a3cd14746aebea84948bb73987142c755bb2e71de2f39d3e2584269000e1f3fb53880c7fa9524306fe2be540c72c271626aa80abc4e43406e1e6e0ed3b9432

Download Submit
C:\Users\Public\RuntimeBroker.exe

Filesize
77KB

MD5
7f3d8bc2d995a6d0780aeb80c3172a82

SHA1
781de6ee7e83ce7d159031f16e9677d7aff91516

SHA256
4288137e125d257cce26bdabf57533f03f8aa7476ab6f3c33bc009d3a9f81df0

SHA512
a6997ecde20919abc259b37bd8352b79908e0a0aab6a78cb8293d676e1249af66deeffd8d545227b17513f725a22f0503fa321403cf3c4f40811f8d58cce87cd

Download Submit
memory/744-1-0x00007FFCF94A0000-0x00007FFCF9F61000-memory.dmp

Filesize
10.8MB

Download
memory/744-80-0x00007FFCF94A0000-0x00007FFCF9F61000-memory.dmp

Filesize
10.8MB

Download
memory/744-0-0x0000000000270000-0x0000000000288000-memory.dmp

Filesize
96KB

Download
memory/744-69-0x000000001EC40000-0x000000001EC4E000-memory.dmp

Filesize
56KB

Download
memory/744-68-0x00007FFCF94A0000-0x00007FFCF9F61000-memory.dmp

Filesize
10.8MB

Download
memory/2684-20-0x000002B2DCE70000-0x000002B2DCE80000-memory.dmp

Filesize
64KB

Download
memory/2684-33-0x00007FFCF94A0000-0x00007FFCF9F61000-memory.dmp

Filesize
10.8MB

Download
memory/2684-27-0x000002B2DCE70000-0x000002B2DCE80000-memory.dmp

Filesize
64KB

Download
memory/2684-19-0x00007FFCF94A0000-0x00007FFCF9F61000-memory.dmp

Filesize
10.8MB

Download
memory/3704-43-0x00007FFCF94A0000-0x00007FFCF9F61000-memory.dmp

Filesize
10.8MB

Download
memory/3704-44-0x000001DE22E10000-0x000001DE22E20000-memory.dmp

Filesize
64KB

Download
memory/3704-45-0x000001DE22E10000-0x000001DE22E20000-memory.dmp

Filesize
64KB

Download
memory/3704-48-0x00007FFCF94A0000-0x00007FFCF9F61000-memory.dmp

Filesize
10.8MB

Download
memory/3800-17-0x00007FFCF94A0000-0x00007FFCF9F61000-memory.dmp

Filesize
10.8MB

Download
memory/3800-14-0x000001BD3F2B0000-0x000001BD3F2C0000-memory.dmp

Filesize
64KB

Download
memory/3800-13-0x000001BD3F2B0000-0x000001BD3F2C0000-memory.dmp

Filesize
64KB

Download
memory/3800-12-0x00007FFCF94A0000-0x00007FFCF9F61000-memory.dmp

Filesize
10.8MB

Download
memory/3800-7-0x000001BD3F240000-0x000001BD3F262000-memory.dmp

Filesize
136KB

Download
memory/4480-49-0x00007FFCF94A0000-0x00007FFCF9F61000-memory.dmp

Filesize
10.8MB

Download
memory/4480-63-0x00007FFCF94A0000-0x00007FFCF9F61000-memory.dmp

Filesize
10.8MB

Download
memory/4480-51-0x0000017641710000-0x0000017641720000-memory.dmp

Filesize
64KB

Download
memory/4480-50-0x0000017641710000-0x0000017641720000-memory.dmp

Filesize
64KB

Download
memory/5116-72-0x00007FFCF94A0000-0x00007FFCF9F61000-memory.dmp

Filesize
10.8MB

Download
memory/5116-74-0x00007FFCF94A0000-0x00007FFCF9F61000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads