xworm | 30c6dca8d7298ad8b76d2b4fb29ba10778537df7552e5aeafaad63ffa7287807

Analysis

max time kernel
144s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
05-12-2024 13:34

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General

Target

Skype.exe
Size

74KB
MD5

ab7fe54a2dff556af9d0f6524169f305
SHA1

cfd61fb50874d48900f8a058f2f2500aa4caafeb
SHA256

1947f33f50a76eb1093d5bdbc01979f086dbe1f3e9b8501afc4547ed14ea8b5c
SHA512

e7b054fa38fdce9283dcd2fa8f9e8d0cfae813825a6626582aeb089d53e2fe9bb50a18c145d938006f88b2d87e936600db24ba41d480eb49e8a31b26ada6be8c
SSDEEP

1536:A6hZ2mK295bW4yZWalfT/T+bFXQMRYYPp6+B+ORSH5DWoYd2E:AK995qrZT+bNQzSBB+ORSZDWozE

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

127.0.0.1:7521

chf35s6.localto.net:7521

Attributes

Install_directory
%LocalAppData%
install_file
System.exe

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral8/memory/4988-1-0x0000000000040000-0x0000000000058000-memory.dmp	family_xworm
behavioral8/files/0x000500000001e75a-59.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
64	powershell.exe
2196	powershell.exe
1392	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	Skype.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 3 IoCs

pid	Process
1448	System.exe
708	System.exe
2948	System.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-1-5-21-4089630652-1596403869-279772308-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\System = "C:\\Users\\Admin\\AppData\\Local\\System.exe"	Skype.exe

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
3608	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
2196	powershell.exe
2196	powershell.exe
1392	powershell.exe
1392	powershell.exe
3124	powershell.exe
3124	powershell.exe
64	powershell.exe
64	powershell.exe
4988	Skype.exe

Suspicious use of AdjustPrivilegeToken 9 IoCs

description	pid	Process
Token: SeDebugPrivilege	4988	Skype.exe
Token: SeDebugPrivilege	2196	powershell.exe
Token: SeDebugPrivilege	1392	powershell.exe
Token: SeDebugPrivilege	3124	powershell.exe
Token: SeDebugPrivilege	64	powershell.exe
Token: SeDebugPrivilege	4988	Skype.exe
Token: SeDebugPrivilege	1448	System.exe
Token: SeDebugPrivilege	708	System.exe
Token: SeDebugPrivilege	2948	System.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4988	Skype.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4988 wrote to memory of 2196	4988	Skype.exe	82
PID 4988 wrote to memory of 2196	4988	Skype.exe	82
PID 4988 wrote to memory of 1392	4988	Skype.exe	84
PID 4988 wrote to memory of 1392	4988	Skype.exe	84
PID 4988 wrote to memory of 3124	4988	Skype.exe	86
PID 4988 wrote to memory of 3124	4988	Skype.exe	86
PID 4988 wrote to memory of 64	4988	Skype.exe	88
PID 4988 wrote to memory of 64	4988	Skype.exe	88
PID 4988 wrote to memory of 3608	4988	Skype.exe	92
PID 4988 wrote to memory of 3608	4988	Skype.exe	92

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\Skype.exe
"C:\Users\Admin\AppData\Local\Temp\Skype.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:4988
- 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\Skype.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2196
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Skype.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1392
- 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\System.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3124
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'System.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:64
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "System" /tr "C:\Users\Admin\AppData\Local\System.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3608

C:\Users\Admin\AppData\Local\System.exe
C:\Users\Admin\AppData\Local\System.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1448

C:\Users\Admin\AppData\Local\System.exe
C:\Users\Admin\AppData\Local\System.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:708

C:\Users\Admin\AppData\Local\System.exe
C:\Users\Admin\AppData\Local\System.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2948

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\System.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
6d42b6da621e8df5674e26b799c8e2aa

SHA1
ab3ce1327ea1eeedb987ec823d5e0cb146bafa48

SHA256
5ab6a1726f425c6d0158f55eb8d81754ddedd51e651aa0a899a29b7a58619c4c

SHA512
53faffbda8a835bc1143e894c118c15901a5fd09cfc2224dd2f754c06dc794897315049a579b9a8382d4564f071576045aaaf824019b7139d939152dca38ce29

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
a7cc007980e419d553568a106210549a

SHA1
c03099706b75071f36c3962fcc60a22f197711e0

SHA256
a5735921fc72189c8bf577f3911486cf031708dc8d6bc764fe3e593c0a053165

SHA512
b9aaf29403c467daef80a1ae87478afc33b78f4e1ca16189557011bb83cf9b3e29a0f85c69fa209c45201fb28baca47d31756eee07b79c6312c506e8370f7666

Download Submit
C:\Users\Admin\AppData\Local\System.exe

Filesize
74KB

MD5
ab7fe54a2dff556af9d0f6524169f305

SHA1
cfd61fb50874d48900f8a058f2f2500aa4caafeb

SHA256
1947f33f50a76eb1093d5bdbc01979f086dbe1f3e9b8501afc4547ed14ea8b5c

SHA512
e7b054fa38fdce9283dcd2fa8f9e8d0cfae813825a6626582aeb089d53e2fe9bb50a18c145d938006f88b2d87e936600db24ba41d480eb49e8a31b26ada6be8c

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_sa2kocqc.r0k.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/2196-12-0x00007FFF17D30000-0x00007FFF187F1000-memory.dmp

Filesize
10.8MB

Download
memory/2196-17-0x00007FFF17D30000-0x00007FFF187F1000-memory.dmp

Filesize
10.8MB

Download
memory/2196-14-0x00007FFF17D30000-0x00007FFF187F1000-memory.dmp

Filesize
10.8MB

Download
memory/2196-13-0x00007FFF17D30000-0x00007FFF187F1000-memory.dmp

Filesize
10.8MB

Download
memory/2196-7-0x000001FAE9870000-0x000001FAE9892000-memory.dmp

Filesize
136KB

Download
memory/4988-0-0x00007FFF17D33000-0x00007FFF17D35000-memory.dmp

Filesize
8KB

Download
memory/4988-56-0x00007FFF17D30000-0x00007FFF187F1000-memory.dmp

Filesize
10.8MB

Download
memory/4988-57-0x00007FFF17D33000-0x00007FFF17D35000-memory.dmp

Filesize
8KB

Download
memory/4988-58-0x00007FFF17D30000-0x00007FFF187F1000-memory.dmp

Filesize
10.8MB

Download
memory/4988-1-0x0000000000040000-0x0000000000058000-memory.dmp

Filesize
96KB

Download