xworm | 8af9363b9c2f60c264f19812b287e61accbdf0c4be10e500645ce760fbe5a32a

Analysis

max time kernel
147s
max time network
142s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
25/09/2024, 12:07

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General

Target

Sairiss.exe
Size

1.1MB
MD5

de6f7554479d7c833f7441c00f53a0a4
SHA1

205b9b083f05e4d4e2b9f05971030a4ddbdf034c
SHA256

8af9363b9c2f60c264f19812b287e61accbdf0c4be10e500645ce760fbe5a32a
SHA512

5fbfccec89cc21a7efcf184854ed2ca15b068552d1c86babb972ad4f8b2c6a5acbb7a2339e6d6fe0b3f37766e523d6083c2ce41b401b1364f4a459c1ebecfbc5
SSDEEP

24576:rAM1FHWInxjjPZiHzNAjtIsdE2ajpoRvSNTv/FbpMgS20YX+iXFGKRc+JDke:8MX2In1cXsdEPjs+sR2jrVzRB2e

Score

10^/10

xworm discovery execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Attributes

Install_directory
%Userprofile%
install_file
WindowsUpdate.exe
pastebin_url
https://pastebin.com/raw/imbvawb9

Signatures

Detect Xworm Payload 6 IoCs

resource	yara_rule
behavioral2/memory/4760-2-0x0000000000280000-0x0000000000600000-memory.dmp	family_xworm
behavioral2/memory/1372-143-0x0000000000180000-0x0000000000500000-memory.dmp	family_xworm
behavioral2/memory/1372-148-0x0000000000180000-0x0000000000500000-memory.dmp	family_xworm
behavioral2/memory/540-155-0x0000000000180000-0x0000000000500000-memory.dmp	family_xworm
behavioral2/memory/540-157-0x0000000000180000-0x0000000000500000-memory.dmp	family_xworm
behavioral2/memory/540-160-0x0000000000180000-0x0000000000500000-memory.dmp	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
4592	powershell.exe
4936	powershell.exe
4844	powershell.exe
3736	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-1-5-21-355097885-2402257403-2971294179-1000\Control Panel\International\Geo\Nation	Sairiss.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 2 IoCs

pid	Process
1372	WindowsUpdate.exe
540	WindowsUpdate.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-1-5-21-355097885-2402257403-2971294179-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WindowsUpdate = "C:\\Users\\Admin\\WindowsUpdate.exe"	Sairiss.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 4 IoCs

Web Service

T1102

flow	ioc
21	pastebin.com
22	pastebin.com
28	0.tcp.eu.ngrok.io
44	0.tcp.eu.ngrok.io

Suspicious use of NtSetInformationThreadHideFromDebugger 19 IoCs

pid	Process
4760	Sairiss.exe
4760	Sairiss.exe
4760	Sairiss.exe
4760	Sairiss.exe
4760	Sairiss.exe
4760	Sairiss.exe
4760	Sairiss.exe
1372	WindowsUpdate.exe
4760	Sairiss.exe
4760	Sairiss.exe
4760	Sairiss.exe
4760	Sairiss.exe
4760	Sairiss.exe
4760	Sairiss.exe
540	WindowsUpdate.exe
540	WindowsUpdate.exe
4760	Sairiss.exe
4760	Sairiss.exe
4760	Sairiss.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 8 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WindowsUpdate.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WindowsUpdate.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Sairiss.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe

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
4680	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
4844	powershell.exe
4844	powershell.exe
3736	powershell.exe
3736	powershell.exe
4592	powershell.exe
4592	powershell.exe
4936	powershell.exe
4936	powershell.exe
4760	Sairiss.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	4760	Sairiss.exe
Token: SeDebugPrivilege	4844	powershell.exe
Token: SeDebugPrivilege	3736	powershell.exe
Token: SeDebugPrivilege	4592	powershell.exe
Token: SeDebugPrivilege	4936	powershell.exe
Token: SeDebugPrivilege	4760	Sairiss.exe
Token: SeDebugPrivilege	1372	WindowsUpdate.exe
Token: SeDebugPrivilege	540	WindowsUpdate.exe

Suspicious use of SetWindowsHookEx 4 IoCs

pid	Process
4760	Sairiss.exe
4760	Sairiss.exe
1372	WindowsUpdate.exe
540	WindowsUpdate.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4760 wrote to memory of 4844	4760	Sairiss.exe	82
PID 4760 wrote to memory of 4844	4760	Sairiss.exe	82
PID 4760 wrote to memory of 4844	4760	Sairiss.exe	82
PID 4760 wrote to memory of 3736	4760	Sairiss.exe	88
PID 4760 wrote to memory of 3736	4760	Sairiss.exe	88
PID 4760 wrote to memory of 3736	4760	Sairiss.exe	88
PID 4760 wrote to memory of 4592	4760	Sairiss.exe	91
PID 4760 wrote to memory of 4592	4760	Sairiss.exe	91
PID 4760 wrote to memory of 4592	4760	Sairiss.exe	91
PID 4760 wrote to memory of 4936	4760	Sairiss.exe	93
PID 4760 wrote to memory of 4936	4760	Sairiss.exe	93
PID 4760 wrote to memory of 4936	4760	Sairiss.exe	93
PID 4760 wrote to memory of 4680	4760	Sairiss.exe	97
PID 4760 wrote to memory of 4680	4760	Sairiss.exe	97
PID 4760 wrote to memory of 4680	4760	Sairiss.exe	97

C:\Users\Admin\AppData\Local\Temp\Sairiss.exe
"C:\Users\Admin\AppData\Local\Temp\Sairiss.exe"
1⤵
- Checks computer location settings
- Drops startup file
- Adds Run key to start application
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4760
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\Sairiss.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4844
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Sairiss.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3736
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\WindowsUpdate.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4592
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'WindowsUpdate.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4936
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "WindowsUpdate" /tr "C:\Users\Admin\WindowsUpdate.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:4680

C:\Users\Admin\WindowsUpdate.exe
C:\Users\Admin\WindowsUpdate.exe
1⤵
- Executes dropped EXE
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
PID:1372

C:\Users\Admin\WindowsUpdate.exe
C:\Users\Admin\WindowsUpdate.exe
1⤵
- Executes dropped EXE
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
PID:540

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

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\WindowsUpdate.exe.log

Filesize
522B

MD5
8334a471a4b492ece225b471b8ad2fc8

SHA1
1cb24640f32d23e8f7800bd0511b7b9c3011d992

SHA256
5612afe347d8549cc95a0c710602bcc7d7b224361b613c0a6ba362092300c169

SHA512
56ae2e83355c331b00d782797f5664c2f373eac240e811aab978732503ae05eb20b08730d2427ed90efa5a706d71b42b57153596a45a6b5592e3dd9128b81c36

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
968cb9309758126772781b83adb8a28f

SHA1
8da30e71accf186b2ba11da1797cf67f8f78b47c

SHA256
92099c10776bb7e3f2a8d1b82d4d40d0c4627e4f1bf754a6e58dfd2c2e97042a

SHA512
4bd50732f8af4d688d95999bddfd296115d7033ddc38f86c9fb1f47fde202bffa27e9088bebcaa3064ca946af2f5c1ca6cbde49d0907f0005c7ab42874515dd3

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

Filesize
18KB

MD5
45329b664805131935ce8c6b248769b2

SHA1
5cdb3f919846f3544a1ed66547b4ea8b7547c4a2

SHA256
13ccf1558ffab0b4737651e65ae4c4045f65ce3d0c6f959906805a6ad75745a1

SHA512
0f80ded77c30db45e3e40a15e4b5daedaf3514d53b5fc96e9212dabbe69fed3d33745f322ff9785df236446e685e45c0e1de47649660d363b70ce319c51aa7ad

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

Filesize
18KB

MD5
9bd868d4455eb502b751fd1e26746ae0

SHA1
375a4a638d4c1d83c10a32e5033544edd38f77ff

SHA256
02d16f9b9adb6d949093329aeea2d23255050c9bff2253a403a5046b8490260a

SHA512
7f69a74f4238257e6fa903eb6f22c5508d205254167c92fce75725a59c605e75d2cea2878ec21e730c5633223859ca0b581e3ce4fec52a2aa9f3f5adb785f87e

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

Filesize
18KB

MD5
c00256414f51e8bb298d25efe5538c89

SHA1
8ced6cc105334621f622aced6db8d7e51b74e116

SHA256
5fbbb9308136bb6ff6594b4755f04fe0c8711323d27587721878d75c5b974004

SHA512
10ce5170c58378333020aab2046760f7a955a0c86698c51091bced390b574985048a5570cd7768eb0c9ad27523980be75bb6223e30765adb8d86701eb9730463

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_5eozdwjd.xrm.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\WindowsUpdate.exe

Filesize
1.1MB

MD5
de6f7554479d7c833f7441c00f53a0a4

SHA1
205b9b083f05e4d4e2b9f05971030a4ddbdf034c

SHA256
8af9363b9c2f60c264f19812b287e61accbdf0c4be10e500645ce760fbe5a32a

SHA512
5fbfccec89cc21a7efcf184854ed2ca15b068552d1c86babb972ad4f8b2c6a5acbb7a2339e6d6fe0b3f37766e523d6083c2ce41b401b1364f4a459c1ebecfbc5

Download Submit
memory/540-160-0x0000000000180000-0x0000000000500000-memory.dmp

Filesize
3.5MB

Download
memory/540-155-0x0000000000180000-0x0000000000500000-memory.dmp

Filesize
3.5MB

Download
memory/540-157-0x0000000000180000-0x0000000000500000-memory.dmp

Filesize
3.5MB

Download
memory/1372-148-0x0000000000180000-0x0000000000500000-memory.dmp

Filesize
3.5MB

Download
memory/1372-143-0x0000000000180000-0x0000000000500000-memory.dmp

Filesize
3.5MB

Download
memory/1372-141-0x0000000000180000-0x0000000000500000-memory.dmp

Filesize
3.5MB

Download
memory/3736-58-0x00000000056D0000-0x0000000005A24000-memory.dmp

Filesize
3.3MB

Download
memory/3736-57-0x0000000074900000-0x00000000750B0000-memory.dmp

Filesize
7.7MB

Download
memory/3736-69-0x00000000705C0000-0x000000007060C000-memory.dmp

Filesize
304KB

Download
memory/3736-81-0x0000000074900000-0x00000000750B0000-memory.dmp

Filesize
7.7MB

Download
memory/3736-55-0x0000000074900000-0x00000000750B0000-memory.dmp

Filesize
7.7MB

Download
memory/3736-56-0x0000000074900000-0x00000000750B0000-memory.dmp

Filesize
7.7MB

Download
memory/4592-91-0x0000000005530000-0x0000000005884000-memory.dmp

Filesize
3.3MB

Download
memory/4592-93-0x00000000705C0000-0x000000007060C000-memory.dmp

Filesize
304KB

Download
memory/4760-43-0x000000007490E000-0x000000007490F000-memory.dmp

Filesize
4KB

Download
memory/4760-40-0x0000000000280000-0x0000000000600000-memory.dmp

Filesize
3.5MB

Download
memory/4760-131-0x0000000007200000-0x00000000077A4000-memory.dmp

Filesize
5.6MB

Download
memory/4760-132-0x0000000006F20000-0x0000000006FB2000-memory.dmp

Filesize
584KB

Download
memory/4760-133-0x0000000006F10000-0x0000000006F1A000-memory.dmp

Filesize
40KB

Download
memory/4760-130-0x0000000074900000-0x00000000750B0000-memory.dmp

Filesize
7.7MB

Download
memory/4760-0-0x0000000000280000-0x0000000000600000-memory.dmp

Filesize
3.5MB

Download
memory/4760-135-0x0000000074900000-0x00000000750B0000-memory.dmp

Filesize
7.7MB

Download
memory/4760-139-0x00000000080F0000-0x00000000080FC000-memory.dmp

Filesize
48KB

Download
memory/4760-3-0x0000000005AA0000-0x0000000005B3C000-memory.dmp

Filesize
624KB

Download
memory/4760-2-0x0000000000280000-0x0000000000600000-memory.dmp

Filesize
3.5MB

Download
memory/4760-1-0x000000007490E000-0x000000007490F000-memory.dmp

Filesize
4KB

Download
memory/4844-23-0x00000000061B0000-0x00000000061FC000-memory.dmp

Filesize
304KB

Download
memory/4844-11-0x0000000005A70000-0x0000000005AD6000-memory.dmp

Filesize
408KB

Download
memory/4844-50-0x0000000007780000-0x0000000007788000-memory.dmp

Filesize
32KB

Download
memory/4844-49-0x00000000077A0000-0x00000000077BA000-memory.dmp

Filesize
104KB

Download
memory/4844-48-0x00000000076A0000-0x00000000076B4000-memory.dmp

Filesize
80KB

Download
memory/4844-47-0x0000000007690000-0x000000000769E000-memory.dmp

Filesize
56KB

Download
memory/4844-46-0x0000000007660000-0x0000000007671000-memory.dmp

Filesize
68KB

Download
memory/4844-45-0x00000000076E0000-0x0000000007776000-memory.dmp

Filesize
600KB

Download
memory/4844-44-0x00000000074D0000-0x00000000074DA000-memory.dmp

Filesize
40KB

Download
memory/4844-41-0x0000000007AB0000-0x000000000812A000-memory.dmp

Filesize
6.5MB

Download
memory/4844-42-0x0000000007460000-0x000000000747A000-memory.dmp

Filesize
104KB

Download
memory/4844-39-0x0000000074900000-0x00000000750B0000-memory.dmp

Filesize
7.7MB

Download
memory/4844-38-0x0000000074900000-0x00000000750B0000-memory.dmp

Filesize
7.7MB

Download
memory/4844-4-0x0000000004B80000-0x0000000004BB6000-memory.dmp

Filesize
216KB

Download
memory/4844-37-0x0000000007130000-0x00000000071D3000-memory.dmp

Filesize
652KB

Download
memory/4844-5-0x0000000074900000-0x00000000750B0000-memory.dmp

Filesize
7.7MB

Download
memory/4844-36-0x00000000066F0000-0x000000000670E000-memory.dmp

Filesize
120KB

Download
memory/4844-24-0x00000000070F0000-0x0000000007122000-memory.dmp

Filesize
200KB

Download
memory/4844-25-0x0000000074900000-0x00000000750B0000-memory.dmp

Filesize
7.7MB

Download
memory/4844-26-0x00000000705C0000-0x000000007060C000-memory.dmp

Filesize
304KB

Download
memory/4844-22-0x0000000006120000-0x000000000613E000-memory.dmp

Filesize
120KB

Download
memory/4844-21-0x0000000005B30000-0x0000000005E84000-memory.dmp

Filesize
3.3MB

Download
memory/4844-53-0x0000000074900000-0x00000000750B0000-memory.dmp

Filesize
7.7MB

Download
memory/4844-10-0x0000000005990000-0x00000000059F6000-memory.dmp

Filesize
408KB

Download
memory/4844-9-0x0000000005180000-0x00000000051A2000-memory.dmp

Filesize
136KB

Download
memory/4844-8-0x0000000074900000-0x00000000750B0000-memory.dmp

Filesize
7.7MB

Download
memory/4844-7-0x0000000074900000-0x00000000750B0000-memory.dmp

Filesize
7.7MB

Download
memory/4844-6-0x0000000005360000-0x0000000005988000-memory.dmp

Filesize
6.2MB

Download
memory/4936-115-0x00000000705C0000-0x000000007060C000-memory.dmp

Filesize
304KB

Download
memory/4936-113-0x0000000005880000-0x0000000005BD4000-memory.dmp

Filesize
3.3MB

Download