xworm | 455c691649fb976fe7c7c1c816b97972c1826e3f053e483cdeaea9a839b05944

Analysis

max time kernel
147s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
30-06-2024 01:49

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General

Target

e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.exe
Size

230KB
MD5

3db7f780cfc50d086820b95947a61e59
SHA1

d0d31e30bf5f0b39229fb6db2bd73a42ab61eb9d
SHA256

e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f
SHA512

36f184e595612b65563e8b578b3b319716e516d140aef7aa6afae786b036c77b0cc99a2a2cd94cbd548dcfcf82554a891eec0d0d7973a59be5e85606f172dfd8
SSDEEP

6144:y2lnab4waqIUhcX7elbKTua9bfF/H9d9n:blHqI3X3u+

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

154.197.69.131:7005

Attributes

Install_directory
%AppData%
install_file
crss.exe

Signatures

Detect Xworm Payload 2 IoCs

Processes:

resource yara_rule

behavioral2/memory/2544-1-0x0000000000A50000-0x0000000000A8E000-memory.dmp family_xworm
C:\Users\Admin\AppData\Roaming\crss.exe 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

Processes:

powershell.exepowershell.exepowershell.exepowershell.exe

pid process

3496 powershell.exe
3608 powershell.exe
3196 powershell.exe
5012 powershell.exe

resource	yara_rule
behavioral2/memory/2544-1-0x0000000000A50000-0x0000000000A8E000-memory.dmp	family_xworm
C:\Users\Admin\AppData\Roaming\crss.exe	family_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

Processes:

e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1337824034-2731376981-3755436523-1000\Control Panel\International\Geo\Nation	e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.exe

Drops startup file 2 IoCs

Processes:

e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.exe

description	ioc	process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\crss.lnk	e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\crss.lnk	e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.exe

Executes dropped EXE 2 IoCs

Processes:

crss.execrss.exe

pid process

612 crss.exe
1616 crss.exe

pid	process
612	crss.exe
1616	crss.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-1337824034-2731376981-3755436523-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\crss = "C:\\Users\\Admin\\AppData\\Roaming\\crss.exe"	e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.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.

Processes:

flow ioc

2 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

Processes:

schtasks.exe

pid process

1676 schtasks.exe

flow	ioc
2	ip-api.com

pid	process
1676	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

Processes:

powershell.exepowershell.exepowershell.exepowershell.exee2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.exe

pid	process
3496	powershell.exe
3496	powershell.exe
3608	powershell.exe
3608	powershell.exe
3196	powershell.exe
3196	powershell.exe
5012	powershell.exe
5012	powershell.exe
2544	e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

Processes:

e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.exepowershell.exepowershell.exepowershell.exepowershell.execrss.execrss.exe

description	pid	process
Token: SeDebugPrivilege	2544	e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.exe
Token: SeDebugPrivilege	3496	powershell.exe
Token: SeDebugPrivilege	3608	powershell.exe
Token: SeDebugPrivilege	3196	powershell.exe
Token: SeDebugPrivilege	5012	powershell.exe
Token: SeDebugPrivilege	2544	e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.exe
Token: SeDebugPrivilege	612	crss.exe
Token: SeDebugPrivilege	1616	crss.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.exe

pid process

2544 e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.exe

pid	process
2544	e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.exe

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.exe

description	pid	process	target process
PID 2544 wrote to memory of 3496	2544	e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.exe	powershell.exe
PID 2544 wrote to memory of 3496	2544	e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.exe	powershell.exe
PID 2544 wrote to memory of 3608	2544	e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.exe	powershell.exe
PID 2544 wrote to memory of 3608	2544	e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.exe	powershell.exe
PID 2544 wrote to memory of 3196	2544	e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.exe	powershell.exe
PID 2544 wrote to memory of 3196	2544	e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.exe	powershell.exe
PID 2544 wrote to memory of 5012	2544	e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.exe	powershell.exe
PID 2544 wrote to memory of 5012	2544	e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.exe	powershell.exe
PID 2544 wrote to memory of 1676	2544	e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.exe	schtasks.exe
PID 2544 wrote to memory of 1676	2544	e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.exe	schtasks.exe

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\e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.exe
"C:\Users\Admin\AppData\Local\Temp\e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.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:2544

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\e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.exe'
2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3496

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f.exe'
2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3608

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\Roaming\crss.exe'
2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3196

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'crss.exe'
2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:5012

C:\Windows\System32\schtasks.exe
"C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "crss" /tr "C:\Users\Admin\AppData\Roaming\crss.exe"
2⤵
- Scheduled Task/Job: Scheduled Task
PID:1676

C:\Users\Admin\AppData\Roaming\crss.exe
C:\Users\Admin\AppData\Roaming\crss.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:612

C:\Users\Admin\AppData\Roaming\crss.exe
C:\Users\Admin\AppData\Roaming\crss.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1616

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\crss.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
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
ba169f4dcbbf147fe78ef0061a95e83b

SHA1
92a571a6eef49fff666e0f62a3545bcd1cdcda67

SHA256
5ef1421e19fde4bc03cd825dd7d6c0e7863f85fd8f0aa4a4d4f8d555dc7606d1

SHA512
8d2e5e552210dcda684682538bc964fdd8a8ff5b24cc2cc8af813729f0202191f98eb42d38d2355df17ae620fe401aad6ceaedaed3b112fdacd32485a3a0c07c

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_wkkk0vty.idr.ps1
Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Roaming\crss.exe
Filesize
230KB

MD5
3db7f780cfc50d086820b95947a61e59

SHA1
d0d31e30bf5f0b39229fb6db2bd73a42ab61eb9d

SHA256
e2a569f0f5168d11500b6e5f5c0ad0c900c45be7cbab68f0c354318123bf942f

SHA512
36f184e595612b65563e8b578b3b319716e516d140aef7aa6afae786b036c77b0cc99a2a2cd94cbd548dcfcf82554a891eec0d0d7973a59be5e85606f172dfd8

Download Submit
memory/2544-1-0x0000000000A50000-0x0000000000A8E000-memory.dmp

Filesize
248KB

Download
memory/2544-2-0x00007FFA4C3A0000-0x00007FFA4CE61000-memory.dmp

Filesize
10.8MB

Download
memory/2544-0-0x00007FFA4C3A3000-0x00007FFA4C3A5000-memory.dmp

Filesize
8KB

Download
memory/2544-57-0x00007FFA4C3A0000-0x00007FFA4CE61000-memory.dmp

Filesize
10.8MB

Download
memory/3496-9-0x00007FFA4C3A0000-0x00007FFA4CE61000-memory.dmp

Filesize
10.8MB

Download
memory/3496-18-0x00007FFA4C3A0000-0x00007FFA4CE61000-memory.dmp

Filesize
10.8MB

Download
memory/3496-15-0x00007FFA4C3A0000-0x00007FFA4CE61000-memory.dmp

Filesize
10.8MB

Download
memory/3496-14-0x00007FFA4C3A0000-0x00007FFA4CE61000-memory.dmp

Filesize
10.8MB

Download
memory/3496-3-0x000002329A410000-0x000002329A432000-memory.dmp

Filesize
136KB

Download