xworm | 43de230c095246934152c04d5d48751994b1f20bd08f1e5bb5738a15e3503514

General

Target

XClient.exe
Size

41KB
MD5

f67bb681d3527e1285c2138c3e60e414
SHA1

70ba55b2f36c47606f1c7835df04a4964ff36757
SHA256

43de230c095246934152c04d5d48751994b1f20bd08f1e5bb5738a15e3503514
SHA512

b82983acd04d66abf86f8a59c8dd1901809b8314a5c7dc9fa2c758492cb57dfe4ef06134be2d0f08d52ba049119ace9c90bfb83829215da38c5962815f880ca5
SSDEEP

768:lU0MO0OwERFUa+s91Q7fRaYVO8MoJpJIF5PG9nelX6vOwh535iN:lU0M/5ET9zvy0Hfo3aFI9eB6vOwn8N

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Version

5.0

Mutex

IfHxsdPplu71cY72

Attributes

Install_directory
%ProgramData%
install_file
Calculator.exe
pastebin_url
https://pastebin.com/raw/WrxExzm8

aes.plain

Signatures

Detect Xworm Payload 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/5064-1-0x0000000000C50000-0x0000000000C60000-memory.dmp	family_xworm
C:\ProgramData\Calculator.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

3616 powershell.exe
4228 powershell.exe
4556 powershell.exe
4904 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

Processes:

XClient.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\Control Panel\International\Geo\Nation	XClient.exe

Drops startup file 2 IoCs

Processes:

XClient.exe

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

Executes dropped EXE 2 IoCs

Processes:

Calculator.exeCalculator.exe

pid process

3984 Calculator.exe
4712 Calculator.exe

pid	process
3984	Calculator.exe
4712	Calculator.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

XClient.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Calculator = "C:\\ProgramData\\Calculator.exe"	XClient.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service
T1102

Processes:

flow ioc

23 pastebin.com
24 pastebin.com
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

7 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

Processes:

schtasks.exe

pid process

3952 schtasks.exe

flow	ioc
23	pastebin.com
24	pastebin.com

flow	ioc
7	ip-api.com

pid	process
3952	schtasks.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

Processes:

powershell.exepowershell.exepowershell.exepowershell.exeXClient.exe

pid	process
3616	powershell.exe
3616	powershell.exe
4228	powershell.exe
4228	powershell.exe
4556	powershell.exe
4556	powershell.exe
4904	powershell.exe
4904	powershell.exe
5064	XClient.exe
5064	XClient.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

Processes:

XClient.exepowershell.exepowershell.exepowershell.exepowershell.exeCalculator.exeCalculator.exe

description	pid	process
Token: SeDebugPrivilege	5064	XClient.exe
Token: SeDebugPrivilege	3616	powershell.exe
Token: SeDebugPrivilege	4228	powershell.exe
Token: SeDebugPrivilege	4556	powershell.exe
Token: SeDebugPrivilege	4904	powershell.exe
Token: SeDebugPrivilege	5064	XClient.exe
Token: SeDebugPrivilege	3984	Calculator.exe
Token: SeDebugPrivilege	4712	Calculator.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

XClient.exe

pid process

5064 XClient.exe

pid	process
5064	XClient.exe

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

XClient.exe

description	pid	process	target process
PID 5064 wrote to memory of 3616	5064	XClient.exe	powershell.exe
PID 5064 wrote to memory of 3616	5064	XClient.exe	powershell.exe
PID 5064 wrote to memory of 4228	5064	XClient.exe	powershell.exe
PID 5064 wrote to memory of 4228	5064	XClient.exe	powershell.exe
PID 5064 wrote to memory of 4556	5064	XClient.exe	powershell.exe
PID 5064 wrote to memory of 4556	5064	XClient.exe	powershell.exe
PID 5064 wrote to memory of 4904	5064	XClient.exe	powershell.exe
PID 5064 wrote to memory of 4904	5064	XClient.exe	powershell.exe
PID 5064 wrote to memory of 3952	5064	XClient.exe	schtasks.exe
PID 5064 wrote to memory of 3952	5064	XClient.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\XClient.exe
"C:\Users\Admin\AppData\Local\Temp\XClient.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:5064

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\XClient.exe'
2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3616

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'XClient.exe'
2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:4228

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\ProgramData\Calculator.exe'
2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:4556

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Calculator.exe'
2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:4904

C:\Windows\System32\schtasks.exe
"C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "Calculator" /tr "C:\ProgramData\Calculator.exe"
2⤵
- Creates scheduled task(s)
PID:3952

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=3904 --field-trial-handle=2656,i,16940681401824032220,151921362336696246,262144 --variations-seed-version /prefetch:8
1⤵
PID:1376

C:\ProgramData\Calculator.exe
C:\ProgramData\Calculator.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3984

C:\ProgramData\Calculator.exe
C:\ProgramData\Calculator.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4712

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

Scheduled Task/Job

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

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\ProgramData\Calculator.exe

Filesize
41KB

MD5
f67bb681d3527e1285c2138c3e60e414

SHA1
70ba55b2f36c47606f1c7835df04a4964ff36757

SHA256
43de230c095246934152c04d5d48751994b1f20bd08f1e5bb5738a15e3503514

SHA512
b82983acd04d66abf86f8a59c8dd1901809b8314a5c7dc9fa2c758492cb57dfe4ef06134be2d0f08d52ba049119ace9c90bfb83829215da38c5962815f880ca5

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Calculator.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
2e907f77659a6601fcc408274894da2e

SHA1
9f5b72abef1cd7145bf37547cdb1b9254b4efe9d

SHA256
385da35673330e21ac02545220552fe301fe54dedefbdafc097ac4342a295233

SHA512
34fa0fff24f6550f55f828541aaefe5d75c86f8f0842d54b50065e9746f9662bb7209c74c9a9571540b9855bb3851f01db613190024e89b198d485bb5dc07721

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

Filesize
944B

MD5
9a2c763c5ff40e18e49ad63c7c3b0088

SHA1
4b289ea34755323fa869da6ad6480d8d12385a36

SHA256
517807921c55bd16cd8a8bfae3d5dc19444c66f836b66acd5593e3080acbaf8e

SHA512
3af01926bc7de92076067d158d7250b206d396b3282ee0db43639d04d91bd9ff763acbce12c7822914824984a3c5fdd1b8dbf1ad2ee88233d47f0f808b746bc8

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

Filesize
944B

MD5
e5663972c1caaba7088048911c758bf3

SHA1
3462dea0f9c2c16a9c3afdaef8bbb1f753c1c198

SHA256
9f7f29a4696876cadca3f14d7e43f9ede0c97fd64be3f5d94bda49a91b6a419e

SHA512
ff4e72c46cf083de62baa2ce2661555dd91b5f144294015f7b262fd4500cb67fe80e1871a82da63b607e3e9cef401f4b73c587bf1134637881ecad51aad1eddc

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_nkewtzxw.tqa.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/3616-10-0x00007FFCA3100000-0x00007FFCA3BC1000-memory.dmp

Filesize
10.8MB

Download
memory/3616-8-0x000001F0F48C0000-0x000001F0F48E2000-memory.dmp

Filesize
136KB

Download
memory/3616-17-0x00007FFCA3100000-0x00007FFCA3BC1000-memory.dmp

Filesize
10.8MB

Download
memory/3616-20-0x000001F0F4A50000-0x000001F0F4BBA000-memory.dmp

Filesize
1.4MB

Download
memory/3616-21-0x00007FFCA3100000-0x00007FFCA3BC1000-memory.dmp

Filesize
10.8MB

Download
memory/3616-15-0x00007FFCA3100000-0x00007FFCA3BC1000-memory.dmp

Filesize
10.8MB

Download
memory/3616-14-0x00007FFCA3100000-0x00007FFCA3BC1000-memory.dmp

Filesize
10.8MB

Download
memory/3616-16-0x00007FFCA3100000-0x00007FFCA3BC1000-memory.dmp

Filesize
10.8MB

Download
memory/4228-34-0x0000024B56000000-0x0000024B5616A000-memory.dmp

Filesize
1.4MB

Download
memory/5064-0-0x00007FFCA3103000-0x00007FFCA3105000-memory.dmp

Filesize
8KB

Download
memory/5064-61-0x00007FFCA3103000-0x00007FFCA3105000-memory.dmp

Filesize
8KB

Download
memory/5064-62-0x00007FFCA3100000-0x00007FFCA3BC1000-memory.dmp

Filesize
10.8MB

Download
memory/5064-2-0x00007FFCA3100000-0x00007FFCA3BC1000-memory.dmp

Filesize
10.8MB

Download
memory/5064-1-0x0000000000C50000-0x0000000000C60000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads