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 4 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2892-1-0x00000000013D0000-0x00000000013E0000-memory.dmp	family_xworm
C:\ProgramData\Calculator.exe	family_xworm
behavioral1/memory/1556-36-0x0000000000CD0000-0x0000000000CE0000-memory.dmp	family_xworm
behavioral1/memory/2012-41-0x0000000000F00000-0x0000000000F10000-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

Processes:

powershell.exepowershell.exepowershell.exepowershell.exe

pid process

2648 powershell.exe
2524 powershell.exe
2284 powershell.exe
2884 powershell.exe

pid	process
2648	powershell.exe
2524	powershell.exe
2284	powershell.exe
2884	powershell.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 3 IoCs

Processes:

Calculator.exeCalculator.exeCalculator.exe

pid process

1556 Calculator.exe
2012 Calculator.exe
2064 Calculator.exe

pid	process
1556	Calculator.exe
2012	Calculator.exe
2064	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-1-5-21-2248906074-2862704502-246302768-1000\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

6 pastebin.com
7 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

4 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

2772 schtasks.exe
Suspicious behavior: EnumeratesProcesses 5 IoCs

Processes:

powershell.exepowershell.exepowershell.exepowershell.exeXClient.exe

pid process

2524 powershell.exe
2284 powershell.exe
2884 powershell.exe
2648 powershell.exe
2892 XClient.exe

flow	ioc
6	pastebin.com
7	pastebin.com

flow	ioc
4	ip-api.com

pid	process
2772	schtasks.exe

pid	process
2524	powershell.exe
2284	powershell.exe
2884	powershell.exe
2648	powershell.exe
2892	XClient.exe

Suspicious use of AdjustPrivilegeToken 9 IoCs

Processes:

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

description	pid	process
Token: SeDebugPrivilege	2892	XClient.exe
Token: SeDebugPrivilege	2524	powershell.exe
Token: SeDebugPrivilege	2284	powershell.exe
Token: SeDebugPrivilege	2884	powershell.exe
Token: SeDebugPrivilege	2648	powershell.exe
Token: SeDebugPrivilege	2892	XClient.exe
Token: SeDebugPrivilege	1556	Calculator.exe
Token: SeDebugPrivilege	2012	Calculator.exe
Token: SeDebugPrivilege	2064	Calculator.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

XClient.exe

pid process

2892 XClient.exe

pid	process
2892	XClient.exe

Suspicious use of WriteProcessMemory 24 IoCs

Processes:

XClient.exetaskeng.exe

description	pid	process	target process
PID 2892 wrote to memory of 2524	2892	XClient.exe	powershell.exe
PID 2892 wrote to memory of 2524	2892	XClient.exe	powershell.exe
PID 2892 wrote to memory of 2524	2892	XClient.exe	powershell.exe
PID 2892 wrote to memory of 2284	2892	XClient.exe	powershell.exe
PID 2892 wrote to memory of 2284	2892	XClient.exe	powershell.exe
PID 2892 wrote to memory of 2284	2892	XClient.exe	powershell.exe
PID 2892 wrote to memory of 2884	2892	XClient.exe	powershell.exe
PID 2892 wrote to memory of 2884	2892	XClient.exe	powershell.exe
PID 2892 wrote to memory of 2884	2892	XClient.exe	powershell.exe
PID 2892 wrote to memory of 2648	2892	XClient.exe	powershell.exe
PID 2892 wrote to memory of 2648	2892	XClient.exe	powershell.exe
PID 2892 wrote to memory of 2648	2892	XClient.exe	powershell.exe
PID 2892 wrote to memory of 2772	2892	XClient.exe	schtasks.exe
PID 2892 wrote to memory of 2772	2892	XClient.exe	schtasks.exe
PID 2892 wrote to memory of 2772	2892	XClient.exe	schtasks.exe
PID 1796 wrote to memory of 1556	1796	taskeng.exe	Calculator.exe
PID 1796 wrote to memory of 1556	1796	taskeng.exe	Calculator.exe
PID 1796 wrote to memory of 1556	1796	taskeng.exe	Calculator.exe
PID 1796 wrote to memory of 2012	1796	taskeng.exe	Calculator.exe
PID 1796 wrote to memory of 2012	1796	taskeng.exe	Calculator.exe
PID 1796 wrote to memory of 2012	1796	taskeng.exe	Calculator.exe
PID 1796 wrote to memory of 2064	1796	taskeng.exe	Calculator.exe
PID 1796 wrote to memory of 2064	1796	taskeng.exe	Calculator.exe
PID 1796 wrote to memory of 2064	1796	taskeng.exe	Calculator.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⤵
- 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:2892

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:2524

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:2284

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:2884

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:2648

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:2772

C:\Windows\system32\taskeng.exe
taskeng.exe {905056E0-7255-4A15-B25F-6475F16651F3} S-1-5-21-2248906074-2862704502-246302768-1000:GHPZRGFC\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:1796

C:\ProgramData\Calculator.exe
C:\ProgramData\Calculator.exe
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1556

C:\ProgramData\Calculator.exe
C:\ProgramData\Calculator.exe
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2012

C:\ProgramData\Calculator.exe
C:\ProgramData\Calculator.exe
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2064

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

1

T1012

System Information Discovery

1

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\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
2e5c99b72f8ba81581ad00b8a3337c14

SHA1
4407eec6bd98aa1d023a6d2c8e6ec8e588af3f15

SHA256
5f3ae2fd118d881941f1fa57e4a695e3acbb0015fb9564d88bdf26e5a2997f1b

SHA512
e9360235ea3cab516b4c95f156e2041741e799408db6a53d97ab3066ba9716503ed51dd9c2649d8929de4812e69bd520e51b42ffb88d7b33e77fe00745fb0966

Download Submit
\??\PIPE\srvsvc

MD5
d41d8cd98f00b204e9800998ecf8427e

SHA1
da39a3ee5e6b4b0d3255bfef95601890afd80709

SHA256
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

SHA512
cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e

Download Submit
memory/1556-36-0x0000000000CD0000-0x0000000000CE0000-memory.dmp

Filesize
64KB

Download
memory/2012-41-0x0000000000F00000-0x0000000000F10000-memory.dmp

Filesize
64KB

Download
memory/2284-15-0x000000001B6F0000-0x000000001B9D2000-memory.dmp

Filesize
2.9MB

Download
memory/2284-16-0x0000000001E80000-0x0000000001E88000-memory.dmp

Filesize
32KB

Download
memory/2524-7-0x00000000028C0000-0x0000000002940000-memory.dmp

Filesize
512KB

Download
memory/2524-8-0x000000001B700000-0x000000001B9E2000-memory.dmp

Filesize
2.9MB

Download
memory/2524-9-0x0000000002800000-0x0000000002808000-memory.dmp

Filesize
32KB

Download
memory/2892-2-0x000007FEF5C40000-0x000007FEF662C000-memory.dmp

Filesize
9.9MB

Download
memory/2892-0-0x000007FEF5C43000-0x000007FEF5C44000-memory.dmp

Filesize
4KB

Download
memory/2892-1-0x00000000013D0000-0x00000000013E0000-memory.dmp

Filesize
64KB

Download
memory/2892-37-0x000007FEF5C43000-0x000007FEF5C44000-memory.dmp

Filesize
4KB

Download
memory/2892-38-0x000007FEF5C40000-0x000007FEF662C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads