Malware Analysis Report

2024-10-19 02:30

Sample ID 241014-p35dfswejd
Target AvastSvcZEg.zip
SHA256 72a7b8fe4b8401120124e8f9460bfd457fbf76b70a0c057b58ff271c5b2aadca
Tags
plugx discovery persistence trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

72a7b8fe4b8401120124e8f9460bfd457fbf76b70a0c057b58ff271c5b2aadca

Threat Level: Known bad

The file AvastSvcZEg.zip was found to be: Known bad.

Malicious Activity Summary

plugx discovery persistence trojan

PlugX

Executes dropped EXE

Loads dropped DLL

Adds Run key to start application

Enumerates connected drives

System Location Discovery: System Language Discovery

Unsigned PE

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

Modifies registry class

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-10-14 12:52

Signatures

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-10-14 12:52

Reported

2024-10-14 12:53

Platform

win10v2004-20241007-en

Max time kernel

39s

Max time network

41s

Command Line

cmd /c C:\Users\Admin\AppData\Local\Temp\AvastSvcZEg\AvastSvc.exe

Signatures

PlugX

trojan plugx

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\ProgramData\AvastSvcZEg\AvastSvc.exe N/A

Loads dropped DLL

Description Indicator Process Target
N/A N/A C:\ProgramData\AvastSvcZEg\AvastSvc.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\AvastSvcZEg = "\"C:\\ProgramData\\AvastSvcZEg\\AvastSvc.exe\" 303" C:\Users\Admin\AppData\Local\Temp\AvastSvcZEg\AvastSvc.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\AvastSvcZEg = "\"C:\\ProgramData\\AvastSvcZEg\\AvastSvc.exe\" 303" C:\Users\Admin\AppData\Local\Temp\AvastSvcZEg\AvastSvc.exe N/A

Enumerates connected drives

Description Indicator Process Target
File opened (read-only) \??\D: C:\ProgramData\AvastSvcZEg\AvastSvc.exe N/A
File opened (read-only) \??\F: C:\ProgramData\AvastSvcZEg\AvastSvc.exe N/A

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\AvastSvcZEg\AvastSvc.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\ProgramData\AvastSvcZEg\AvastSvc.exe N/A

Modifies registry class

Description Indicator Process Target
Set value (data) \REGISTRY\MACHINE\SOFTWARE\Classes\ms-pu\CLSID = 39003500360036003200460044004100380044003200340030003300390032000000 C:\Users\Admin\AppData\Local\Temp\AvastSvcZEg\AvastSvc.exe N/A
Key created \REGISTRY\MACHINE\Software\CLASSES\ms-pu C:\ProgramData\AvastSvcZEg\AvastSvc.exe N/A
Key created \REGISTRY\MACHINE\Software\CLASSES\ms-pu\PROXY C:\ProgramData\AvastSvcZEg\AvastSvc.exe N/A
Key created \REGISTRY\MACHINE\Software\CLASSES\ms-pu C:\Users\Admin\AppData\Local\Temp\AvastSvcZEg\AvastSvc.exe N/A
Key created \REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000_Classes\ms-pu C:\Users\Admin\AppData\Local\Temp\AvastSvcZEg\AvastSvc.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\ProgramData\AvastSvcZEg\AvastSvc.exe N/A
Token: SeDebugPrivilege N/A C:\ProgramData\AvastSvcZEg\AvastSvc.exe N/A
Token: SeTcbPrivilege N/A C:\ProgramData\AvastSvcZEg\AvastSvc.exe N/A

Processes

C:\Windows\system32\cmd.exe

cmd /c C:\Users\Admin\AppData\Local\Temp\AvastSvcZEg\AvastSvc.exe

C:\Users\Admin\AppData\Local\Temp\AvastSvcZEg\AvastSvc.exe

C:\Users\Admin\AppData\Local\Temp\AvastSvcZEg\AvastSvc.exe

C:\ProgramData\AvastSvcZEg\AvastSvc.exe

C:\ProgramData\AvastSvcZEg\AvastSvc.exe 303

Network

Country Destination Domain Proto
AU 103.56.53.46:80 tcp
US 8.8.8.8:53 20.160.190.20.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 43.58.199.20.in-addr.arpa udp
AU 103.56.53.46:110 tcp
US 8.8.8.8:53 53.210.109.20.in-addr.arpa udp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp

Files

memory/4680-1-0x0000000000A80000-0x0000000000B80000-memory.dmp

C:\ProgramData\AvastSvcZEg\AvastSvc.exe

MD5 a72036f635cecf0dcb1e9c6f49a8fa5b
SHA1 049813b955db1dd90952657ae2bd34250153563e
SHA256 85ca20eeec3400c68a62639a01928a5dab824d2eadf589e5cbfe5a2bc41d9654
SHA512 e3582e0969361d272c2469ce139ec809b9b0ac98fbc5eb5bb287442aed4c6ba69ed8175b68970751c93730cfaf07b75c3bc5e4e24aeda8f984b24f33bb8e3da2

C:\ProgramData\AvastSvcZEg\wsc.dll

MD5 831252e7fa9bd6fa174715647ebce516
SHA1 bf8c5bf141f0db53000805f2629e6e031d137ceb
SHA256 6491c646397025bf02709f1bd3025f1622abdc89b550ac38ce6fac938353b954
SHA512 0be6e898dcb75b32358bb8c2214e7b9453034ecfbe71d092df75b186a28f97ae7d5737f010b9d9e781c6b4cf3da19ee4a7cf5002604d23c527c55a3f7a0dba04

memory/3456-14-0x0000000000FE0000-0x00000000010E0000-memory.dmp

C:\ProgramData\AvastSvcZEg\AvastAuth.dat

MD5 53830fe278811363f93e0906d8b5ce69
SHA1 b133578af848e10500cc8b943483ed71e86a713a
SHA256 8ec409c1537e3030405bc8f8353d2605d1e88f1b245554383682f3aa8b5100ec
SHA512 c87497b49d2924be200053495074e16d82fdc875ecdcd231e185479901020c176c2a478c52eea55a9908fe3605ed3d5b2037fa4c83248d4d2bfea45f9f03dc37

memory/4680-2-0x0000000000D70000-0x00000000049A7000-memory.dmp

memory/3456-13-0x00000000012A0000-0x0000000004ED7000-memory.dmp

memory/3456-15-0x00000000012A0000-0x0000000004ED7000-memory.dmp

memory/3456-16-0x00000000012A0000-0x0000000004ED7000-memory.dmp

memory/3456-17-0x0000000000FE0000-0x00000000010E0000-memory.dmp