Malware Analysis Report

2025-04-13 12:35

Sample ID 240802-y82n7atfkc
Target 36edf4090f6e91fdc91a9bc3ec1f94c8cabad7ee22dface2651e1f01c1730ab8
SHA256 36edf4090f6e91fdc91a9bc3ec1f94c8cabad7ee22dface2651e1f01c1730ab8
Tags
asyncrat julio 31 discovery persistence rat
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: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

36edf4090f6e91fdc91a9bc3ec1f94c8cabad7ee22dface2651e1f01c1730ab8

Threat Level: Known bad

The file 36edf4090f6e91fdc91a9bc3ec1f94c8cabad7ee22dface2651e1f01c1730ab8 was found to be: Known bad.

Malicious Activity Summary

asyncrat julio 31 discovery persistence rat

AsyncRat

Adds Run key to start application

Suspicious use of SetThreadContext

System Location Discovery: System Language Discovery

Unsigned PE

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-08-02 20:28

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-08-02 20:28

Reported

2024-08-02 20:30

Platform

win7-20240705-en

Max time kernel

122s

Max time network

142s

Command Line

"C:\Users\Admin\AppData\Local\Temp\36edf4090f6e91fdc91a9bc3ec1f94c8cabad7ee22dface2651e1f01c1730ab8.exe"

Signatures

AsyncRat

rat asyncrat

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-1385883288-3042840365-2734249351-1000\Software\Microsoft\Windows\CurrentVersion\Run\ExpressVpnUpdater = "C:\\Users\\Admin\\Pictures\\Expressvpn\\ExpressVpn.exe" C:\Users\Admin\AppData\Local\Temp\36edf4090f6e91fdc91a9bc3ec1f94c8cabad7ee22dface2651e1f01c1730ab8.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2412 set thread context of 1028 N/A C:\Users\Admin\AppData\Local\Temp\36edf4090f6e91fdc91a9bc3ec1f94c8cabad7ee22dface2651e1f01c1730ab8.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe

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\36edf4090f6e91fdc91a9bc3ec1f94c8cabad7ee22dface2651e1f01c1730ab8.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\36edf4090f6e91fdc91a9bc3ec1f94c8cabad7ee22dface2651e1f01c1730ab8.exe

"C:\Users\Admin\AppData\Local\Temp\36edf4090f6e91fdc91a9bc3ec1f94c8cabad7ee22dface2651e1f01c1730ab8.exe"

C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe

"C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 estefmedina27.duckdns.org udp
SE 46.246.84.4:9090 estefmedina27.duckdns.org tcp

Files

memory/2412-0-0x0000000000400000-0x00000000007EA000-memory.dmp

memory/2412-1-0x0000000000410000-0x000000000042A000-memory.dmp

memory/2412-2-0x0000000000400000-0x00000000007EA000-memory.dmp

memory/2412-3-0x0000000000400000-0x00000000007EA000-memory.dmp

memory/1028-5-0x00000000FFFDE000-0x00000000FFFDF000-memory.dmp

memory/1028-4-0x0000000000080000-0x0000000000092000-memory.dmp

memory/1028-6-0x0000000000080000-0x0000000000092000-memory.dmp

memory/1028-10-0x0000000000080000-0x0000000000092000-memory.dmp

memory/1028-8-0x0000000000080000-0x0000000000092000-memory.dmp

memory/2412-11-0x0000000000400000-0x00000000007EA000-memory.dmp

memory/1028-12-0x000000007471E000-0x000000007471F000-memory.dmp

memory/1028-13-0x0000000074710000-0x0000000074DFE000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\Cab1CF5.tmp

MD5 49aebf8cbd62d92ac215b2923fb1b9f5
SHA1 1723be06719828dda65ad804298d0431f6aff976
SHA256 b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f
SHA512 bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

memory/1028-30-0x000000007471E000-0x000000007471F000-memory.dmp

memory/1028-31-0x0000000074710000-0x0000000074DFE000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-02 20:28

Reported

2024-08-02 20:30

Platform

win10v2004-20240802-en

Max time kernel

120s

Max time network

144s

Command Line

"C:\Users\Admin\AppData\Local\Temp\36edf4090f6e91fdc91a9bc3ec1f94c8cabad7ee22dface2651e1f01c1730ab8.exe"

Signatures

AsyncRat

rat asyncrat

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-2412658365-3084825385-3340777666-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ExpressVpnUpdater = "C:\\Users\\Admin\\Pictures\\Expressvpn\\ExpressVpn.exe" C:\Users\Admin\AppData\Local\Temp\36edf4090f6e91fdc91a9bc3ec1f94c8cabad7ee22dface2651e1f01c1730ab8.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 1812 set thread context of 4468 N/A C:\Users\Admin\AppData\Local\Temp\36edf4090f6e91fdc91a9bc3ec1f94c8cabad7ee22dface2651e1f01c1730ab8.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe

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\36edf4090f6e91fdc91a9bc3ec1f94c8cabad7ee22dface2651e1f01c1730ab8.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\36edf4090f6e91fdc91a9bc3ec1f94c8cabad7ee22dface2651e1f01c1730ab8.exe

"C:\Users\Admin\AppData\Local\Temp\36edf4090f6e91fdc91a9bc3ec1f94c8cabad7ee22dface2651e1f01c1730ab8.exe"

C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe

"C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 g.bing.com udp
US 204.79.197.237:443 g.bing.com tcp
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 237.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 23.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 43.58.199.20.in-addr.arpa udp
US 8.8.8.8:53 estefmedina27.duckdns.org udp
SE 46.246.84.4:9090 estefmedina27.duckdns.org tcp
US 8.8.8.8:53 4.84.246.46.in-addr.arpa udp
US 8.8.8.8:53 25.140.123.92.in-addr.arpa udp
US 8.8.8.8:53 48.229.111.52.in-addr.arpa udp

Files

memory/1812-0-0x0000000000400000-0x00000000007EA000-memory.dmp

memory/1812-1-0x0000000000410000-0x000000000042A000-memory.dmp

memory/1812-2-0x0000000000400000-0x00000000007EA000-memory.dmp

memory/1812-3-0x0000000000400000-0x00000000007EA000-memory.dmp

memory/4468-4-0x00000000006F0000-0x0000000000702000-memory.dmp

memory/1812-5-0x0000000000400000-0x00000000007EA000-memory.dmp

memory/4468-6-0x000000007425E000-0x000000007425F000-memory.dmp

memory/4468-7-0x0000000074250000-0x0000000074A00000-memory.dmp

memory/4468-8-0x0000000005820000-0x00000000058BC000-memory.dmp

memory/4468-9-0x0000000005E70000-0x0000000006414000-memory.dmp

memory/4468-10-0x0000000005930000-0x0000000005996000-memory.dmp

memory/4468-11-0x0000000074250000-0x0000000074A00000-memory.dmp

memory/4468-12-0x000000007425E000-0x000000007425F000-memory.dmp

memory/4468-13-0x0000000074250000-0x0000000074A00000-memory.dmp

memory/4468-14-0x0000000074250000-0x0000000074A00000-memory.dmp