Malware Analysis Report

2024-10-23 19:26

Sample ID 240525-bllywshf28
Target 4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe
SHA256 4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76
Tags
asyncrat os rat
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

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

4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76

Threat Level: Known bad

The file 4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe was found to be: Known bad.

Malicious Activity Summary

asyncrat os rat

AsyncRat

Detects file containing reversed ASEP Autorun registry keys

Suspicious use of SetThreadContext

Unsigned PE

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK

N/A

Analysis: static1

Detonation Overview

Reported

2024-05-25 01:13

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-05-25 01:13

Reported

2024-05-25 01:16

Platform

win7-20240221-en

Max time kernel

117s

Max time network

145s

Command Line

"C:\Users\Admin\AppData\Local\Temp\4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe"

Signatures

AsyncRat

rat asyncrat

Detects file containing reversed ASEP Autorun registry keys

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

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 1968 set thread context of 2292 N/A C:\Users\Admin\AppData\Local\Temp\4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe

Suspicious use of AdjustPrivilegeToken

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1968 wrote to memory of 2292 N/A C:\Users\Admin\AppData\Local\Temp\4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 1968 wrote to memory of 2292 N/A C:\Users\Admin\AppData\Local\Temp\4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 1968 wrote to memory of 2292 N/A C:\Users\Admin\AppData\Local\Temp\4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 1968 wrote to memory of 2292 N/A C:\Users\Admin\AppData\Local\Temp\4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 1968 wrote to memory of 2292 N/A C:\Users\Admin\AppData\Local\Temp\4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 1968 wrote to memory of 2292 N/A C:\Users\Admin\AppData\Local\Temp\4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 1968 wrote to memory of 2292 N/A C:\Users\Admin\AppData\Local\Temp\4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 1968 wrote to memory of 2292 N/A C:\Users\Admin\AppData\Local\Temp\4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 1968 wrote to memory of 2292 N/A C:\Users\Admin\AppData\Local\Temp\4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 1968 wrote to memory of 2292 N/A C:\Users\Admin\AppData\Local\Temp\4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 1968 wrote to memory of 2292 N/A C:\Users\Admin\AppData\Local\Temp\4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 1968 wrote to memory of 2292 N/A C:\Users\Admin\AppData\Local\Temp\4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe

Processes

C:\Users\Admin\AppData\Local\Temp\4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe

"C:\Users\Admin\AppData\Local\Temp\4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe"

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

#system32

Network

Country Destination Domain Proto
GB 20.117.108.240:7825 tcp

Files

memory/1968-0-0x000000007464E000-0x000000007464F000-memory.dmp

memory/1968-1-0x00000000000F0000-0x000000000010C000-memory.dmp

memory/1968-2-0x0000000074640000-0x0000000074D2E000-memory.dmp

memory/2292-9-0x0000000000400000-0x0000000000412000-memory.dmp

memory/2292-13-0x0000000000400000-0x0000000000412000-memory.dmp

memory/2292-11-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

memory/2292-7-0x0000000000400000-0x0000000000412000-memory.dmp

memory/2292-5-0x0000000000400000-0x0000000000412000-memory.dmp

memory/2292-3-0x0000000000400000-0x0000000000412000-memory.dmp

memory/2292-17-0x0000000000400000-0x0000000000412000-memory.dmp

memory/2292-15-0x0000000000400000-0x0000000000412000-memory.dmp

memory/1968-18-0x0000000074640000-0x0000000074D2E000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-05-25 01:13

Reported

2024-05-25 01:16

Platform

win10v2004-20240508-en

Max time kernel

135s

Max time network

152s

Command Line

"C:\Users\Admin\AppData\Local\Temp\4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe"

Signatures

AsyncRat

rat asyncrat

Detects file containing reversed ASEP Autorun registry keys

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

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 4196 set thread context of 1556 N/A C:\Users\Admin\AppData\Local\Temp\4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe

Suspicious use of AdjustPrivilegeToken

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 4196 wrote to memory of 1556 N/A C:\Users\Admin\AppData\Local\Temp\4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 4196 wrote to memory of 1556 N/A C:\Users\Admin\AppData\Local\Temp\4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 4196 wrote to memory of 1556 N/A C:\Users\Admin\AppData\Local\Temp\4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 4196 wrote to memory of 1556 N/A C:\Users\Admin\AppData\Local\Temp\4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 4196 wrote to memory of 1556 N/A C:\Users\Admin\AppData\Local\Temp\4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 4196 wrote to memory of 1556 N/A C:\Users\Admin\AppData\Local\Temp\4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 4196 wrote to memory of 1556 N/A C:\Users\Admin\AppData\Local\Temp\4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 4196 wrote to memory of 1556 N/A C:\Users\Admin\AppData\Local\Temp\4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe

Processes

C:\Users\Admin\AppData\Local\Temp\4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe

"C:\Users\Admin\AppData\Local\Temp\4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76.exe"

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

#system32

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 --field-trial-handle=4028,i,13281073920029625837,8253721632651544158,262144 --variations-seed-version --mojo-platform-channel-handle=4492 /prefetch:8

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 217.106.137.52.in-addr.arpa udp
US 8.8.8.8:53 79.190.18.2.in-addr.arpa udp
US 8.8.8.8:53 17.160.190.20.in-addr.arpa udp
NL 23.62.61.97:443 www.bing.com tcp
US 8.8.8.8:53 97.61.62.23.in-addr.arpa udp
GB 20.117.108.240:7825 tcp
US 8.8.8.8:53 240.108.117.20.in-addr.arpa udp
US 8.8.8.8:53 104.219.191.52.in-addr.arpa udp
US 8.8.8.8:53 56.126.166.20.in-addr.arpa udp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 13.227.111.52.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 170.117.168.52.in-addr.arpa udp

Files

memory/4196-0-0x000000007507E000-0x000000007507F000-memory.dmp

memory/4196-1-0x0000000000620000-0x000000000063C000-memory.dmp

memory/1556-2-0x0000000000400000-0x0000000000412000-memory.dmp

memory/4196-4-0x0000000075070000-0x0000000075820000-memory.dmp

memory/1556-5-0x0000000075070000-0x0000000075820000-memory.dmp

memory/1556-6-0x0000000075070000-0x0000000075820000-memory.dmp

memory/1556-9-0x0000000005CF0000-0x0000000005D8C000-memory.dmp

memory/1556-10-0x0000000006340000-0x00000000068E4000-memory.dmp

memory/1556-11-0x0000000005E00000-0x0000000005E66000-memory.dmp

memory/4196-12-0x0000000075070000-0x0000000075820000-memory.dmp

memory/1556-13-0x0000000075070000-0x0000000075820000-memory.dmp

memory/1556-14-0x0000000075070000-0x0000000075820000-memory.dmp