Malware Analysis Report

2024-09-22 07:44

Sample ID 240602-krabqahb73
Target b98132aea04a11317b8756786a12f51adbabe38e90d43fdfbc3095e1ad4c4e9a.exe
SHA256 b98132aea04a11317b8756786a12f51adbabe38e90d43fdfbc3095e1ad4c4e9a
Tags
asyncrat default persistence rat
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK Matrix

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

b98132aea04a11317b8756786a12f51adbabe38e90d43fdfbc3095e1ad4c4e9a

Threat Level: Known bad

The file b98132aea04a11317b8756786a12f51adbabe38e90d43fdfbc3095e1ad4c4e9a.exe was found to be: Known bad.

Malicious Activity Summary

asyncrat default persistence rat

AsyncRat

Adds Run key to start application

Suspicious use of SetThreadContext

Unsigned PE

Suspicious use of WriteProcessMemory

MITRE ATT&CK Matrix V13

Analysis: static1

Detonation Overview

Reported

2024-06-02 08:49

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-02 08:49

Reported

2024-06-02 08:52

Platform

win7-20240221-en

Max time kernel

145s

Max time network

149s

Command Line

"C:\Users\Admin\AppData\Local\Temp\b98132aea04a11317b8756786a12f51adbabe38e90d43fdfbc3095e1ad4c4e9a.exe"

Signatures

AsyncRat

rat asyncrat

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000\Software\Microsoft\Windows\CurrentVersion\Run\SmokerLtd = "C:\\Users\\Admin\\Documents\\Noments\\Toopan.exe" C:\Users\Admin\AppData\Local\Temp\b98132aea04a11317b8756786a12f51adbabe38e90d43fdfbc3095e1ad4c4e9a.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2876 set thread context of 2536 N/A C:\Users\Admin\AppData\Local\Temp\b98132aea04a11317b8756786a12f51adbabe38e90d43fdfbc3095e1ad4c4e9a.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe

Processes

C:\Users\Admin\AppData\Local\Temp\b98132aea04a11317b8756786a12f51adbabe38e90d43fdfbc3095e1ad4c4e9a.exe

"C:\Users\Admin\AppData\Local\Temp\b98132aea04a11317b8756786a12f51adbabe38e90d43fdfbc3095e1ad4c4e9a.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
SY 94.232.249.90:8848 tcp
SY 94.232.249.90:8848 tcp
SY 94.232.249.90:8848 tcp
SY 94.232.249.90:8848 tcp
SY 94.232.249.90:8848 tcp
SY 94.232.249.90:8848 tcp

Files

memory/2876-0-0x0000000000400000-0x00000000005CA000-memory.dmp

memory/2876-2-0x0000000000400000-0x00000000005CA000-memory.dmp

memory/2876-1-0x0000000000567000-0x0000000000572000-memory.dmp

memory/2536-4-0x00000000FFFDE000-0x00000000FFFDF000-memory.dmp

memory/2536-3-0x0000000000080000-0x0000000000092000-memory.dmp

memory/2536-5-0x0000000000080000-0x0000000000092000-memory.dmp

memory/2536-7-0x0000000000080000-0x0000000000092000-memory.dmp

memory/2876-10-0x0000000000400000-0x00000000005CA000-memory.dmp

memory/2536-9-0x0000000000080000-0x0000000000092000-memory.dmp

memory/2536-11-0x0000000074A4E000-0x0000000074A4F000-memory.dmp

memory/2536-12-0x0000000074A40000-0x000000007512E000-memory.dmp

memory/2536-13-0x0000000074A4E000-0x0000000074A4F000-memory.dmp

memory/2536-14-0x0000000074A40000-0x000000007512E000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-02 08:49

Reported

2024-06-02 08:52

Platform

win10v2004-20240508-en

Max time kernel

147s

Max time network

150s

Command Line

"C:\Users\Admin\AppData\Local\Temp\b98132aea04a11317b8756786a12f51adbabe38e90d43fdfbc3095e1ad4c4e9a.exe"

Signatures

AsyncRat

rat asyncrat

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-1337824034-2731376981-3755436523-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SmokerLtd = "C:\\Users\\Admin\\Documents\\Noments\\Toopan.exe" C:\Users\Admin\AppData\Local\Temp\b98132aea04a11317b8756786a12f51adbabe38e90d43fdfbc3095e1ad4c4e9a.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 3652 set thread context of 1760 N/A C:\Users\Admin\AppData\Local\Temp\b98132aea04a11317b8756786a12f51adbabe38e90d43fdfbc3095e1ad4c4e9a.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe

Processes

C:\Users\Admin\AppData\Local\Temp\b98132aea04a11317b8756786a12f51adbabe38e90d43fdfbc3095e1ad4c4e9a.exe

"C:\Users\Admin\AppData\Local\Temp\b98132aea04a11317b8756786a12f51adbabe38e90d43fdfbc3095e1ad4c4e9a.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 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 83.210.23.2.in-addr.arpa udp
US 8.8.8.8:53 133.32.126.40.in-addr.arpa udp
NL 23.62.61.194:443 www.bing.com tcp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 194.61.62.23.in-addr.arpa udp
US 8.8.8.8:53 196.249.167.52.in-addr.arpa udp
SY 94.232.249.90:8848 tcp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
SY 94.232.249.90:8848 tcp
US 8.8.8.8:53 25.24.18.2.in-addr.arpa udp
SY 94.232.249.90:8848 tcp
US 8.8.8.8:53 29.243.111.52.in-addr.arpa udp
SY 94.232.249.90:8848 tcp
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 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
SY 94.232.249.90:8848 tcp
SY 94.232.249.90:8848 tcp

Files

memory/3652-0-0x0000000000400000-0x00000000005CA000-memory.dmp

memory/3652-1-0x0000000000567000-0x0000000000572000-memory.dmp

memory/3652-3-0x0000000000400000-0x00000000005CA000-memory.dmp

memory/3652-2-0x0000000000400000-0x00000000005CA000-memory.dmp

memory/1760-4-0x0000000000BD0000-0x0000000000BE2000-memory.dmp

memory/3652-5-0x0000000000400000-0x00000000005CA000-memory.dmp

memory/1760-6-0x00000000739EE000-0x00000000739EF000-memory.dmp

memory/1760-7-0x00000000739E0000-0x0000000074190000-memory.dmp

memory/1760-8-0x00000000739EE000-0x00000000739EF000-memory.dmp

memory/1760-9-0x00000000739E0000-0x0000000074190000-memory.dmp