Malware Analysis Report

2024-09-22 07:15

Sample ID 240602-br9l5sef27
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

Detects executables attemping to enumerate video devices using WMI

Detects executables containing the string DcRatBy

Detects executables embedding bas64-encoded APIs, command lines, registry keys, etc.

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 01:23

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-02 01:23

Reported

2024-06-02 01:26

Platform

win7-20240508-en

Max time kernel

146s

Max time network

151s

Command Line

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

Signatures

AsyncRat

rat asyncrat

Detects executables attemping to enumerate video devices using WMI

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

Detects executables containing the string DcRatBy

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

Detects executables embedding bas64-encoded APIs, command lines, registry keys, etc.

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

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-3691908287-3775019229-3534252667-1000\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 2740 set thread context of 2052 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/2740-0-0x0000000000400000-0x00000000005CA000-memory.dmp

memory/2740-1-0x0000000000567000-0x0000000000572000-memory.dmp

memory/2740-2-0x0000000000400000-0x00000000005CA000-memory.dmp

memory/2052-4-0x00000000FFFDE000-0x00000000FFFDF000-memory.dmp

memory/2052-3-0x0000000000080000-0x0000000000092000-memory.dmp

memory/2052-5-0x0000000000080000-0x0000000000092000-memory.dmp

memory/2052-7-0x0000000000080000-0x0000000000092000-memory.dmp

memory/2052-9-0x0000000000080000-0x0000000000092000-memory.dmp

memory/2740-10-0x0000000000400000-0x00000000005CA000-memory.dmp

memory/2052-11-0x00000000747CE000-0x00000000747CF000-memory.dmp

memory/2052-12-0x00000000747C0000-0x0000000074EAE000-memory.dmp

memory/2052-13-0x00000000747C0000-0x0000000074EAE000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-02 01:23

Reported

2024-06-02 01:26

Platform

win10v2004-20240508-en

Max time kernel

148s

Max time network

154s

Command Line

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

Signatures

AsyncRat

rat asyncrat

Detects executables attemping to enumerate video devices using WMI

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

Detects executables containing the string DcRatBy

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

Detects executables embedding bas64-encoded APIs, command lines, registry keys, etc.

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

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-4124900551-4068476067-3491212533-1000\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 2788 set thread context of 2176 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 58.55.71.13.in-addr.arpa udp
US 8.8.8.8:53 71.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 55.36.223.20.in-addr.arpa udp
US 8.8.8.8:53 149.220.183.52.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 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
SY 94.232.249.90:8848 tcp
US 8.8.8.8:53 240.143.123.92.in-addr.arpa udp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
SY 94.232.249.90:8848 tcp
US 8.8.8.8:53 14.227.111.52.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 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 200.197.79.204.in-addr.arpa udp
SY 94.232.249.90:8848 tcp
SY 94.232.249.90:8848 tcp

Files

memory/2788-0-0x0000000000400000-0x00000000005CA000-memory.dmp

memory/2788-1-0x0000000000567000-0x0000000000572000-memory.dmp

memory/2788-3-0x0000000000400000-0x00000000005CA000-memory.dmp

memory/2788-2-0x0000000000400000-0x00000000005CA000-memory.dmp

memory/2176-4-0x0000000000FC0000-0x0000000000FD2000-memory.dmp

memory/2788-5-0x0000000000400000-0x00000000005CA000-memory.dmp

memory/2176-6-0x00000000003F0000-0x00000000005FF000-memory.dmp