Malware Analysis Report

2024-08-06 12:59

Sample ID 240604-pp7lnaga7s
Target f85e2a0cf2bf6c8f5c7657fbcd3fff12a72385d2b1382994f75853566812b0a3
SHA256 f85e2a0cf2bf6c8f5c7657fbcd3fff12a72385d2b1382994f75853566812b0a3
Tags
asyncrat envio 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

f85e2a0cf2bf6c8f5c7657fbcd3fff12a72385d2b1382994f75853566812b0a3

Threat Level: Known bad

The file f85e2a0cf2bf6c8f5c7657fbcd3fff12a72385d2b1382994f75853566812b0a3 was found to be: Known bad.

Malicious Activity Summary

asyncrat envio persistence rat

AsyncRat

Adds Run key to start application

Suspicious use of SetThreadContext

Unsigned PE

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK Matrix V13

Initial Access
TA0001
Execution
TA0002
Persistence
TA0003
Boot or Logon Autostart Execution
T1547
Registry Run Keys / Startup Folder
T1547.001
Privilege Escalation
TA0004
Boot or Logon Autostart Execution
T1547
Registry Run Keys / Startup Folder
T1547.001
Defense Evasion
TA0005
Modify Registry
T1112
Credential Access
TA0006
Discovery
TA0007
Lateral Movement
TA0008
Collection
TA0009
Exfiltration
TA0010
Command and Control
TA0011
Impact
TA0040
Resource Development
TA0042
Reconnaissance
TA0043

Analysis: static1

Detonation Overview

Reported

2024-06-04 12:31

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-04 12:31

Reported

2024-06-04 12:34

Platform

win7-20240221-en

Max time kernel

121s

Max time network

143s

Command Line

"C:\Users\Admin\AppData\Local\Temp\f85e2a0cf2bf6c8f5c7657fbcd3fff12a72385d2b1382994f75853566812b0a3.exe"

Signatures

AsyncRat

rat asyncrat

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-330940541-141609230-1670313778-1000\Software\Microsoft\Windows\CurrentVersion\Run\ters = "C:\\Users\\Admin\\Documents\\Tukansta\\butop5.exe" C:\Users\Admin\AppData\Local\Temp\f85e2a0cf2bf6c8f5c7657fbcd3fff12a72385d2b1382994f75853566812b0a3.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 1908 set thread context of 2540 N/A C:\Users\Admin\AppData\Local\Temp\f85e2a0cf2bf6c8f5c7657fbcd3fff12a72385d2b1382994f75853566812b0a3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe

Suspicious use of AdjustPrivilegeToken

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1908 wrote to memory of 2540 N/A C:\Users\Admin\AppData\Local\Temp\f85e2a0cf2bf6c8f5c7657fbcd3fff12a72385d2b1382994f75853566812b0a3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
PID 1908 wrote to memory of 2540 N/A C:\Users\Admin\AppData\Local\Temp\f85e2a0cf2bf6c8f5c7657fbcd3fff12a72385d2b1382994f75853566812b0a3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
PID 1908 wrote to memory of 2540 N/A C:\Users\Admin\AppData\Local\Temp\f85e2a0cf2bf6c8f5c7657fbcd3fff12a72385d2b1382994f75853566812b0a3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
PID 1908 wrote to memory of 2540 N/A C:\Users\Admin\AppData\Local\Temp\f85e2a0cf2bf6c8f5c7657fbcd3fff12a72385d2b1382994f75853566812b0a3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
PID 1908 wrote to memory of 2540 N/A C:\Users\Admin\AppData\Local\Temp\f85e2a0cf2bf6c8f5c7657fbcd3fff12a72385d2b1382994f75853566812b0a3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
PID 1908 wrote to memory of 2540 N/A C:\Users\Admin\AppData\Local\Temp\f85e2a0cf2bf6c8f5c7657fbcd3fff12a72385d2b1382994f75853566812b0a3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe

Processes

C:\Users\Admin\AppData\Local\Temp\f85e2a0cf2bf6c8f5c7657fbcd3fff12a72385d2b1382994f75853566812b0a3.exe

"C:\Users\Admin\AppData\Local\Temp\f85e2a0cf2bf6c8f5c7657fbcd3fff12a72385d2b1382994f75853566812b0a3.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 globalserverwindows.duckdns.org udp
NL 91.92.247.170:3030 globalserverwindows.duckdns.org tcp

Files

memory/1908-1-0x0000000000416000-0x0000000000430000-memory.dmp

memory/1908-0-0x0000000000400000-0x0000000000693000-memory.dmp

memory/1908-2-0x0000000000400000-0x0000000000693000-memory.dmp

memory/2540-4-0x00000000FFFDE000-0x00000000FFFDF000-memory.dmp

memory/2540-6-0x0000000000080000-0x0000000000092000-memory.dmp

memory/2540-3-0x0000000000080000-0x0000000000092000-memory.dmp

memory/2540-8-0x0000000000080000-0x0000000000092000-memory.dmp

memory/2540-10-0x0000000000080000-0x0000000000092000-memory.dmp

memory/1908-11-0x0000000000400000-0x0000000000693000-memory.dmp

memory/2540-12-0x000000007402E000-0x000000007402F000-memory.dmp

memory/2540-13-0x0000000074020000-0x000000007470E000-memory.dmp

memory/2540-31-0x000000007402E000-0x000000007402F000-memory.dmp

memory/2540-32-0x0000000074020000-0x000000007470E000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-04 12:31

Reported

2024-06-04 12:33

Platform

win10v2004-20240508-en

Max time kernel

135s

Max time network

144s

Command Line

"C:\Users\Admin\AppData\Local\Temp\f85e2a0cf2bf6c8f5c7657fbcd3fff12a72385d2b1382994f75853566812b0a3.exe"

Signatures

AsyncRat

rat asyncrat

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-4124900551-4068476067-3491212533-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ters = "C:\\Users\\Admin\\Documents\\Tukansta\\butop5.exe" C:\Users\Admin\AppData\Local\Temp\f85e2a0cf2bf6c8f5c7657fbcd3fff12a72385d2b1382994f75853566812b0a3.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 4480 set thread context of 4532 N/A C:\Users\Admin\AppData\Local\Temp\f85e2a0cf2bf6c8f5c7657fbcd3fff12a72385d2b1382994f75853566812b0a3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe

Suspicious use of AdjustPrivilegeToken

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 4480 wrote to memory of 4532 N/A C:\Users\Admin\AppData\Local\Temp\f85e2a0cf2bf6c8f5c7657fbcd3fff12a72385d2b1382994f75853566812b0a3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
PID 4480 wrote to memory of 4532 N/A C:\Users\Admin\AppData\Local\Temp\f85e2a0cf2bf6c8f5c7657fbcd3fff12a72385d2b1382994f75853566812b0a3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
PID 4480 wrote to memory of 4532 N/A C:\Users\Admin\AppData\Local\Temp\f85e2a0cf2bf6c8f5c7657fbcd3fff12a72385d2b1382994f75853566812b0a3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
PID 4480 wrote to memory of 4532 N/A C:\Users\Admin\AppData\Local\Temp\f85e2a0cf2bf6c8f5c7657fbcd3fff12a72385d2b1382994f75853566812b0a3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
PID 4480 wrote to memory of 4532 N/A C:\Users\Admin\AppData\Local\Temp\f85e2a0cf2bf6c8f5c7657fbcd3fff12a72385d2b1382994f75853566812b0a3.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe

Processes

C:\Users\Admin\AppData\Local\Temp\f85e2a0cf2bf6c8f5c7657fbcd3fff12a72385d2b1382994f75853566812b0a3.exe

"C:\Users\Admin\AppData\Local\Temp\f85e2a0cf2bf6c8f5c7657fbcd3fff12a72385d2b1382994f75853566812b0a3.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 8.8.8.8:53 154.239.44.20.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 74.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 97.17.167.52.in-addr.arpa udp
US 8.8.8.8:53 globalserverwindows.duckdns.org udp
US 8.8.8.8:53 globalserverwindows.duckdns.org udp
NL 91.92.247.170:3030 globalserverwindows.duckdns.org tcp
US 8.8.8.8:53 170.247.92.91.in-addr.arpa udp
US 8.8.8.8:53 26.165.165.52.in-addr.arpa udp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
US 8.8.8.8:53 11.227.111.52.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 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 8.8.8.8:53 205.47.74.20.in-addr.arpa udp

Files

memory/4480-0-0x0000000000400000-0x0000000000693000-memory.dmp

memory/4480-1-0x0000000000416000-0x0000000000430000-memory.dmp

memory/4480-2-0x0000000000400000-0x0000000000693000-memory.dmp

memory/4532-3-0x0000000000890000-0x00000000008A2000-memory.dmp

memory/4480-4-0x0000000000400000-0x0000000000693000-memory.dmp

memory/4532-5-0x000000007479E000-0x000000007479F000-memory.dmp

memory/4532-6-0x0000000074790000-0x0000000074F40000-memory.dmp

memory/4532-9-0x0000000005A70000-0x0000000005B0C000-memory.dmp

memory/4532-10-0x00000000060C0000-0x0000000006664000-memory.dmp

memory/4532-11-0x0000000005B10000-0x0000000005B76000-memory.dmp

memory/4532-12-0x0000000074790000-0x0000000074F40000-memory.dmp

memory/4532-13-0x000000007479E000-0x000000007479F000-memory.dmp

memory/4532-14-0x0000000074790000-0x0000000074F40000-memory.dmp

memory/4532-15-0x0000000074790000-0x0000000074F40000-memory.dmp