Malware Analysis Report

2025-01-02 12:15

Sample ID 240416-25mmmsgf6v
Target AsyncClient.exe
SHA256 6a26dc7c12eddcdc36e00ca1633eb4f231a433deee4f574122c51690f28a3e67
Tags
rat default asyncrat
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

6a26dc7c12eddcdc36e00ca1633eb4f231a433deee4f574122c51690f28a3e67

Threat Level: Known bad

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

Malicious Activity Summary

rat default asyncrat

Async RAT payload

AsyncRat

Asyncrat family

Async RAT payload

Loads dropped DLL

Executes dropped EXE

Checks computer location settings

Enumerates physical storage devices

Unsigned PE

Delays execution with timeout.exe

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

Suspicious behavior: EnumeratesProcesses

Creates scheduled task(s)

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-04-16 23:09

Signatures

Async RAT payload

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

Asyncrat family

asyncrat

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-04-16 23:09

Reported

2024-04-16 23:12

Platform

win7-20240220-en

Max time kernel

125s

Max time network

134s

Command Line

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

Signatures

AsyncRat

rat asyncrat

Async RAT payload

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

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\Svchost.exe N/A

Loads dropped DLL

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\cmd.exe N/A

Enumerates physical storage devices

Creates scheduled task(s)

persistence
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\schtasks.exe N/A

Delays execution with timeout.exe

evasion
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\timeout.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\Svchost.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2276 wrote to memory of 1948 N/A C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe C:\Windows\SysWOW64\cmd.exe
PID 2276 wrote to memory of 1948 N/A C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe C:\Windows\SysWOW64\cmd.exe
PID 2276 wrote to memory of 1948 N/A C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe C:\Windows\SysWOW64\cmd.exe
PID 2276 wrote to memory of 1948 N/A C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe C:\Windows\SysWOW64\cmd.exe
PID 2276 wrote to memory of 2568 N/A C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe C:\Windows\SysWOW64\cmd.exe
PID 2276 wrote to memory of 2568 N/A C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe C:\Windows\SysWOW64\cmd.exe
PID 2276 wrote to memory of 2568 N/A C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe C:\Windows\SysWOW64\cmd.exe
PID 2276 wrote to memory of 2568 N/A C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe C:\Windows\SysWOW64\cmd.exe
PID 2568 wrote to memory of 2668 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 2568 wrote to memory of 2668 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 2568 wrote to memory of 2668 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 2568 wrote to memory of 2668 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 1948 wrote to memory of 2664 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\schtasks.exe
PID 1948 wrote to memory of 2664 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\schtasks.exe
PID 1948 wrote to memory of 2664 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\schtasks.exe
PID 1948 wrote to memory of 2664 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\schtasks.exe
PID 2568 wrote to memory of 2112 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\Svchost.exe
PID 2568 wrote to memory of 2112 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\Svchost.exe
PID 2568 wrote to memory of 2112 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\Svchost.exe
PID 2568 wrote to memory of 2112 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\Svchost.exe

Processes

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

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

C:\Windows\SysWOW64\cmd.exe

"C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Svchost" /tr '"C:\Users\Admin\AppData\Roaming\Svchost.exe"' & exit

C:\Windows\SysWOW64\cmd.exe

cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp191C.tmp.bat""

C:\Windows\SysWOW64\schtasks.exe

schtasks /create /f /sc onlogon /rl highest /tn "Svchost" /tr '"C:\Users\Admin\AppData\Roaming\Svchost.exe"'

C:\Windows\SysWOW64\timeout.exe

timeout 3

C:\Users\Admin\AppData\Roaming\Svchost.exe

"C:\Users\Admin\AppData\Roaming\Svchost.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 report-dust.gl.at.ply.gg udp
US 147.185.221.19:8188 report-dust.gl.at.ply.gg tcp
US 147.185.221.19:28329 report-dust.gl.at.ply.gg tcp
US 147.185.221.19:8188 report-dust.gl.at.ply.gg tcp
US 147.185.221.19:28329 report-dust.gl.at.ply.gg tcp
US 147.185.221.19:8188 report-dust.gl.at.ply.gg tcp
US 147.185.221.19:8188 report-dust.gl.at.ply.gg tcp

Files

memory/2276-0-0x0000000000270000-0x0000000000282000-memory.dmp

memory/2276-1-0x0000000073FB0000-0x000000007469E000-memory.dmp

memory/2276-2-0x0000000004E20000-0x0000000004E60000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\tmp191C.tmp.bat

MD5 81217d02b452480266f0f881d11baa57
SHA1 d252dd4e364eef934494d02e647d2bc80cc456b7
SHA256 ceaaea60f5b63a14b151c43461a18071bed8e486c01221d302a4b277531c72d2
SHA512 d02d23c44b7f96eb0db4d4573976567d17c489103980700c05f37050cf5c85d332089ef85e9ae5b268f100095cdfb9c27e3fca26388cbdcdd0d1f3c68f25641c

memory/2276-12-0x0000000073FB0000-0x000000007469E000-memory.dmp

\Users\Admin\AppData\Roaming\Svchost.exe

MD5 0712481ec7be68e2f67672b911aebf23
SHA1 527ceb23db13a4e84b5f27a850116bb1421981dd
SHA256 6a26dc7c12eddcdc36e00ca1633eb4f231a433deee4f574122c51690f28a3e67
SHA512 bce33d4a59624ccee236df8b3ff061bd58377dee284e44849471e7afdd9baf7845a91dc9701647ce9290ea13c3f18ca2bda780dce646a28b3c1436ad78d248cd

memory/2112-16-0x0000000000AE0000-0x0000000000AF2000-memory.dmp

memory/2112-17-0x0000000073F60000-0x000000007464E000-memory.dmp

memory/2112-18-0x00000000003A0000-0x00000000003E0000-memory.dmp

memory/2112-19-0x0000000073F60000-0x000000007464E000-memory.dmp

memory/2112-20-0x00000000003A0000-0x00000000003E0000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-04-16 23:09

Reported

2024-04-16 23:12

Platform

win10v2004-20240412-en

Max time kernel

147s

Max time network

152s

Command Line

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

Signatures

AsyncRat

rat asyncrat

Async RAT payload

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

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-776854024-226333264-2052258302-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\Svchost.exe N/A

Enumerates physical storage devices

Creates scheduled task(s)

persistence
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\schtasks.exe N/A

Delays execution with timeout.exe

evasion
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\timeout.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\Svchost.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3380 wrote to memory of 400 N/A C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe C:\Windows\SysWOW64\cmd.exe
PID 3380 wrote to memory of 400 N/A C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe C:\Windows\SysWOW64\cmd.exe
PID 3380 wrote to memory of 400 N/A C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe C:\Windows\SysWOW64\cmd.exe
PID 3380 wrote to memory of 4904 N/A C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe C:\Windows\SysWOW64\cmd.exe
PID 3380 wrote to memory of 4904 N/A C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe C:\Windows\SysWOW64\cmd.exe
PID 3380 wrote to memory of 4904 N/A C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe C:\Windows\SysWOW64\cmd.exe
PID 400 wrote to memory of 4708 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\schtasks.exe
PID 400 wrote to memory of 4708 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\schtasks.exe
PID 400 wrote to memory of 4708 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\schtasks.exe
PID 4904 wrote to memory of 2132 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 4904 wrote to memory of 2132 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 4904 wrote to memory of 2132 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 4904 wrote to memory of 4336 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\Svchost.exe
PID 4904 wrote to memory of 4336 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\Svchost.exe
PID 4904 wrote to memory of 4336 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\Svchost.exe

Processes

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

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

C:\Windows\SysWOW64\cmd.exe

"C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Svchost" /tr '"C:\Users\Admin\AppData\Roaming\Svchost.exe"' & exit

C:\Windows\SysWOW64\cmd.exe

C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp703E.tmp.bat""

C:\Windows\SysWOW64\schtasks.exe

schtasks /create /f /sc onlogon /rl highest /tn "Svchost" /tr '"C:\Users\Admin\AppData\Roaming\Svchost.exe"'

C:\Windows\SysWOW64\timeout.exe

timeout 3

C:\Users\Admin\AppData\Roaming\Svchost.exe

"C:\Users\Admin\AppData\Roaming\Svchost.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 75.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 241.154.82.20.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 237.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 21.114.53.23.in-addr.arpa udp
US 8.8.8.8:53 57.169.31.20.in-addr.arpa udp
US 8.8.8.8:53 report-dust.gl.at.ply.gg udp
US 147.185.221.19:28329 report-dust.gl.at.ply.gg tcp
US 8.8.8.8:53 19.221.185.147.in-addr.arpa udp
US 147.185.221.19:28329 report-dust.gl.at.ply.gg tcp
US 8.8.8.8:53 103.169.127.40.in-addr.arpa udp
US 8.8.8.8:53 56.126.166.20.in-addr.arpa udp
US 147.185.221.19:28329 report-dust.gl.at.ply.gg tcp
US 147.185.221.19:28329 report-dust.gl.at.ply.gg tcp
US 147.185.221.19:28329 report-dust.gl.at.ply.gg tcp
US 8.8.8.8:53 14.227.111.52.in-addr.arpa udp
US 147.185.221.19:8188 report-dust.gl.at.ply.gg tcp
US 147.185.221.19:28329 report-dust.gl.at.ply.gg tcp
US 147.185.221.19:8188 report-dust.gl.at.ply.gg tcp
US 8.8.8.8:53 3.173.189.20.in-addr.arpa udp

Files

memory/3380-1-0x0000000074610000-0x0000000074DC0000-memory.dmp

memory/3380-0-0x0000000000360000-0x0000000000372000-memory.dmp

memory/3380-2-0x0000000004D70000-0x0000000004D80000-memory.dmp

memory/3380-3-0x0000000004E80000-0x0000000004F1C000-memory.dmp

memory/3380-8-0x0000000074610000-0x0000000074DC0000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\tmp703E.tmp.bat

MD5 1c6805d42cc4d4a280f742529cee9291
SHA1 07a7e626cf87a9431d390f108d2a533c26c08354
SHA256 b8d0e9548593ed257b42c15c21831df5f4c5708ba50cdf8c0d6bc54f0a163543
SHA512 1818b72086861a750f542885af84641c358cba49ea7c3f8a4d17ae857ed3f02599b4a0afbc9714b0400989a88c65bb5f178a3af844d59253da114ecb40af927a

C:\Users\Admin\AppData\Roaming\Svchost.exe

MD5 0712481ec7be68e2f67672b911aebf23
SHA1 527ceb23db13a4e84b5f27a850116bb1421981dd
SHA256 6a26dc7c12eddcdc36e00ca1633eb4f231a433deee4f574122c51690f28a3e67
SHA512 bce33d4a59624ccee236df8b3ff061bd58377dee284e44849471e7afdd9baf7845a91dc9701647ce9290ea13c3f18ca2bda780dce646a28b3c1436ad78d248cd

memory/4336-13-0x0000000074560000-0x0000000074D10000-memory.dmp

memory/4336-14-0x0000000074560000-0x0000000074D10000-memory.dmp