Malware Analysis Report

2025-01-02 12:15

Sample ID 240416-1l8v4afa2w
Target assssss.exe
SHA256 cef1b063659f6f90cb4a3d0dc14295919ea7c11020918d9c3a01a7705dd2e175
Tags
rat default asyncrat discovery
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

cef1b063659f6f90cb4a3d0dc14295919ea7c11020918d9c3a01a7705dd2e175

Threat Level: Known bad

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

Malicious Activity Summary

rat default asyncrat discovery

AsyncRat

Asyncrat family

Async RAT payload

Async RAT payload

Executes dropped EXE

Checks computer location settings

Checks installed software on the system

Enumerates physical storage devices

Unsigned PE

Suspicious behavior: EnumeratesProcesses

Suspicious use of SetWindowsHookEx

Delays execution with timeout.exe

Creates scheduled task(s)

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

Uses Task Scheduler COM API

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-04-16 21:45

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 21:45

Reported

2024-04-16 21:48

Platform

win7-20240215-en

Max time kernel

149s

Max time network

149s

Command Line

"C:\Users\Admin\AppData\Local\Temp\assssss.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\Local\Temp\Windows Host.exe N/A

Checks installed software on the system

discovery

Enumerates physical storage devices

Creates scheduled task(s)

persistence
Description Indicator Process Target
N/A N/A C:\Windows\system32\schtasks.exe N/A

Delays execution with timeout.exe

evasion
Description Indicator Process Target
N/A N/A C:\Windows\system32\timeout.exe N/A

Suspicious behavior: EnumeratesProcesses

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

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\assssss.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Windows Host.exe N/A

Suspicious use of SetWindowsHookEx

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2916 wrote to memory of 2004 N/A C:\Users\Admin\AppData\Local\Temp\assssss.exe C:\Windows\System32\cmd.exe
PID 2916 wrote to memory of 2004 N/A C:\Users\Admin\AppData\Local\Temp\assssss.exe C:\Windows\System32\cmd.exe
PID 2916 wrote to memory of 2004 N/A C:\Users\Admin\AppData\Local\Temp\assssss.exe C:\Windows\System32\cmd.exe
PID 2916 wrote to memory of 2512 N/A C:\Users\Admin\AppData\Local\Temp\assssss.exe C:\Windows\system32\cmd.exe
PID 2916 wrote to memory of 2512 N/A C:\Users\Admin\AppData\Local\Temp\assssss.exe C:\Windows\system32\cmd.exe
PID 2916 wrote to memory of 2512 N/A C:\Users\Admin\AppData\Local\Temp\assssss.exe C:\Windows\system32\cmd.exe
PID 2004 wrote to memory of 2632 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\schtasks.exe
PID 2004 wrote to memory of 2632 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\schtasks.exe
PID 2004 wrote to memory of 2632 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\schtasks.exe
PID 2512 wrote to memory of 2660 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\timeout.exe
PID 2512 wrote to memory of 2660 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\timeout.exe
PID 2512 wrote to memory of 2660 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\timeout.exe
PID 2512 wrote to memory of 2872 N/A C:\Windows\system32\cmd.exe C:\Users\Admin\AppData\Local\Temp\Windows Host.exe
PID 2512 wrote to memory of 2872 N/A C:\Windows\system32\cmd.exe C:\Users\Admin\AppData\Local\Temp\Windows Host.exe
PID 2512 wrote to memory of 2872 N/A C:\Windows\system32\cmd.exe C:\Users\Admin\AppData\Local\Temp\Windows Host.exe

Uses Task Scheduler COM API

persistence

Processes

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

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

C:\Windows\System32\cmd.exe

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

C:\Windows\system32\cmd.exe

cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp1E2B.tmp.bat""

C:\Windows\system32\schtasks.exe

schtasks /create /f /sc onlogon /rl highest /tn "Windows Host" /tr '"C:\Users\Admin\AppData\Local\Temp\Windows Host.exe"'

C:\Windows\system32\timeout.exe

timeout 3

C:\Users\Admin\AppData\Local\Temp\Windows Host.exe

"C:\Users\Admin\AppData\Local\Temp\Windows Host.exe"

Network

Country Destination Domain Proto
US 66.66.146.74:9511 tcp
US 66.66.146.74:9511 tcp
US 66.66.146.74:9511 tcp
US 66.66.146.74:9511 tcp
US 66.66.146.74:9511 tcp
US 66.66.146.74:9511 tcp
US 66.66.146.74:9511 tcp
US 66.66.146.74:9511 tcp
US 66.66.146.74:9511 tcp
US 66.66.146.74:9511 tcp
US 66.66.146.74:9511 tcp
US 66.66.146.74:9511 tcp
US 66.66.146.74:9511 tcp
US 66.66.146.74:9511 tcp
US 66.66.146.74:9511 tcp
US 66.66.146.74:9511 tcp
US 66.66.146.74:9511 tcp
US 66.66.146.74:9511 tcp
US 66.66.146.74:9511 tcp
US 66.66.146.74:9511 tcp
US 66.66.146.74:9511 tcp
US 66.66.146.74:9511 tcp
US 66.66.146.74:9511 tcp
US 66.66.146.74:9511 tcp
US 66.66.146.74:9511 tcp
US 66.66.146.74:9511 tcp
US 66.66.146.74:9511 tcp
US 66.66.146.74:9511 tcp
US 66.66.146.74:9511 tcp

Files

memory/2916-0-0x0000000000D20000-0x0000000000D38000-memory.dmp

memory/2916-2-0x000007FEF5390000-0x000007FEF5D7C000-memory.dmp

memory/2916-3-0x000000001AD50000-0x000000001ADD0000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\tmp1E2B.tmp.bat

MD5 ea0b531ff1c470078c42fbeba83602f1
SHA1 146342009c49a09bcfef925679b5eccfba176dad
SHA256 e9dfb67091f0709e019a865c7a6466620e527c3a6269e79b140e77d63f81ca1a
SHA512 0758e8eb8e2dabbd853a6e5ada17633d6b79a9d5a00a8b1051047aa53e252be537dd98809cd4c0bf26087ced7f71c81d0e9cfdd74bb2c29e553ed0851a36fb64

memory/2916-4-0x0000000077060000-0x0000000077209000-memory.dmp

memory/2916-15-0x0000000077060000-0x0000000077209000-memory.dmp

memory/2916-14-0x000007FEF5390000-0x000007FEF5D7C000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\Windows Host.exe

MD5 00633c71d9fa6e703dacc8c6266b2613
SHA1 c673396470a64a46c5c96643aa7558a35722faf2
SHA256 cef1b063659f6f90cb4a3d0dc14295919ea7c11020918d9c3a01a7705dd2e175
SHA512 840a93b7d5e992176f672618b8f4f23f0e697093656914525229555970dd91c19ceec1996d6d00d5ca372b029e944164d73d36d19994ad5c435618b6efa8f0cf

memory/2872-19-0x00000000000C0000-0x00000000000D8000-memory.dmp

C:\Users\Admin\AppData\Roaming\MyData\DataLogs.conf

MD5 cf759e4c5f14fe3eec41b87ed756cea8
SHA1 c27c796bb3c2fac929359563676f4ba1ffada1f5
SHA256 c9f9f193409217f73cc976ad078c6f8bf65d3aabcf5fad3e5a47536d47aa6761
SHA512 c7f832aee13a5eb36d145f35d4464374a9e12fa2017f3c2257442d67483b35a55eccae7f7729243350125b37033e075efbc2303839fd86b81b9b4dca3626953b

memory/2872-20-0x000007FEF49A0000-0x000007FEF538C000-memory.dmp

memory/2872-22-0x0000000000690000-0x0000000000710000-memory.dmp

memory/2872-23-0x0000000077060000-0x0000000077209000-memory.dmp

memory/2872-41-0x000007FEF49A0000-0x000007FEF538C000-memory.dmp

C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015

MD5 29f65ba8e88c063813cc50a4ea544e93
SHA1 05a7040d5c127e68c25d81cc51271ffb8bef3568
SHA256 1ed81fa8dfb6999a9fedc6e779138ffd99568992e22d300acd181a6d2c8de184
SHA512 e29b2e92c496245bed3372578074407e8ef8882906ce10c35b3c8deebfefe01b5fd7f3030acaa693e175f4b7aca6cd7d8d10ae1c731b09c5fa19035e005de3aa

C:\Users\Admin\AppData\Local\Temp\Tar799A.tmp

MD5 435a9ac180383f9fa094131b173a2f7b
SHA1 76944ea657a9db94f9a4bef38f88c46ed4166983
SHA256 67dc37ed50b8e63272b49a254a6039ee225974f1d767bb83eb1fd80e759a7c34
SHA512 1a6b277611959720a9c71114957620517ad94541302f164eb872bd322292a952409bafb8bc2ac793b16ad5f25d83f8594ccff2b7834e3c2b2b941e6fc84c009a

memory/2872-62-0x0000000000690000-0x0000000000710000-memory.dmp

memory/2872-73-0x0000000077060000-0x0000000077209000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-04-16 21:45

Reported

2024-04-16 21:48

Platform

win10v2004-20240412-en

Max time kernel

91s

Max time network

145s

Command Line

"C:\Users\Admin\AppData\Local\Temp\assssss.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-1-5-21-259785868-298165991-4178590326-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\assssss.exe N/A

Executes dropped EXE

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

Checks installed software on the system

discovery

Enumerates physical storage devices

Creates scheduled task(s)

persistence
Description Indicator Process Target
N/A N/A C:\Windows\system32\schtasks.exe N/A

Delays execution with timeout.exe

evasion
Description Indicator Process Target
N/A N/A C:\Windows\system32\timeout.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\assssss.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Windows Host.exe N/A

Suspicious use of SetWindowsHookEx

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

Uses Task Scheduler COM API

persistence

Processes

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

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

C:\Windows\System32\cmd.exe

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

C:\Windows\system32\cmd.exe

C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp97EA.tmp.bat""

C:\Windows\system32\timeout.exe

timeout 3

C:\Windows\system32\schtasks.exe

schtasks /create /f /sc onlogon /rl highest /tn "Windows Host" /tr '"C:\Users\Admin\AppData\Local\Temp\Windows Host.exe"'

C:\Users\Admin\AppData\Local\Temp\Windows Host.exe

"C:\Users\Admin\AppData\Local\Temp\Windows Host.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 68.159.190.20.in-addr.arpa udp
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 9.228.82.20.in-addr.arpa udp
US 8.8.8.8:53 237.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 240.197.17.2.in-addr.arpa udp
US 8.8.8.8:53 22.160.190.20.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 66.66.146.74:9511 tcp
US 8.8.8.8:53 74.146.66.66.in-addr.arpa udp
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
US 8.8.8.8:53 68.126.19.2.in-addr.arpa udp
US 8.8.8.8:53 249.197.17.2.in-addr.arpa udp
US 8.8.8.8:53 22.236.111.52.in-addr.arpa udp

Files

memory/3752-0-0x0000000000BF0000-0x0000000000C08000-memory.dmp

memory/3752-2-0x00007FFC37440000-0x00007FFC37F01000-memory.dmp

memory/3752-3-0x0000000001300000-0x0000000001310000-memory.dmp

memory/3752-9-0x00007FFC37440000-0x00007FFC37F01000-memory.dmp

memory/3752-8-0x00007FFC55290000-0x00007FFC55485000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\tmp97EA.tmp.bat

MD5 00c6c88d19ba8404bc58f6e70cba315d
SHA1 099977f554b15af32cd00952ddd84f51ac65cd6a
SHA256 0732ec475975b282633087e3d9c1bf4d5daf7bbdb967d41d659159ed9e7416cd
SHA512 a81b9196cd2fd615d144f5feb8b80bf778dd66a1778769f3fc017332f5a56bbe3acef5f10bb22f3a1a9aa520f91cbdcacbc1fa58e14636e81e0513cfc4961a6d

C:\Users\Admin\AppData\Local\Temp\Windows Host.exe

MD5 00633c71d9fa6e703dacc8c6266b2613
SHA1 c673396470a64a46c5c96643aa7558a35722faf2
SHA256 cef1b063659f6f90cb4a3d0dc14295919ea7c11020918d9c3a01a7705dd2e175
SHA512 840a93b7d5e992176f672618b8f4f23f0e697093656914525229555970dd91c19ceec1996d6d00d5ca372b029e944164d73d36d19994ad5c435618b6efa8f0cf

C:\Users\Admin\AppData\Roaming\MyData\DataLogs.conf

MD5 cf759e4c5f14fe3eec41b87ed756cea8
SHA1 c27c796bb3c2fac929359563676f4ba1ffada1f5
SHA256 c9f9f193409217f73cc976ad078c6f8bf65d3aabcf5fad3e5a47536d47aa6761
SHA512 c7f832aee13a5eb36d145f35d4464374a9e12fa2017f3c2257442d67483b35a55eccae7f7729243350125b37033e075efbc2303839fd86b81b9b4dca3626953b

memory/2744-15-0x00007FFC37440000-0x00007FFC37F01000-memory.dmp

memory/2744-16-0x000000001B700000-0x000000001B710000-memory.dmp

memory/2744-17-0x000000001B700000-0x000000001B710000-memory.dmp

memory/2744-18-0x00007FFC37440000-0x00007FFC37F01000-memory.dmp

memory/2744-19-0x000000001B700000-0x000000001B710000-memory.dmp

memory/2744-20-0x000000001B700000-0x000000001B710000-memory.dmp

memory/2744-21-0x000000001B700000-0x000000001B710000-memory.dmp