Malware Analysis Report

2025-01-02 12:15

Sample ID 240416-1r3k9sdf36
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

Async RAT payload

Asyncrat family

AsyncRat

Async RAT payload

Checks computer location settings

Executes dropped EXE

Checks installed software on the system

Enumerates physical storage devices

Unsigned PE

Delays execution with timeout.exe

Suspicious use of SetWindowsHookEx

Suspicious behavior: EnumeratesProcesses

Suspicious use of WriteProcessMemory

Uses Task Scheduler COM API

Creates scheduled task(s)

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-04-16 21:53

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 21:53

Reported

2024-04-16 21:56

Platform

win7-20240221-en

Max time kernel

149s

Max time network

152s

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
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 2184 wrote to memory of 2464 N/A C:\Users\Admin\AppData\Local\Temp\assssss.exe C:\Windows\System32\cmd.exe
PID 2184 wrote to memory of 2464 N/A C:\Users\Admin\AppData\Local\Temp\assssss.exe C:\Windows\System32\cmd.exe
PID 2184 wrote to memory of 2464 N/A C:\Users\Admin\AppData\Local\Temp\assssss.exe C:\Windows\System32\cmd.exe
PID 2184 wrote to memory of 2588 N/A C:\Users\Admin\AppData\Local\Temp\assssss.exe C:\Windows\system32\cmd.exe
PID 2184 wrote to memory of 2588 N/A C:\Users\Admin\AppData\Local\Temp\assssss.exe C:\Windows\system32\cmd.exe
PID 2184 wrote to memory of 2588 N/A C:\Users\Admin\AppData\Local\Temp\assssss.exe C:\Windows\system32\cmd.exe
PID 2464 wrote to memory of 2496 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\schtasks.exe
PID 2464 wrote to memory of 2496 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\schtasks.exe
PID 2464 wrote to memory of 2496 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\schtasks.exe
PID 2588 wrote to memory of 2476 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\timeout.exe
PID 2588 wrote to memory of 2476 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\timeout.exe
PID 2588 wrote to memory of 2476 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\timeout.exe
PID 2588 wrote to memory of 2532 N/A C:\Windows\system32\cmd.exe C:\Users\Admin\AppData\Local\Temp\Windows Host.exe
PID 2588 wrote to memory of 2532 N/A C:\Windows\system32\cmd.exe C:\Users\Admin\AppData\Local\Temp\Windows Host.exe
PID 2588 wrote to memory of 2532 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\tmp3BE8.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
US 66.66.146.74:9511 tcp

Files

memory/2184-0-0x0000000000D20000-0x0000000000D38000-memory.dmp

memory/2184-1-0x000007FEF5690000-0x000007FEF607C000-memory.dmp

memory/2184-3-0x000000001AF00000-0x000000001AF80000-memory.dmp

memory/2184-4-0x0000000077020000-0x00000000771C9000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\tmp3BE8.tmp.bat

MD5 8067a44f9c897d86d34c8e607d82c0d8
SHA1 0584529a762f5ad6e2dd274aab75dd62e9ae8753
SHA256 eeed5f28012c30438585580bb6dc56461a8b1e2058894befc4be8551f6ebe9d8
SHA512 a52e65a6d2d972ea39c60d2b162b1fc8d058c049d21645ea3886c02221aa08b9d39cc4bc6c7fd6e4d7f0426a5ac463372c51fdc04ce846c384fdde0920bc0f73

memory/2184-14-0x000007FEF5690000-0x000007FEF607C000-memory.dmp

memory/2184-15-0x0000000077020000-0x00000000771C9000-memory.dmp

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/2532-19-0x0000000001000000-0x0000000001018000-memory.dmp

memory/2532-21-0x000007FEF4CA0000-0x000007FEF568C000-memory.dmp

memory/2532-22-0x0000000000E30000-0x0000000000EB0000-memory.dmp

memory/2532-23-0x0000000077020000-0x00000000771C9000-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\Tar680D.tmp

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

memory/2532-101-0x000007FEF4CA0000-0x000007FEF568C000-memory.dmp

memory/2532-122-0x0000000000E30000-0x0000000000EB0000-memory.dmp

memory/2532-123-0x0000000077020000-0x00000000771C9000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-04-16 21:53

Reported

2024-04-16 21:56

Platform

win10v2004-20240412-en

Max time kernel

92s

Max time network

147s

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-1-5-21-3198953144-1466794930-246379610-1000\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\tmp7772.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 8.8.8.8:53 140.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 9.228.82.20.in-addr.arpa udp
US 8.8.8.8:53 g.bing.com udp
US 204.79.197.237:443 g.bing.com tcp
NL 23.62.61.194:443 www.bing.com tcp
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 8.8.8.8:53 194.61.62.23.in-addr.arpa udp
US 8.8.8.8:53 43.58.199.20.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 26.165.165.52.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
US 8.8.8.8:53 249.197.17.2.in-addr.arpa udp
US 8.8.8.8:53 14.227.111.52.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp

Files

memory/3280-0-0x0000000000960000-0x0000000000978000-memory.dmp

memory/3280-1-0x00007FFCD1C30000-0x00007FFCD26F1000-memory.dmp

memory/3280-3-0x000000001B6D0000-0x000000001B6E0000-memory.dmp

memory/3280-8-0x00007FFCF0010000-0x00007FFCF0205000-memory.dmp

memory/3280-9-0x00007FFCD1C30000-0x00007FFCD26F1000-memory.dmp

memory/3280-10-0x00007FFCF0010000-0x00007FFCF0205000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\tmp7772.tmp.bat

MD5 f71ae9567260e80de0d74b8563eba396
SHA1 c82f906b4ef422c1f0554902e8e7361d5bcdc8c6
SHA256 0c3c009d16f91af265fed09f9a36c4c8087003fae69573809f8941eafc1c6977
SHA512 d5346ffb7d97f941a8b46ab7e3eae3ba8e0910bb27138209ae97e33174780fc49e63d386cba55dd7d0f9b23b172cce1ce081e78602ec04def037612af9f99a6e

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/4004-16-0x00007FFCD1C30000-0x00007FFCD26F1000-memory.dmp

memory/4004-17-0x000000001B530000-0x000000001B540000-memory.dmp

memory/4004-18-0x000000001B530000-0x000000001B540000-memory.dmp

memory/4004-19-0x000000001B530000-0x000000001B540000-memory.dmp

memory/4004-20-0x00007FFCD1C30000-0x00007FFCD26F1000-memory.dmp

memory/4004-21-0x000000001B530000-0x000000001B540000-memory.dmp

memory/4004-22-0x000000001B530000-0x000000001B540000-memory.dmp

memory/4004-23-0x000000001B530000-0x000000001B540000-memory.dmp