Malware Analysis Report

2024-10-19 06:56

Sample ID 240628-nsw4naxejg
Target 76e8d35fe35dce2fb65d0e2fb1be067c.exe
SHA256 9c75c0e33bb81cadd1659deef9302106b7f2358cd8ea613e6e8b76f41e60ba8a
Tags
asyncrat default rat
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

9c75c0e33bb81cadd1659deef9302106b7f2358cd8ea613e6e8b76f41e60ba8a

Threat Level: Known bad

The file 76e8d35fe35dce2fb65d0e2fb1be067c.exe was found to be: Known bad.

Malicious Activity Summary

asyncrat default rat

AsyncRat

Asyncrat family

Async RAT payload

Async RAT payload

Checks computer location settings

Executes dropped EXE

Enumerates physical storage devices

Unsigned PE

Scheduled Task/Job: Scheduled Task

Suspicious behavior: EnumeratesProcesses

Suspicious use of WriteProcessMemory

Suspicious use of SetWindowsHookEx

Delays execution with timeout.exe

Suspicious use of AdjustPrivilegeToken

Uses Task Scheduler COM API

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-06-28 11:40

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: behavioral2

Detonation Overview

Submitted

2024-06-28 11:40

Reported

2024-06-28 11:42

Platform

win10v2004-20240508-en

Max time kernel

126s

Max time network

143s

Command Line

"C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.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-1-5-21-4124900551-4068476067-3491212533-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe N/A

Executes dropped EXE

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

Enumerates physical storage devices

Delays execution with timeout.exe

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

Scheduled Task/Job: Scheduled Task

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

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\task.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\task.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\task.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\task.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\task.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\task.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\task.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\task.exe N/A

Suspicious use of SetWindowsHookEx

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

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe

"C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe"

C:\Windows\System32\cmd.exe

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

C:\Windows\system32\cmd.exe

C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp499C.tmp.bat""

C:\Windows\system32\timeout.exe

timeout 3

C:\Windows\system32\schtasks.exe

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

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

"C:\Users\Admin\AppData\Roaming\task.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 28.118.140.52.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 4.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
NL 91.92.246.193:4444 tcp
NL 91.92.246.193:4444 tcp
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 95.12.20.2.in-addr.arpa udp
NL 91.92.246.193:4444 tcp
US 8.8.8.8:53 144.107.17.2.in-addr.arpa udp
NL 91.92.246.193:4444 tcp
US 8.8.8.8:53 30.243.111.52.in-addr.arpa udp
NL 91.92.246.193:4444 tcp
NL 91.92.246.193:4444 tcp

Files

memory/3596-0-0x00007FFF04093000-0x00007FFF04095000-memory.dmp

memory/3596-1-0x0000000000C80000-0x0000000000C98000-memory.dmp

memory/3596-3-0x00007FFF04090000-0x00007FFF04B51000-memory.dmp

memory/3596-9-0x00007FFF04090000-0x00007FFF04B51000-memory.dmp

memory/3596-8-0x00007FFF04090000-0x00007FFF04B51000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\tmp499C.tmp.bat

MD5 4bdbf3063ec394cd787f0c52c8e88fce
SHA1 d4ede05dc167b2c6fe70ccad4aab9c494266cd07
SHA256 44dcf2e4249b2216ab4fbd9715bf912f87c02f8ca9856bae2f06ca4f2531a4f8
SHA512 b6423d290f3a98bd61276ec0521716e264878f66e1dbbdf30f237acbd069bcb83451eaa57d17e83fa1c6b544850f29f34498db0231d53aab66eca44ec379f1f5

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

MD5 76e8d35fe35dce2fb65d0e2fb1be067c
SHA1 543ae7d1f3288b6439f50a7a6c50dacf02d13af4
SHA256 9c75c0e33bb81cadd1659deef9302106b7f2358cd8ea613e6e8b76f41e60ba8a
SHA512 d1a406fb8862577e0ba9ed1404b7568fcf519e8a39bc966e9ea58922bb2eb34bdd7275f9f3c6688b77d3604427a21973484d0b15a9cb4c992f61b17a2d775f02

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

MD5 cf759e4c5f14fe3eec41b87ed756cea8
SHA1 c27c796bb3c2fac929359563676f4ba1ffada1f5
SHA256 c9f9f193409217f73cc976ad078c6f8bf65d3aabcf5fad3e5a47536d47aa6761
SHA512 c7f832aee13a5eb36d145f35d4464374a9e12fa2017f3c2257442d67483b35a55eccae7f7729243350125b37033e075efbc2303839fd86b81b9b4dca3626953b

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-28 11:40

Reported

2024-06-28 11:42

Platform

win7-20240221-en

Max time kernel

127s

Max time network

139s

Command Line

"C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.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\task.exe N/A

Enumerates physical storage devices

Delays execution with timeout.exe

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

Scheduled Task/Job: Scheduled Task

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

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\task.exe N/A

Suspicious use of SetWindowsHookEx

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2976 wrote to memory of 1980 N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe C:\Windows\System32\cmd.exe
PID 2976 wrote to memory of 1980 N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe C:\Windows\System32\cmd.exe
PID 2976 wrote to memory of 1980 N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe C:\Windows\System32\cmd.exe
PID 2976 wrote to memory of 3020 N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe C:\Windows\system32\cmd.exe
PID 2976 wrote to memory of 3020 N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe C:\Windows\system32\cmd.exe
PID 2976 wrote to memory of 3020 N/A C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe C:\Windows\system32\cmd.exe
PID 1980 wrote to memory of 2724 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\schtasks.exe
PID 1980 wrote to memory of 2724 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\schtasks.exe
PID 1980 wrote to memory of 2724 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\schtasks.exe
PID 3020 wrote to memory of 2608 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\timeout.exe
PID 3020 wrote to memory of 2608 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\timeout.exe
PID 3020 wrote to memory of 2608 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\timeout.exe
PID 3020 wrote to memory of 2868 N/A C:\Windows\system32\cmd.exe C:\Users\Admin\AppData\Roaming\task.exe
PID 3020 wrote to memory of 2868 N/A C:\Windows\system32\cmd.exe C:\Users\Admin\AppData\Roaming\task.exe
PID 3020 wrote to memory of 2868 N/A C:\Windows\system32\cmd.exe C:\Users\Admin\AppData\Roaming\task.exe

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe

"C:\Users\Admin\AppData\Local\Temp\76e8d35fe35dce2fb65d0e2fb1be067c.exe"

C:\Windows\System32\cmd.exe

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

C:\Windows\system32\cmd.exe

cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp1555.tmp.bat""

C:\Windows\system32\schtasks.exe

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

C:\Windows\system32\timeout.exe

timeout 3

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

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

Network

Country Destination Domain Proto
NL 91.92.246.193:4444 tcp
NL 91.92.246.193:4444 tcp
NL 91.92.246.193:4444 tcp
NL 91.92.246.193:4444 tcp
NL 91.92.246.193:4444 tcp
NL 91.92.246.193:4444 tcp

Files

memory/2976-0-0x000007FEF5BD3000-0x000007FEF5BD4000-memory.dmp

memory/2976-1-0x0000000000AE0000-0x0000000000AF8000-memory.dmp

memory/2976-3-0x000007FEF5BD0000-0x000007FEF65BC000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\tmp1555.tmp.bat

MD5 24dbf479dec5fc54a06ef6e60dbcbd1d
SHA1 0ba4109fad7a0a413251d47a6b45a3ae46a462d1
SHA256 4565f6467a103ea0e76984fb90ca23dd170fdf8b556787f6062848eb20457165
SHA512 77a6f121fcfa19075720ac7c382027ddc733abe21507b267dd5519b6d609ac28f8d695afcce285d911147513b2a637d58c0a98015c3eec6f07a944d26e8c3a01

memory/2976-12-0x000007FEF5BD0000-0x000007FEF65BC000-memory.dmp

memory/2976-14-0x000007FEF5BD0000-0x000007FEF65BC000-memory.dmp

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

MD5 76e8d35fe35dce2fb65d0e2fb1be067c
SHA1 543ae7d1f3288b6439f50a7a6c50dacf02d13af4
SHA256 9c75c0e33bb81cadd1659deef9302106b7f2358cd8ea613e6e8b76f41e60ba8a
SHA512 d1a406fb8862577e0ba9ed1404b7568fcf519e8a39bc966e9ea58922bb2eb34bdd7275f9f3c6688b77d3604427a21973484d0b15a9cb4c992f61b17a2d775f02

memory/2868-18-0x00000000008A0000-0x00000000008B8000-memory.dmp

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

MD5 cf759e4c5f14fe3eec41b87ed756cea8
SHA1 c27c796bb3c2fac929359563676f4ba1ffada1f5
SHA256 c9f9f193409217f73cc976ad078c6f8bf65d3aabcf5fad3e5a47536d47aa6761
SHA512 c7f832aee13a5eb36d145f35d4464374a9e12fa2017f3c2257442d67483b35a55eccae7f7729243350125b37033e075efbc2303839fd86b81b9b4dca3626953b