asyncrat | c89e2b54f3c5d87685524102f4a03430e99d41ff6541c99e97b379ab7f5a413c

Analysis

max time kernel
131s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20240419-en
resource tags

arch:x64arch:x86image:win10v2004-20240419-enlocale:en-usos:windows10-2004-x64system
submitted
04/05/2024, 10:33

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General

Target
Vulcan1.5 BETA/Vulcan1.5.exe
Size 78KB
Sample240504-mltvaaea64
SHA256 73daf4be0b78f20916eb75bdcf49c55445f24d6966ebb63e27fee354dc670d52
MD5 282462fa1cf7592d82b8bc63f8cca024
SHA1 f6d4d971d4bac357ae22a74f68a55b557d5ac69d
SHA512 b36cd8b0fef03994eb94376ccd09984d50b7e445955accfb6096c696e5219a036ba1e99c6a230045a83d3ae48a3e188b208f96c6395a7ed1567b52822bd806f8
SSDEEP 1536:1EDhxf8JYs1rRb64YUbah9IuuuNIEMdpqKmY7:iH8qeYUbaV1IEMGz
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Botnet

Default

127.0.0.1:3232
192.168.0.194:3232

Attributes

delay
4
install
true
install_file
sys1.exe
install_folder
%Temp%

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral12/files/0x0006000000022ab8-10.dat	family_asyncrat

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2860750803-256193626-1801997576-1000\Control Panel\International\Geo\Nation	Vulcan1.5.exe

Executes dropped EXE 1 IoCs

pid	Process
4436	sys1.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
648	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2040	timeout.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
872	Vulcan1.5.exe
872	Vulcan1.5.exe
872	Vulcan1.5.exe
872	Vulcan1.5.exe
872	Vulcan1.5.exe
872	Vulcan1.5.exe
872	Vulcan1.5.exe
872	Vulcan1.5.exe
872	Vulcan1.5.exe
872	Vulcan1.5.exe
872	Vulcan1.5.exe
872	Vulcan1.5.exe
872	Vulcan1.5.exe
872	Vulcan1.5.exe
872	Vulcan1.5.exe
872	Vulcan1.5.exe
872	Vulcan1.5.exe
872	Vulcan1.5.exe
872	Vulcan1.5.exe
872	Vulcan1.5.exe
872	Vulcan1.5.exe
872	Vulcan1.5.exe
872	Vulcan1.5.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	872	Vulcan1.5.exe
Token: SeDebugPrivilege	4436	sys1.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 872 wrote to memory of 3560	872	Vulcan1.5.exe	94
PID 872 wrote to memory of 3560	872	Vulcan1.5.exe	94
PID 872 wrote to memory of 4372	872	Vulcan1.5.exe	96
PID 872 wrote to memory of 4372	872	Vulcan1.5.exe	96
PID 4372 wrote to memory of 2040	4372	cmd.exe	98
PID 4372 wrote to memory of 2040	4372	cmd.exe	98
PID 3560 wrote to memory of 648	3560	cmd.exe	99
PID 3560 wrote to memory of 648	3560	cmd.exe	99
PID 4372 wrote to memory of 4436	4372	cmd.exe	101
PID 4372 wrote to memory of 4436	4372	cmd.exe	101

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\Vulcan1.5 BETA\Vulcan1.5.exe
"C:\Users\Admin\AppData\Local\Temp\Vulcan1.5 BETA\Vulcan1.5.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:872
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "sys1" /tr '"C:\Users\Admin\AppData\Local\Temp\sys1.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3560
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "sys1" /tr '"C:\Users\Admin\AppData\Local\Temp\sys1.exe"'
    3⤵
    - Creates scheduled task(s)
    PID:648
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp4621.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4372
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2040
- - C:\Users\Admin\AppData\Local\Temp\sys1.exe
    "C:\Users\Admin\AppData\Local\Temp\sys1.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:4436

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

sys1.exe

Path C:\Users\Admin\AppData\Local\Temp\sys1.exe
Size 78KB
SHA256 73daf4be0b78f20916eb75bdcf49c55445f24d6966ebb63e27fee354dc670d52
MD5 282462fa1cf7592d82b8bc63f8cca024
SHA1 f6d4d971d4bac357ae22a74f68a55b557d5ac69d
SHA512 b36cd8b0fef03994eb94376ccd09984d50b7e445955accfb6096c696e5219a036ba1e99c6a230045a83d3ae48a3e188b208f96c6395a7ed1567b52822bd806f8
SSDEEP 1536:1EDhxf8JYs1rRb64YUbah9IuuuNIEMdpqKmY7:iH8qeYUbaV1IEMGz
MD5 SHA1 SHA512 SSDEEP

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tmp4621.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp4621.tmp.bat
Size 151B
SHA256 4728856f07689e34eb4b9ef51d23ca334b581c55a12ffaac6ee1607e5c8869c0
MD5 5fa16ceaf7506db18f99015890bfaefa
SHA1 d6da6f30737f7f05fde2b001d6bf9318f2a91e9a
SHA512 f1184c214de348af1492a299047090e51c52c8365fba7d380c65bc8383754eeb5d6f34028223c76c461a34002835ea1ccefbeb63e777304f7568813165588b8d
MD5 SHA1 SHA512

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memory/872-1-0x0000000000490000-0x00000000004AA000-memory.dmp

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memory/872-0-0x00007FFF5DAB3000-0x00007FFF5DAB5000-memory.dmp

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memory/872-2-0x00007FFF5DAB0000-0x00007FFF5E571000-memory.dmp

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memory/872-7-0x00007FFF5DAB0000-0x00007FFF5E571000-memory.dmp

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