asyncrat | c89e2b54f3c5d87685524102f4a03430e99d41ff6541c99e97b379ab7f5a413c

Resubmissions

04/05/2024, 10:29

240504-mjf6eabb9110

04/05/2024, 09:56

240504-lysmbaae8y10

Analysis

max time kernel
148s
max time network
149s
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, 10:29

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General

Target
Vulcan1.5 BETA/Vulcan1.5.exe
Size 78KB
Sample240504-mjf6eabb91
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/0x0006000000022973-10.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-1-5-21-877519540-908060166-1852957295-1000\Control Panel\International\Geo\Nation	Vulcan1.5.exe

Executes dropped EXE 1 IoCs

pid	Process
4288	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
508	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3100	timeout.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
1908	Vulcan1.5.exe
1908	Vulcan1.5.exe
1908	Vulcan1.5.exe
1908	Vulcan1.5.exe
1908	Vulcan1.5.exe
1908	Vulcan1.5.exe
1908	Vulcan1.5.exe
1908	Vulcan1.5.exe
1908	Vulcan1.5.exe
1908	Vulcan1.5.exe
1908	Vulcan1.5.exe
1908	Vulcan1.5.exe
1908	Vulcan1.5.exe
1908	Vulcan1.5.exe
1908	Vulcan1.5.exe
1908	Vulcan1.5.exe
1908	Vulcan1.5.exe
1908	Vulcan1.5.exe
1908	Vulcan1.5.exe
1908	Vulcan1.5.exe
1908	Vulcan1.5.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1908	Vulcan1.5.exe
Token: SeDebugPrivilege	4288	sys1.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1908 wrote to memory of 2308	1908	Vulcan1.5.exe	93
PID 1908 wrote to memory of 2308	1908	Vulcan1.5.exe	93
PID 1908 wrote to memory of 2952	1908	Vulcan1.5.exe	95
PID 1908 wrote to memory of 2952	1908	Vulcan1.5.exe	95
PID 2308 wrote to memory of 508	2308	cmd.exe	97
PID 2308 wrote to memory of 508	2308	cmd.exe	97
PID 2952 wrote to memory of 3100	2952	cmd.exe	98
PID 2952 wrote to memory of 3100	2952	cmd.exe	98
PID 2952 wrote to memory of 4288	2952	cmd.exe	100
PID 2952 wrote to memory of 4288	2952	cmd.exe	100

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:1908
- 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:2308
- - 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:508
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp59E7.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2952
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:3100
- - 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:4288

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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tmp59E7.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp59E7.tmp.bat
Size 151B
SHA256 0c10e5949519e392d31c3188326bdf18db5b2741de51c45d3f18bb2d95edc198
MD5 cd08fd96f3323f827528acb0dafb8f0b
SHA1 12cfcdbfb27362a51b356607600cb5a12c393456
SHA512 e72959914ae00568d25839d7357726548657a573c4721a938e3f06ceee8f5b3b12bc403cab84dfcf2efe964284d162d4d7a303fc50a8caaa06db32285a24194f
MD5 SHA1 SHA512

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memory/1908-0-0x0000000000CF0000-0x0000000000D0A000-memory.dmp

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memory/1908-1-0x00007FFF35E13000-0x00007FFF35E15000-memory.dmp

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memory/1908-2-0x00007FFF35E10000-0x00007FFF368D1000-memory.dmp

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memory/1908-7-0x00007FFF35E10000-0x00007FFF368D1000-memory.dmp

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