asyncrat | 400c24bdb9b7dabfcd9a8a2f137550f338014d833d169c6e6f4252910fb95feb

Analysis

max time kernel
148s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20250314-en
resource tags

arch:x64arch:x86image:win10v2004-20250314-enlocale:en-usos:windows10-2004-x64system
submitted
22/03/2025, 06:15

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General

Target

a340d849cc988d5d06f7e30143d62c86.exe
Size

63KB
MD5

a340d849cc988d5d06f7e30143d62c86
SHA1

3bf172f21f8291c408e34ec8cedb2aa3db55861a
SHA256

0ec25e2bfb539e7fd9445ea617597e6e6d64f8c49c54f105091fc0763cc154b4
SHA512

96abc6657b576bddd6bc46d7344dc2d033cd120e8b7a569c7949f98251c7b688274f747a94f978d3d06130d9ae9fc3c72e88b265fb85be2093029d06580a2baa
SSDEEP

1536:lUFBzZBVrhJPkYUbjh9oM/JlXup4pqKmY7:l0VBV4YUbjE8JlMjz

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Botnet

Default

127.0.0.1:3230

Attributes

delay
1
install
true
install_file
Serial_checker.exe
install_folder
%AppData%

aes.plain

Signatures

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

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral20/files/0x000c00000002415d-12.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-1-5-21-3342763580-2723508992-2885672917-1000\Control Panel\International\Geo\Nation	a340d849cc988d5d06f7e30143d62c86.exe

Executes dropped EXE 1 IoCs

pid	Process
4836	Serial_checker.exe

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

System Information Discovery
T1082

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
1948	timeout.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
4616	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
1592	a340d849cc988d5d06f7e30143d62c86.exe
1592	a340d849cc988d5d06f7e30143d62c86.exe
1592	a340d849cc988d5d06f7e30143d62c86.exe
1592	a340d849cc988d5d06f7e30143d62c86.exe
1592	a340d849cc988d5d06f7e30143d62c86.exe
1592	a340d849cc988d5d06f7e30143d62c86.exe
1592	a340d849cc988d5d06f7e30143d62c86.exe
1592	a340d849cc988d5d06f7e30143d62c86.exe
1592	a340d849cc988d5d06f7e30143d62c86.exe
1592	a340d849cc988d5d06f7e30143d62c86.exe
1592	a340d849cc988d5d06f7e30143d62c86.exe
1592	a340d849cc988d5d06f7e30143d62c86.exe
1592	a340d849cc988d5d06f7e30143d62c86.exe
1592	a340d849cc988d5d06f7e30143d62c86.exe
1592	a340d849cc988d5d06f7e30143d62c86.exe
1592	a340d849cc988d5d06f7e30143d62c86.exe
1592	a340d849cc988d5d06f7e30143d62c86.exe
1592	a340d849cc988d5d06f7e30143d62c86.exe
1592	a340d849cc988d5d06f7e30143d62c86.exe
1592	a340d849cc988d5d06f7e30143d62c86.exe
1592	a340d849cc988d5d06f7e30143d62c86.exe
1592	a340d849cc988d5d06f7e30143d62c86.exe
1592	a340d849cc988d5d06f7e30143d62c86.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1592	a340d849cc988d5d06f7e30143d62c86.exe
Token: SeDebugPrivilege	4836	Serial_checker.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1592 wrote to memory of 4548	1592	a340d849cc988d5d06f7e30143d62c86.exe	88
PID 1592 wrote to memory of 4548	1592	a340d849cc988d5d06f7e30143d62c86.exe	88
PID 1592 wrote to memory of 4596	1592	a340d849cc988d5d06f7e30143d62c86.exe	90
PID 1592 wrote to memory of 4596	1592	a340d849cc988d5d06f7e30143d62c86.exe	90
PID 4548 wrote to memory of 4616	4548	cmd.exe	92
PID 4548 wrote to memory of 4616	4548	cmd.exe	92
PID 4596 wrote to memory of 1948	4596	cmd.exe	93
PID 4596 wrote to memory of 1948	4596	cmd.exe	93
PID 4596 wrote to memory of 4836	4596	cmd.exe	97
PID 4596 wrote to memory of 4836	4596	cmd.exe	97

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\a340d849cc988d5d06f7e30143d62c86.exe
"C:\Users\Admin\AppData\Local\Temp\a340d849cc988d5d06f7e30143d62c86.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1592
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Serial_checker" /tr '"C:\Users\Admin\AppData\Roaming\Serial_checker.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4548
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "Serial_checker" /tr '"C:\Users\Admin\AppData\Roaming\Serial_checker.exe"'
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4616
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp9E15.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4596
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:1948
- - C:\Users\Admin\AppData\Roaming\Serial_checker.exe
    "C:\Users\Admin\AppData\Roaming\Serial_checker.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:4836

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

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

C:\Users\Admin\AppData\Local\Temp\tmp9E15.tmp.bat

Filesize
158B

MD5
7a7ad0ae79d640eafffd5ba745d32a30

SHA1
2f9ca121530f0ca1e2669282004f7ddefd7be55a

SHA256
739ba12d78340a5a6f73e9905269618dc00b83e4a2f98aa442a1519211262e0e

SHA512
54d92a9553f0a697dc2e685f72acdff85b71a1ef089feff342f6141001d6c0875e6b54221c9efb91a65475666de89cbb83aa054df69f508361035deaf62c8d97

Download Submit
C:\Users\Admin\AppData\Roaming\Serial_checker.exe

Filesize
63KB

MD5
a340d849cc988d5d06f7e30143d62c86

SHA1
3bf172f21f8291c408e34ec8cedb2aa3db55861a

SHA256
0ec25e2bfb539e7fd9445ea617597e6e6d64f8c49c54f105091fc0763cc154b4

SHA512
96abc6657b576bddd6bc46d7344dc2d033cd120e8b7a569c7949f98251c7b688274f747a94f978d3d06130d9ae9fc3c72e88b265fb85be2093029d06580a2baa

Download Submit
memory/1592-1-0x00000000006E0000-0x00000000006F6000-memory.dmp

Filesize
88KB

Download
memory/1592-0-0x00007FFE597B3000-0x00007FFE597B5000-memory.dmp

Filesize
8KB

Download
memory/1592-2-0x00007FFE597B0000-0x00007FFE5A271000-memory.dmp

Filesize
10.8MB

Download
memory/1592-7-0x00007FFE597B0000-0x00007FFE5A271000-memory.dmp

Filesize
10.8MB

Download
memory/1592-8-0x00007FFE597B0000-0x00007FFE5A271000-memory.dmp

Filesize
10.8MB

Download
memory/1592-13-0x00007FFE597B0000-0x00007FFE5A271000-memory.dmp

Filesize
10.8MB

Download