asyncrat | 716b12fa63c467b57e24182ae3af25b738fc589f3f4f0aa5c516190f3eefbf00

Resubmissions

07-12-2024 15:27

241207-svzd1swncx 10

07-12-2024 14:25

241207-rrbm4szpdq 10

Analysis

max time kernel
146s
max time network
140s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20241023-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
07-12-2024 14:25

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General

Target

Client.exe
Size

48KB
MD5

77ca225fb7c84aad1e8ee9ead0110b4c
SHA1

b26e40f8e945f4db6621d7ca5a575a84c0565f91
SHA256

716b12fa63c467b57e24182ae3af25b738fc589f3f4f0aa5c516190f3eefbf00
SHA512

e8f2138cd82714ba58a30d9b48c7e61a6c42b17db297c332e078db544575404382ccf16dbd5bd0aced9342186b05b65a1da0426062b10729a40123a5887e3bbb
SSDEEP

768:ywpRILv+sx+LiEtelDSN+iV08YbygeYslsoo7RSYFr0bvEgK/JfZVc6KN:ywcpEtKDs4zb10rqjF4nkJfZVclN

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Version

1.0.7

Botnet

Default

127.0.0.1:8848

127.0.0.1:59953

fojeweb571-59953.portmap.host:8848

fojeweb571-59953.portmap.host:59953

Mutex

DcRatMutex_qwqdanchun

Attributes

delay
1
install
true
install_file
windows defender firewall required.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
behavioral2/files/0x002900000004509e-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-1-5-21-1669812756-2240353048-2660728061-1000\Control Panel\International\Geo\Nation	Client.exe

Executes dropped EXE 1 IoCs

pid	Process
3832	windows defender firewall required.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

evasion

pid	Process
2624	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
5016	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
4680	Client.exe
4680	Client.exe
4680	Client.exe
4680	Client.exe
4680	Client.exe
4680	Client.exe
4680	Client.exe
4680	Client.exe
4680	Client.exe
4680	Client.exe
4680	Client.exe
4680	Client.exe
4680	Client.exe
4680	Client.exe
4680	Client.exe
4680	Client.exe
4680	Client.exe
4680	Client.exe
4680	Client.exe
4680	Client.exe
4680	Client.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4680	Client.exe
Token: SeDebugPrivilege	3832	windows defender firewall required.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4680 wrote to memory of 2444	4680	Client.exe	80
PID 4680 wrote to memory of 2444	4680	Client.exe	80
PID 4680 wrote to memory of 2012	4680	Client.exe	82
PID 4680 wrote to memory of 2012	4680	Client.exe	82
PID 2444 wrote to memory of 5016	2444	cmd.exe	84
PID 2444 wrote to memory of 5016	2444	cmd.exe	84
PID 2012 wrote to memory of 2624	2012	cmd.exe	85
PID 2012 wrote to memory of 2624	2012	cmd.exe	85
PID 2012 wrote to memory of 3832	2012	cmd.exe	90
PID 2012 wrote to memory of 3832	2012	cmd.exe	90

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\Client.exe
"C:\Users\Admin\AppData\Local\Temp\Client.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4680
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "windows defender firewall required" /tr '"C:\Users\Admin\AppData\Roaming\windows defender firewall required.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2444
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "windows defender firewall required" /tr '"C:\Users\Admin\AppData\Roaming\windows defender firewall required.exe"'
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:5016
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp919C.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2012
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2624
- - C:\Users\Admin\AppData\Roaming\windows defender firewall required.exe
    "C:\Users\Admin\AppData\Roaming\windows defender firewall required.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:3832

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\tmp919C.tmp.bat

Filesize
178B

MD5
4d4ed1f0592cb9a6670a91d9bcb61004

SHA1
bcff865f2aa7d17385dbf72d09c9f69ef4266315

SHA256
c8109b63db448df4a3d1a6a9ace70c7ff972aaeb36d2737a092a2892750ba4b9

SHA512
00a59b87d3b69702eb92450f69357344b5f3eaabd4833c5219d0c75359cacaf563e51441bd3e1b5763758c004e4d6aaa50f95b8d8335a49273efb7819669060f

Download Submit
C:\Users\Admin\AppData\Roaming\windows defender firewall required.exe

Filesize
48KB

MD5
77ca225fb7c84aad1e8ee9ead0110b4c

SHA1
b26e40f8e945f4db6621d7ca5a575a84c0565f91

SHA256
716b12fa63c467b57e24182ae3af25b738fc589f3f4f0aa5c516190f3eefbf00

SHA512
e8f2138cd82714ba58a30d9b48c7e61a6c42b17db297c332e078db544575404382ccf16dbd5bd0aced9342186b05b65a1da0426062b10729a40123a5887e3bbb

Download Submit
memory/4680-0-0x00007FFEE85D3000-0x00007FFEE85D5000-memory.dmp

Filesize
8KB

Download
memory/4680-1-0x00000000004E0000-0x00000000004F2000-memory.dmp

Filesize
72KB

Download
memory/4680-2-0x00007FFEE85D0000-0x00007FFEE9092000-memory.dmp

Filesize
10.8MB

Download
memory/4680-7-0x00007FFEE85D0000-0x00007FFEE9092000-memory.dmp

Filesize
10.8MB

Download