asyncrat | 716b12fa63c467b57e24182ae3af25b738fc589f3f4f0aa5c516190f3eefbf00

Resubmissions

07-12-2024 15:27

241207-svzd1swncx 10

07-12-2024 14:25

241207-rrbm4szpdq 10

Analysis

max time kernel
8s
max time network
9s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
07-12-2024 15:27

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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/0x0008000000023c84-11.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-1-5-21-3227495264-2217614367-4027411560-1000\Control Panel\International\Geo\Nation	Client.exe

Executes dropped EXE 1 IoCs

pid	Process
4544	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
4860	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
3684	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
3948	Client.exe
3948	Client.exe
3948	Client.exe
3948	Client.exe
3948	Client.exe
3948	Client.exe
3948	Client.exe
3948	Client.exe
3948	Client.exe
3948	Client.exe
3948	Client.exe
3948	Client.exe
3948	Client.exe
3948	Client.exe
3948	Client.exe
3948	Client.exe
3948	Client.exe
3948	Client.exe
3948	Client.exe
3948	Client.exe
3948	Client.exe
3948	Client.exe
3948	Client.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3948	Client.exe
Token: SeDebugPrivilege	4544	windows defender firewall required.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 3948 wrote to memory of 1828	3948	Client.exe	82
PID 3948 wrote to memory of 1828	3948	Client.exe	82
PID 3948 wrote to memory of 4664	3948	Client.exe	84
PID 3948 wrote to memory of 4664	3948	Client.exe	84
PID 4664 wrote to memory of 4860	4664	cmd.exe	86
PID 4664 wrote to memory of 4860	4664	cmd.exe	86
PID 1828 wrote to memory of 3684	1828	cmd.exe	87
PID 1828 wrote to memory of 3684	1828	cmd.exe	87
PID 4664 wrote to memory of 4544	4664	cmd.exe	88
PID 4664 wrote to memory of 4544	4664	cmd.exe	88

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:3948
- 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:1828
- - 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:3684
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpADA5.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4664
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:4860
- - 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:4544

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\tmpADA5.tmp.bat

Filesize
178B

MD5
dfabde143bb39cf33f0ff9a82d3b5eb5

SHA1
979d4ffb3b4b676e61d6d9e23b8b62efd450618d

SHA256
c49b1fd2f59b5c8a5b203e6a39c47fa69b8be2f455f9a71e34dc53b47fb262a5

SHA512
a7f5c8d227fe4b7b5c038c14474bea337cf5a7bdabb5ffe5528a3f6c5b86976195ce8d3e5c3d437597ade5d401a7364cdb1b09f36d545b0940a61794c5c148ff

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/3948-0-0x00007FFEBCFA3000-0x00007FFEBCFA5000-memory.dmp

Filesize
8KB

Download
memory/3948-1-0x00000000004C0000-0x00000000004D2000-memory.dmp

Filesize
72KB

Download
memory/3948-2-0x00007FFEBCFA0000-0x00007FFEBDA61000-memory.dmp

Filesize
10.8MB

Download
memory/3948-7-0x00007FFEBCFA0000-0x00007FFEBDA61000-memory.dmp

Filesize
10.8MB

Download