asyncrat | 884eacb6f51be1e6eba1296aece06baccd3f600f258494fef2dfcc34fd257ccd

General

Target

Client.exe
Size

63KB
MD5

4ae421ab5dc26aad7211a5bcc6ae89f2
SHA1

90f1c09a58087d15688db7bf63ae889d8b453751
SHA256

884eacb6f51be1e6eba1296aece06baccd3f600f258494fef2dfcc34fd257ccd
SHA512

0b9689d6718749b03a38d3f681cb62f70eb96438a24ad0ca0177ffa53c70bebe8bc3e28ef46df5165baaf11a876df3fe27f5ece785f748ac2b467d79a51eb1c2
SSDEEP

768:a2C46poI3iPgqUi79JKWcXveeObMbNCl1+6SCv7mqb2nIpwH1oV7Go8GdZVc6KN:aEIo5neeiMl8GbbXwZGdZVclN

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Version

1.0.7

Botnet

Default

C2

127.0.0.1:8848

127.0.0.1:54817

Mutex

roaroaroaraoroaroaraoraoraoarororrohrorororoaroaaoaoaoaroaroar

Attributes

delay
1
install
true
install_file
windows defender firewall.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/0x0009000000023c5c-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-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	Client.exe

Executes dropped EXE 1 IoCs

pid	Process
3640	windows defender firewall.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
4520	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
4016	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
528	Client.exe
528	Client.exe
528	Client.exe
528	Client.exe
528	Client.exe
528	Client.exe
528	Client.exe
528	Client.exe
528	Client.exe
528	Client.exe
528	Client.exe
528	Client.exe
528	Client.exe
528	Client.exe
528	Client.exe
528	Client.exe
528	Client.exe
528	Client.exe
528	Client.exe
528	Client.exe
528	Client.exe
528	Client.exe
528	Client.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	528	Client.exe
Token: SeDebugPrivilege	3640	windows defender firewall.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 528 wrote to memory of 4876	528	Client.exe	82
PID 528 wrote to memory of 4876	528	Client.exe	82
PID 528 wrote to memory of 3920	528	Client.exe	84
PID 528 wrote to memory of 3920	528	Client.exe	84
PID 4876 wrote to memory of 4016	4876	cmd.exe	86
PID 4876 wrote to memory of 4016	4876	cmd.exe	86
PID 3920 wrote to memory of 4520	3920	cmd.exe	87
PID 3920 wrote to memory of 4520	3920	cmd.exe	87
PID 3920 wrote to memory of 3640	3920	cmd.exe	88
PID 3920 wrote to memory of 3640	3920	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:528
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "windows defender firewall" /tr '"C:\Users\Admin\AppData\Roaming\windows defender firewall.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4876
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "windows defender firewall" /tr '"C:\Users\Admin\AppData\Roaming\windows defender firewall.exe"'
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4016
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp7B1B.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3920
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:4520
- - C:\Users\Admin\AppData\Roaming\windows defender firewall.exe
    "C:\Users\Admin\AppData\Roaming\windows defender firewall.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:3640

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp7B1B.tmp.bat

Filesize
169B

MD5
d0f935c3f169b7fa291c9ccfc69f21de

SHA1
64f1a307292375b950058cdd5e088dd216ece8c0

SHA256
ac390f150c03f4939be0e71db69cf5e8364093e82da587a56c2e9f1929d36365

SHA512
5592cff162fc8cfa47bf7cf7f9160d722fc0bf1b0910f4b47a89255755b32f21778ea914a9a5c2dc1e82a3c2a35c791b8be6ef041c2cb2d381c62233b7a398d0

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

Filesize
63KB

MD5
4ae421ab5dc26aad7211a5bcc6ae89f2

SHA1
90f1c09a58087d15688db7bf63ae889d8b453751

SHA256
884eacb6f51be1e6eba1296aece06baccd3f600f258494fef2dfcc34fd257ccd

SHA512
0b9689d6718749b03a38d3f681cb62f70eb96438a24ad0ca0177ffa53c70bebe8bc3e28ef46df5165baaf11a876df3fe27f5ece785f748ac2b467d79a51eb1c2

Download Submit
memory/528-0-0x00007FFE3D2D3000-0x00007FFE3D2D5000-memory.dmp

Filesize
8KB

Download
memory/528-1-0x0000000000CF0000-0x0000000000D06000-memory.dmp

Filesize
88KB

Download
memory/528-2-0x00007FFE3D2D0000-0x00007FFE3DD91000-memory.dmp

Filesize
10.8MB

Download
memory/528-7-0x00007FFE3D2D0000-0x00007FFE3DD91000-memory.dmp

Filesize
10.8MB

Download
memory/528-8-0x00007FFE3D2D0000-0x00007FFE3DD91000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads