asyncrat | d759f7ea910f871740c8f5f920da899e231b285831e352c10ebe4e75ae7cb936

General

Target

rust-dotnet-crypter.exe
Size

348KB
MD5

addca39503803ebc2679b91ec072e4ea
SHA1

2cbc529d83090fb67f7a101c539ad319dbd84fff
SHA256

d759f7ea910f871740c8f5f920da899e231b285831e352c10ebe4e75ae7cb936
SHA512

7573259f3e566a55fb5eabf174e69842c7cdeacdc934819f6079d5e5e7f8048d6c7d500a22cc6e5422d71a2e831f7ddc605103b36ff8c51f387e7d64b0691c4a
SSDEEP

6144:69FXSy/ys7avHBUT9gwsEOH6x91U7VE4Po7yI77zrKMzK4Hwa:6DSmGf+T6udx9uVeGi

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

Venom RAT + HVNC + Stealer + Grabber v6.0.1

Botnet

Default

C2

185.17.0.246:4449

Mutex

tdlbdptyivwkvmnhtt

Attributes

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

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
behavioral2/memory/4448-0-0x0000027E287B0000-0x0000027E287C8000-memory.dmp	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-1-5-21-3027552071-446050021-1254071215-1000\Control Panel\International\Geo\Nation	rust-dotnet-crypter.exe

Executes dropped EXE 1 IoCs

pid	Process
3772	Chrome.exe

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012
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
4496	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
4544	timeout.exe

Suspicious behavior: EnumeratesProcesses 24 IoCs

pid	Process
4448	rust-dotnet-crypter.exe
4448	rust-dotnet-crypter.exe
4448	rust-dotnet-crypter.exe
4448	rust-dotnet-crypter.exe
4448	rust-dotnet-crypter.exe
4448	rust-dotnet-crypter.exe
4448	rust-dotnet-crypter.exe
4448	rust-dotnet-crypter.exe
4448	rust-dotnet-crypter.exe
4448	rust-dotnet-crypter.exe
4448	rust-dotnet-crypter.exe
4448	rust-dotnet-crypter.exe
4448	rust-dotnet-crypter.exe
4448	rust-dotnet-crypter.exe
4448	rust-dotnet-crypter.exe
4448	rust-dotnet-crypter.exe
4448	rust-dotnet-crypter.exe
4448	rust-dotnet-crypter.exe
4448	rust-dotnet-crypter.exe
4448	rust-dotnet-crypter.exe
4448	rust-dotnet-crypter.exe
3772	Chrome.exe
3772	Chrome.exe
3772	Chrome.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4448	rust-dotnet-crypter.exe
Token: SeDebugPrivilege	3772	Chrome.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3772	Chrome.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4448 wrote to memory of 1928	4448	rust-dotnet-crypter.exe	87
PID 4448 wrote to memory of 1928	4448	rust-dotnet-crypter.exe	87
PID 4448 wrote to memory of 2676	4448	rust-dotnet-crypter.exe	90
PID 4448 wrote to memory of 2676	4448	rust-dotnet-crypter.exe	90
PID 1928 wrote to memory of 4496	1928	cmd.exe	91
PID 1928 wrote to memory of 4496	1928	cmd.exe	91
PID 2676 wrote to memory of 4544	2676	cmd.exe	92
PID 2676 wrote to memory of 4544	2676	cmd.exe	92
PID 2676 wrote to memory of 3772	2676	cmd.exe	95
PID 2676 wrote to memory of 3772	2676	cmd.exe	95

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\rust-dotnet-crypter.exe
"C:\Users\Admin\AppData\Local\Temp\rust-dotnet-crypter.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4448
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Chrome" /tr '"C:\Users\Admin\AppData\Roaming\Chrome.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1928
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "Chrome" /tr '"C:\Users\Admin\AppData\Roaming\Chrome.exe"'
    3⤵
    - Creates scheduled task(s)
    PID:4496
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp7EF4.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2676
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:4544
- - C:\Users\Admin\AppData\Roaming\Chrome.exe
    "C:\Users\Admin\AppData\Roaming\Chrome.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    PID:3772

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

3

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\tmp7EF4.tmp.bat

Filesize
150B

MD5
c911392ed5efd363f3d33781b9f4d462

SHA1
1e7e9257c344b87a927e4f4005e034170ba28bfe

SHA256
6d512d2d96c50a62eb434713c8beb0419fc08901e457d322316556293f86608e

SHA512
0c03920f0d178808e9a34a54118885a924395b26177197c66d40c514a5e9c3f532f3b7b19354fcc72dc20fceb9a000010a3a34882a328c254c9c0956ed117fb2

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

Filesize
348KB

MD5
addca39503803ebc2679b91ec072e4ea

SHA1
2cbc529d83090fb67f7a101c539ad319dbd84fff

SHA256
d759f7ea910f871740c8f5f920da899e231b285831e352c10ebe4e75ae7cb936

SHA512
7573259f3e566a55fb5eabf174e69842c7cdeacdc934819f6079d5e5e7f8048d6c7d500a22cc6e5422d71a2e831f7ddc605103b36ff8c51f387e7d64b0691c4a

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

Filesize
348KB

MD5
addca39503803ebc2679b91ec072e4ea

SHA1
2cbc529d83090fb67f7a101c539ad319dbd84fff

SHA256
d759f7ea910f871740c8f5f920da899e231b285831e352c10ebe4e75ae7cb936

SHA512
7573259f3e566a55fb5eabf174e69842c7cdeacdc934819f6079d5e5e7f8048d6c7d500a22cc6e5422d71a2e831f7ddc605103b36ff8c51f387e7d64b0691c4a

Download Submit
C:\Users\Admin\AppData\Roaming\MyData\DataLogs.conf

Filesize
8B

MD5
cf759e4c5f14fe3eec41b87ed756cea8

SHA1
c27c796bb3c2fac929359563676f4ba1ffada1f5

SHA256
c9f9f193409217f73cc976ad078c6f8bf65d3aabcf5fad3e5a47536d47aa6761

SHA512
c7f832aee13a5eb36d145f35d4464374a9e12fa2017f3c2257442d67483b35a55eccae7f7729243350125b37033e075efbc2303839fd86b81b9b4dca3626953b

Download Submit
memory/3772-24-0x000001C0DCBF0000-0x000001C0DCC00000-memory.dmp

Filesize
64KB

Download
memory/3772-26-0x00007FFB521D0000-0x00007FFB52C91000-memory.dmp

Filesize
10.8MB

Download
memory/3772-30-0x000001C0DCBF0000-0x000001C0DCC00000-memory.dmp

Filesize
64KB

Download
memory/3772-29-0x000001C0DCBF0000-0x000001C0DCC00000-memory.dmp

Filesize
64KB

Download
memory/3772-27-0x000001C0DCBF0000-0x000001C0DCC00000-memory.dmp

Filesize
64KB

Download
memory/3772-28-0x000001C0DCBF0000-0x000001C0DCC00000-memory.dmp

Filesize
64KB

Download
memory/3772-25-0x000001C0DCBF0000-0x000001C0DCC00000-memory.dmp

Filesize
64KB

Download
memory/3772-23-0x00007FFB5AF90000-0x00007FFB5AFA9000-memory.dmp

Filesize
100KB

Download
memory/3772-22-0x000001C0DCBF0000-0x000001C0DCC00000-memory.dmp

Filesize
64KB

Download
memory/3772-19-0x00007FFB521D0000-0x00007FFB52C91000-memory.dmp

Filesize
10.8MB

Download
memory/3772-20-0x000001C0DCBF0000-0x000001C0DCC00000-memory.dmp

Filesize
64KB

Download
memory/3772-21-0x000001C0DCBF0000-0x000001C0DCC00000-memory.dmp

Filesize
64KB

Download
memory/4448-2-0x00007FFB521D0000-0x00007FFB52C91000-memory.dmp

Filesize
10.8MB

Download
memory/4448-3-0x0000027E429E0000-0x0000027E429F0000-memory.dmp

Filesize
64KB

Download
memory/4448-0-0x0000027E287B0000-0x0000027E287C8000-memory.dmp

Filesize
96KB

Download
memory/4448-4-0x0000027E429E0000-0x0000027E429F0000-memory.dmp

Filesize
64KB

Download
memory/4448-10-0x00007FFB6FBD0000-0x00007FFB6FDC5000-memory.dmp

Filesize
2.0MB

Download
memory/4448-5-0x0000027E429E0000-0x0000027E429F0000-memory.dmp

Filesize
64KB

Download
memory/4448-11-0x00007FFB5AF90000-0x00007FFB5AFA9000-memory.dmp

Filesize
100KB

Download
memory/4448-13-0x00007FFB6FBD0000-0x00007FFB6FDC5000-memory.dmp

Filesize
2.0MB

Download
memory/4448-12-0x00007FFB521D0000-0x00007FFB52C91000-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