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 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/2032-2-0x000001DD8BF20000-0x000001DD8BF38000-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-1-5-21-1045988481-1457812719-2617974652-1000\Control Panel\International\Geo\Nation	rust-dotnet-crypter.exe

Executes dropped EXE 1 IoCs

pid	Process
3184	Chrome.exe

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
4824	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
4328	timeout.exe

Suspicious behavior: EnumeratesProcesses 30 IoCs

pid	Process
2032	rust-dotnet-crypter.exe
2032	rust-dotnet-crypter.exe
2032	rust-dotnet-crypter.exe
2032	rust-dotnet-crypter.exe
2032	rust-dotnet-crypter.exe
2032	rust-dotnet-crypter.exe
2032	rust-dotnet-crypter.exe
2032	rust-dotnet-crypter.exe
2032	rust-dotnet-crypter.exe
2032	rust-dotnet-crypter.exe
2032	rust-dotnet-crypter.exe
2032	rust-dotnet-crypter.exe
2032	rust-dotnet-crypter.exe
2032	rust-dotnet-crypter.exe
2032	rust-dotnet-crypter.exe
2032	rust-dotnet-crypter.exe
2032	rust-dotnet-crypter.exe
2032	rust-dotnet-crypter.exe
2032	rust-dotnet-crypter.exe
2032	rust-dotnet-crypter.exe
3184	Chrome.exe
3184	Chrome.exe
3184	Chrome.exe
3184	Chrome.exe
3184	Chrome.exe
3184	Chrome.exe
3184	Chrome.exe
3184	Chrome.exe
3184	Chrome.exe
3184	Chrome.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2032	rust-dotnet-crypter.exe
Token: SeDebugPrivilege	3184	Chrome.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3184	Chrome.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2032 wrote to memory of 1072	2032	rust-dotnet-crypter.exe	84
PID 2032 wrote to memory of 1072	2032	rust-dotnet-crypter.exe	84
PID 2032 wrote to memory of 3556	2032	rust-dotnet-crypter.exe	86
PID 2032 wrote to memory of 3556	2032	rust-dotnet-crypter.exe	86
PID 1072 wrote to memory of 4824	1072	cmd.exe	90
PID 1072 wrote to memory of 4824	1072	cmd.exe	90
PID 3556 wrote to memory of 4328	3556	cmd.exe	91
PID 3556 wrote to memory of 4328	3556	cmd.exe	91
PID 3556 wrote to memory of 3184	3556	cmd.exe	92
PID 3556 wrote to memory of 3184	3556	cmd.exe	92

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:2032
- 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:1072
- - 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:4824
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpF38E.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3556
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:4328
- - 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:3184

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

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\tmpF38E.tmp.bat

Filesize
150B

MD5
f3ccd4adb8aebafacf0f577881f034ac

SHA1
6cf2c858403c505d0907b447ed7c450576ff608d

SHA256
c15e2e2430a728a24f9d4100a3216e8ac512729159e5707c87e8205f4f8435c9

SHA512
500d365fe6db38c3a03f1c473d884ca69b77754a5d2d94f530fc14152f839f7628943232bcd26f80f9fa2121c0ee38189f67d2f3fe7c8312a23962656302639c

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/2032-5-0x00007FFB1F9D0000-0x00007FFB20491000-memory.dmp

Filesize
10.8MB

Download
memory/2032-4-0x000001DDA6200000-0x000001DDA6210000-memory.dmp

Filesize
64KB

Download
memory/2032-6-0x000001DDA6200000-0x000001DDA6210000-memory.dmp

Filesize
64KB

Download
memory/2032-7-0x000001DDA6200000-0x000001DDA6210000-memory.dmp

Filesize
64KB

Download
memory/2032-8-0x000001DDA6200000-0x000001DDA6210000-memory.dmp

Filesize
64KB

Download
memory/2032-15-0x00007FFB2CDD0000-0x00007FFB2CDE9000-memory.dmp

Filesize
100KB

Download
memory/2032-14-0x00007FFB3E410000-0x00007FFB3E605000-memory.dmp

Filesize
2.0MB

Download
memory/2032-16-0x00007FFB1F9D0000-0x00007FFB20491000-memory.dmp

Filesize
10.8MB

Download
memory/2032-17-0x00007FFB3E410000-0x00007FFB3E605000-memory.dmp

Filesize
2.0MB

Download
memory/2032-0-0x00007FFB1F9D0000-0x00007FFB20491000-memory.dmp

Filesize
10.8MB

Download
memory/2032-3-0x000001DDA6200000-0x000001DDA6210000-memory.dmp

Filesize
64KB

Download
memory/2032-2-0x000001DD8BF20000-0x000001DD8BF38000-memory.dmp

Filesize
96KB

Download
memory/2032-1-0x000001DDA6200000-0x000001DDA6210000-memory.dmp

Filesize
64KB

Download
memory/3184-23-0x00007FFB1FA30000-0x00007FFB204F1000-memory.dmp

Filesize
10.8MB

Download
memory/3184-25-0x000001F66B710000-0x000001F66B720000-memory.dmp

Filesize
64KB

Download
memory/3184-24-0x000001F66B710000-0x000001F66B720000-memory.dmp

Filesize
64KB

Download
memory/3184-26-0x00007FFB1FA30000-0x00007FFB204F1000-memory.dmp

Filesize
10.8MB

Download
memory/3184-27-0x000001F66B710000-0x000001F66B720000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads