asyncrat | 530fb8b9a65df5bf633a5dc8d71bd88e60467a57f7579e8c8507c28bf20ac146

Analysis

max time kernel
32s
max time network
36s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
17-10-2024 20:17

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General

Target

aaa.exe
Size

149KB
MD5

3d2739b6db356076ff403d1894488e0a
SHA1

9a5b9a171c84022a295617f0abe0a28d4cbf1490
SHA256

530fb8b9a65df5bf633a5dc8d71bd88e60467a57f7579e8c8507c28bf20ac146
SHA512

e8fe7979f61ae37dc806b57525692a8fed62ee21bbe797a994f99718b5424d476af3a57c50f1dff7fecc111a9323c2601a5885ed08a9fbf8e0f6479f3b3d0242
SSDEEP

3072:V5KFwkerGanuj1Geh+zg0oF/k4wFdbPXVXQyvHTeaoFU:V5qwLGauj1/yg3adbPXVXQyvX

Score

10^/10

asyncrat default discovery persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

Mutex

4bRCHiUOS9Sw

Attributes

delay
3
install
false
install_folder
%AppData%
pastebin_config
https://pastebin.com/raw/sXFJs1iM

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

aaa.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\2024 = "C:\\ProgramData\\aaa.exe"	aaa.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 3 IoCs

Web Service
T1102

Processes:

flow ioc

24 4.tcp.eu.ngrok.io
22 pastebin.com
23 pastebin.com
Suspicious use of SetThreadContext 1 IoCs

Processes:

aaa.exe

description pid process target process

PID 3948 set thread context of 2040 3948 aaa.exe RegAsm.exe
System Location Discovery: System Language Discovery 1 TTPs 1 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
discovery

System Language Discovery
T1614.001

Processes:

RegAsm.exe

description ioc process

Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language RegAsm.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

RegAsm.exe

description pid process

Token: SeDebugPrivilege 2040 RegAsm.exe

flow	ioc
24	4.tcp.eu.ngrok.io
22	pastebin.com
23	pastebin.com

description	pid	process	target process
PID 3948 set thread context of 2040	3948	aaa.exe	RegAsm.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RegAsm.exe

description	pid	process
Token: SeDebugPrivilege	2040	RegAsm.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

aaa.exe

description	pid	process	target process
PID 3948 wrote to memory of 2040	3948	aaa.exe	RegAsm.exe
PID 3948 wrote to memory of 2040	3948	aaa.exe	RegAsm.exe
PID 3948 wrote to memory of 2040	3948	aaa.exe	RegAsm.exe
PID 3948 wrote to memory of 2040	3948	aaa.exe	RegAsm.exe
PID 3948 wrote to memory of 2040	3948	aaa.exe	RegAsm.exe
PID 3948 wrote to memory of 2040	3948	aaa.exe	RegAsm.exe
PID 3948 wrote to memory of 2040	3948	aaa.exe	RegAsm.exe
PID 3948 wrote to memory of 2040	3948	aaa.exe	RegAsm.exe

C:\Users\Admin\AppData\Local\Temp\aaa.exe
"C:\Users\Admin\AppData\Local\Temp\aaa.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3948

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
"C:\\Windows\\Microsoft.NET\\Framework\\v4.0.30319\\RegAsm.exe"
2⤵
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:2040

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

memory/2040-10-0x0000000006890000-0x0000000006E34000-memory.dmp

Filesize
5.6MB

Download
memory/2040-12-0x000000007468E000-0x000000007468F000-memory.dmp

Filesize
4KB

Download
memory/2040-3-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2040-5-0x000000007468E000-0x000000007468F000-memory.dmp

Filesize
4KB

Download
memory/2040-6-0x0000000074680000-0x0000000074E30000-memory.dmp

Filesize
7.7MB

Download
memory/2040-9-0x0000000006020000-0x00000000060BC000-memory.dmp

Filesize
624KB

Download
memory/2040-17-0x0000000074680000-0x0000000074E30000-memory.dmp

Filesize
7.7MB

Download
memory/2040-16-0x0000000007670000-0x0000000007702000-memory.dmp

Filesize
584KB

Download
memory/2040-14-0x0000000007200000-0x0000000007268000-memory.dmp

Filesize
416KB

Download
memory/2040-13-0x0000000007280000-0x00000000072F6000-memory.dmp

Filesize
472KB

Download
memory/2040-11-0x0000000006350000-0x00000000063B6000-memory.dmp

Filesize
408KB

Download
memory/2040-15-0x0000000007340000-0x000000000735E000-memory.dmp

Filesize
120KB

Download
memory/3948-0-0x00007FF95A713000-0x00007FF95A715000-memory.dmp

Filesize
8KB

Download
memory/3948-1-0x0000000000D50000-0x0000000000D7C000-memory.dmp

Filesize
176KB

Download