asyncrat | 530fb8b9a65df5bf633a5dc8d71bd88e60467a57f7579e8c8507c28bf20ac146

Analysis

max time kernel
118s
max time network
148s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
17-10-2024 20:21

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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-1-5-21-2039016743-699959520-214465309-1000\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

4 pastebin.com
5 pastebin.com
6 4.tcp.eu.ngrok.io
Suspicious use of SetThreadContext 1 IoCs

Processes:

aaa.exe

description pid process target process

PID 2708 set thread context of 2100 2708 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 2100 RegAsm.exe

flow	ioc
4	pastebin.com
5	pastebin.com
6	4.tcp.eu.ngrok.io

description	pid	process	target process
PID 2708 set thread context of 2100	2708	aaa.exe	RegAsm.exe

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

description	pid	process
Token: SeDebugPrivilege	2100	RegAsm.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

aaa.exe

description	pid	process	target process
PID 2708 wrote to memory of 2100	2708	aaa.exe	RegAsm.exe
PID 2708 wrote to memory of 2100	2708	aaa.exe	RegAsm.exe
PID 2708 wrote to memory of 2100	2708	aaa.exe	RegAsm.exe
PID 2708 wrote to memory of 2100	2708	aaa.exe	RegAsm.exe
PID 2708 wrote to memory of 2100	2708	aaa.exe	RegAsm.exe
PID 2708 wrote to memory of 2100	2708	aaa.exe	RegAsm.exe
PID 2708 wrote to memory of 2100	2708	aaa.exe	RegAsm.exe
PID 2708 wrote to memory of 2100	2708	aaa.exe	RegAsm.exe
PID 2708 wrote to memory of 2100	2708	aaa.exe	RegAsm.exe
PID 2708 wrote to memory of 2100	2708	aaa.exe	RegAsm.exe
PID 2708 wrote to memory of 2100	2708	aaa.exe	RegAsm.exe
PID 2708 wrote to memory of 2100	2708	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:2708

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:2100

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

C:\Users\Admin\AppData\Local\Temp\CabCC17.tmp

Filesize
70KB

MD5
49aebf8cbd62d92ac215b2923fb1b9f5

SHA1
1723be06719828dda65ad804298d0431f6aff976

SHA256
b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

SHA512
bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

Download Submit
memory/2100-3-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2100-8-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2100-12-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2100-10-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2100-7-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2100-6-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2100-5-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2100-4-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2708-0-0x000007FEF5F13000-0x000007FEF5F14000-memory.dmp

Filesize
4KB

Download
memory/2708-1-0x0000000000360000-0x000000000038C000-memory.dmp

Filesize
176KB

Download