asyncrat | 4902c56dfa5b513df7c00f8fe5df90dcc46a03f194dca424ebbf6f03e7904486

Analysis

max time kernel
148s
max time network
120s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
16-12-2024 20:48

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General

Target

LET.exe
Size

175KB
MD5

c7235b3be7873e0743aba6235cd3d677
SHA1

2481321813caff4ded19135c86301f899fb19f66
SHA256

4902c56dfa5b513df7c00f8fe5df90dcc46a03f194dca424ebbf6f03e7904486
SHA512

7310beb111ca489fd6348d40cea921d8854d99858cb2b9dc7d8211009a8c958374832f585f2cb25962e7ed3a453ca11102b7fb47be0eff8d2a7bc2b564928860
SSDEEP

3072:r+ljDT+LbaRzegOBIIj6HLLYLCYJqvc1Dvu0gRsBaV/m4IauJX9bSM2dE+rBiQ+t:UDubaBBOBIIj6HLLYLCYJqvc1D2NsBMy

Score

10^/10

asyncrat stormkitty default discovery persistence privilege_escalation rat spyware stealer

Malware Config

Extracted

Family

asyncrat

Botnet

Default

127.0.0.1:6606

127.0.0.1:7707

127.0.0.1:8808

https://api.telegram.org/bot7044437613:AAEXeS1SKGTrEjQ8F-7vSegWo8OLABeJY5k/sendMessage?chat_id=6052812018

Mutex

AsyncMutex_6SI8OkPnk

Attributes

delay
3
install
false
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
StormKitty
StormKitty is an open source info stealer written in C#.
stealer stormkitty

StormKitty payload 1 IoCs

resource	yara_rule
behavioral1/memory/1728-1-0x0000000000C10000-0x0000000000C42000-memory.dmp	family_stormkitty

Stormkitty family
stormkitty
Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003

Drops desktop.ini file(s) 5 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Local\635b77246a35226487b89759e6ed3146\Admin@PIDEURYY_en-US\Grabber\DRIVE-C\Users\Admin\Desktop\desktop.ini	LET.exe
File opened for modification	C:\Users\Admin\AppData\Local\635b77246a35226487b89759e6ed3146\Admin@PIDEURYY_en-US\Grabber\DRIVE-C\Users\Admin\Desktop\desktop.ini	LET.exe
File created	C:\Users\Admin\AppData\Local\635b77246a35226487b89759e6ed3146\Admin@PIDEURYY_en-US\Grabber\DRIVE-C\Users\Admin\Downloads\desktop.ini	LET.exe
File created	C:\Users\Admin\AppData\Local\635b77246a35226487b89759e6ed3146\Admin@PIDEURYY_en-US\Grabber\DRIVE-C\Users\Admin\Documents\desktop.ini	LET.exe
File created	C:\Users\Admin\AppData\Local\635b77246a35226487b89759e6ed3146\Admin@PIDEURYY_en-US\Grabber\DRIVE-C\Users\Admin\Pictures\desktop.ini	LET.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
4	icanhazip.com

Looks up geolocation information via web service
Uses a legitimate geolocation service to find the infected system's geolocation info.
Browser Information Discovery 1 TTPs
Enumerate browser information.
discovery

Browser Information Discovery
T1217
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Event Triggered Execution: Netsh Helper DLL 1 TTPs 6 IoCs

Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

persistence privilege_escalation

Netsh Helper DLL

T1546.007

description	ioc	Process
Key value enumerated	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\NetSh	netsh.exe
Key opened	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\NetSh	netsh.exe
Key queried	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\NetSh	netsh.exe
Key value enumerated	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\NetSh	netsh.exe
Key opened	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\NetSh	netsh.exe
Key queried	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\NetSh	netsh.exe

System Location Discovery: System Language Discovery 1 TTPs 9 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

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	chcp.com
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	chcp.com
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	LET.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	findstr.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

System Network Configuration Discovery: Wi-Fi Discovery 1 TTPs 2 IoCs

Adversaries may search for information about Wi-Fi networks, such as network names and passwords, on compromised systems.

discovery

Wi-Fi Discovery

T1016.002

pid	Process
2692	cmd.exe
840	netsh.exe

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\Description\System\CentralProcessor\0	LET.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	LET.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
1604	schtasks.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe
1728	LET.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1728	LET.exe
Token: SeDebugPrivilege	1728	LET.exe

Suspicious use of WriteProcessMemory 32 IoCs

description	pid	Process	procid_target
PID 1728 wrote to memory of 2692	1728	LET.exe	32
PID 1728 wrote to memory of 2692	1728	LET.exe	32
PID 1728 wrote to memory of 2692	1728	LET.exe	32
PID 1728 wrote to memory of 2692	1728	LET.exe	32
PID 2692 wrote to memory of 1048	2692	cmd.exe	34
PID 2692 wrote to memory of 1048	2692	cmd.exe	34
PID 2692 wrote to memory of 1048	2692	cmd.exe	34
PID 2692 wrote to memory of 1048	2692	cmd.exe	34
PID 2692 wrote to memory of 840	2692	cmd.exe	35
PID 2692 wrote to memory of 840	2692	cmd.exe	35
PID 2692 wrote to memory of 840	2692	cmd.exe	35
PID 2692 wrote to memory of 840	2692	cmd.exe	35
PID 2692 wrote to memory of 1328	2692	cmd.exe	36
PID 2692 wrote to memory of 1328	2692	cmd.exe	36
PID 2692 wrote to memory of 1328	2692	cmd.exe	36
PID 2692 wrote to memory of 1328	2692	cmd.exe	36
PID 1728 wrote to memory of 1936	1728	LET.exe	37
PID 1728 wrote to memory of 1936	1728	LET.exe	37
PID 1728 wrote to memory of 1936	1728	LET.exe	37
PID 1728 wrote to memory of 1936	1728	LET.exe	37
PID 1936 wrote to memory of 2820	1936	cmd.exe	39
PID 1936 wrote to memory of 2820	1936	cmd.exe	39
PID 1936 wrote to memory of 2820	1936	cmd.exe	39
PID 1936 wrote to memory of 2820	1936	cmd.exe	39
PID 1936 wrote to memory of 3004	1936	cmd.exe	40
PID 1936 wrote to memory of 3004	1936	cmd.exe	40
PID 1936 wrote to memory of 3004	1936	cmd.exe	40
PID 1936 wrote to memory of 3004	1936	cmd.exe	40
PID 1728 wrote to memory of 1604	1728	LET.exe	41
PID 1728 wrote to memory of 1604	1728	LET.exe	41
PID 1728 wrote to memory of 1604	1728	LET.exe	41
PID 1728 wrote to memory of 1604	1728	LET.exe	41

C:\Users\Admin\AppData\Local\Temp\LET.exe
"C:\Users\Admin\AppData\Local\Temp\LET.exe"
1⤵
- Drops desktop.ini file(s)
- System Location Discovery: System Language Discovery
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1728
- C:\Windows\SysWOW64\cmd.exe
  "cmd.exe" /C chcp 65001 && netsh wlan show profile | findstr All
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Wi-Fi Discovery
  - Suspicious use of WriteProcessMemory
  PID:2692
- - C:\Windows\SysWOW64\chcp.com
    chcp 65001
    3⤵
    - System Location Discovery: System Language Discovery
    PID:1048
- - C:\Windows\SysWOW64\netsh.exe
    netsh wlan show profile
    3⤵
    - Event Triggered Execution: Netsh Helper DLL
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Wi-Fi Discovery
    PID:840
- - C:\Windows\SysWOW64\findstr.exe
    findstr All
    3⤵
    - System Location Discovery: System Language Discovery
    PID:1328
- C:\Windows\SysWOW64\cmd.exe
  "cmd.exe" /C chcp 65001 && netsh wlan show networks mode=bssid
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1936
- - C:\Windows\SysWOW64\chcp.com
    chcp 65001
    3⤵
    - System Location Discovery: System Language Discovery
    PID:2820
- - C:\Windows\SysWOW64\netsh.exe
    netsh wlan show networks mode=bssid
    3⤵
    - Event Triggered Execution: Netsh Helper DLL
    - System Location Discovery: System Language Discovery
    PID:3004
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /sc ONLOGON /RL HIGHEST /tn "Chrome Update" /tr "C:\Users\Admin\AppData\Local\Temp\LET.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:1604

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Event Triggered Execution

T1546

Netsh Helper DLL

T1546.007

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Event Triggered Execution

T1546

Netsh Helper DLL

T1546.007

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Browser Information Discovery

T1217

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

System Network Configuration Discovery

T1016

Wi-Fi Discovery

T1016.002

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\232211ad3829ca9552ccfbb01826f679\msgid.dat

Filesize
1B

MD5
cfcd208495d565ef66e7dff9f98764da

SHA1
b6589fc6ab0dc82cf12099d1c2d40ab994e8410c

SHA256
5feceb66ffc86f38d952786c6d696c79c2dbc239dd4e91b46729d73a27fb57e9

SHA512
31bca02094eb78126a517b206a88c73cfa9ec6f704c7030d18212cace820f025f00bf0ea68dbf3f3a5436ca63b53bf7bf80ad8d5de7d8359d0b7fed9dbc3ab99

Download Submit
memory/1728-0-0x0000000074C5E000-0x0000000074C5F000-memory.dmp

Filesize
4KB

Download
memory/1728-1-0x0000000000C10000-0x0000000000C42000-memory.dmp

Filesize
200KB

Download
memory/1728-2-0x0000000074C50000-0x000000007533E000-memory.dmp

Filesize
6.9MB

Download
memory/1728-73-0x0000000074C50000-0x000000007533E000-memory.dmp

Filesize
6.9MB

Download
memory/1728-77-0x0000000074C5E000-0x0000000074C5F000-memory.dmp

Filesize
4KB

Download
memory/1728-78-0x0000000074C50000-0x000000007533E000-memory.dmp

Filesize
6.9MB

Download
memory/1728-84-0x0000000074C50000-0x000000007533E000-memory.dmp

Filesize
6.9MB

Download