asyncrat | 4902c56dfa5b513df7c00f8fe5df90dcc46a03f194dca424ebbf6f03e7904486

Analysis

max time kernel
148s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
16-12-2024 20:36

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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
behavioral2/memory/4404-1-0x0000000000C50000-0x0000000000C82000-memory.dmp	family_stormkitty

Stormkitty family
stormkitty

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-1-5-21-4050598569-1597076380-177084960-1000\Control Panel\International\Geo\Nation	LET.exe

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) 9 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Local\2aaa12dad31401045ce3f346dfab13e6\Admin@YQRLKYON_en-US\Grabber\DRIVE-C\Users\Admin\Pictures\desktop.ini	LET.exe
File created	C:\Users\Admin\AppData\Local\2aaa12dad31401045ce3f346dfab13e6\Admin@YQRLKYON_en-US\Grabber\DRIVE-C\Users\Admin\Desktop\desktop.ini	LET.exe
File opened for modification	C:\Users\Admin\AppData\Local\2aaa12dad31401045ce3f346dfab13e6\Admin@YQRLKYON_en-US\Grabber\DRIVE-C\Users\Admin\Pictures\desktop.ini	LET.exe
File opened for modification	C:\Users\Admin\AppData\Local\2aaa12dad31401045ce3f346dfab13e6\Admin@YQRLKYON_en-US\Grabber\DRIVE-C\Users\Admin\Downloads\desktop.ini	LET.exe
File opened for modification	C:\Users\Admin\AppData\Local\2aaa12dad31401045ce3f346dfab13e6\Admin@YQRLKYON_en-US\Grabber\DRIVE-C\Users\Admin\Desktop\desktop.ini	LET.exe
File created	C:\Users\Admin\AppData\Local\2aaa12dad31401045ce3f346dfab13e6\Admin@YQRLKYON_en-US\Grabber\DRIVE-C\Users\Admin\Downloads\desktop.ini	LET.exe
File created	C:\Users\Admin\AppData\Local\2aaa12dad31401045ce3f346dfab13e6\Admin@YQRLKYON_en-US\Grabber\DRIVE-C\Users\Admin\Documents\desktop.ini	LET.exe
File created	C:\Users\Admin\AppData\Local\2aaa12dad31401045ce3f346dfab13e6\Admin@YQRLKYON_en-US\Grabber\DRIVE-C\Users\Admin\Pictures\Camera Roll\desktop.ini	LET.exe
File created	C:\Users\Admin\AppData\Local\2aaa12dad31401045ce3f346dfab13e6\Admin@YQRLKYON_en-US\Grabber\DRIVE-C\Users\Admin\Pictures\Saved 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
13	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 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
Key value enumerated	\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	netsh.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	chcp.com
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	findstr.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	chcp.com
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.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
4772	netsh.exe
3328	cmd.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
904	schtasks.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe
4404	LET.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4404	LET.exe
Token: SeDebugPrivilege	4404	LET.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 4404 wrote to memory of 3328	4404	LET.exe	83
PID 4404 wrote to memory of 3328	4404	LET.exe	83
PID 4404 wrote to memory of 3328	4404	LET.exe	83
PID 3328 wrote to memory of 4968	3328	cmd.exe	85
PID 3328 wrote to memory of 4968	3328	cmd.exe	85
PID 3328 wrote to memory of 4968	3328	cmd.exe	85
PID 3328 wrote to memory of 4772	3328	cmd.exe	86
PID 3328 wrote to memory of 4772	3328	cmd.exe	86
PID 3328 wrote to memory of 4772	3328	cmd.exe	86
PID 3328 wrote to memory of 2020	3328	cmd.exe	87
PID 3328 wrote to memory of 2020	3328	cmd.exe	87
PID 3328 wrote to memory of 2020	3328	cmd.exe	87
PID 4404 wrote to memory of 1284	4404	LET.exe	88
PID 4404 wrote to memory of 1284	4404	LET.exe	88
PID 4404 wrote to memory of 1284	4404	LET.exe	88
PID 1284 wrote to memory of 1648	1284	cmd.exe	90
PID 1284 wrote to memory of 1648	1284	cmd.exe	90
PID 1284 wrote to memory of 1648	1284	cmd.exe	90
PID 1284 wrote to memory of 4156	1284	cmd.exe	91
PID 1284 wrote to memory of 4156	1284	cmd.exe	91
PID 1284 wrote to memory of 4156	1284	cmd.exe	91
PID 4404 wrote to memory of 904	4404	LET.exe	95
PID 4404 wrote to memory of 904	4404	LET.exe	95
PID 4404 wrote to memory of 904	4404	LET.exe	95

C:\Users\Admin\AppData\Local\Temp\LET.exe
"C:\Users\Admin\AppData\Local\Temp\LET.exe"
1⤵
- Checks computer location settings
- 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:4404
- 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:3328
- - C:\Windows\SysWOW64\chcp.com
    chcp 65001
    3⤵
    - System Location Discovery: System Language Discovery
    PID:4968
- - 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:4772
- - C:\Windows\SysWOW64\findstr.exe
    findstr All
    3⤵
    - System Location Discovery: System Language Discovery
    PID:2020
- 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:1284
- - C:\Windows\SysWOW64\chcp.com
    chcp 65001
    3⤵
    - System Location Discovery: System Language Discovery
    PID:1648
- - 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:4156
- 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:904

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\2aaa12dad31401045ce3f346dfab13e6\Admin@YQRLKYON_en-US\Browsers\Firefox\Bookmarks.txt

Filesize
105B

MD5
2e9d094dda5cdc3ce6519f75943a4ff4

SHA1
5d989b4ac8b699781681fe75ed9ef98191a5096c

SHA256
c84c98bbf5e0ef9c8d0708b5d60c5bb656b7d6be5135d7f7a8d25557e08cf142

SHA512
d1f7eed00959e902bdb2125b91721460d3ff99f3bdfc1f2a343d4f58e8d4e5e5a06c0c6cdc0379211c94510f7c00d7a8b34fa7d0ca0c3d54cbbe878f1e9812b7

Download Submit
C:\Users\Admin\AppData\Local\2aaa12dad31401045ce3f346dfab13e6\Admin@YQRLKYON_en-US\System\Process.txt

Filesize
4KB

MD5
f224f94636720f049def913bc2d14e29

SHA1
7b26b12be423b75a406cd81e39cae4c8d19e7c03

SHA256
78a383fc92023f12e531dd243f43b96f9768649c1c72bcc8aeb95cd4ab1a2314

SHA512
65710c22ebeb8c1f65ba17e636401c384f4598105fdd1eb78e59266deb9b34682ad11bb643a59472f39f9ad6dce6ed270d3f25a4a80a90a22449a3affae2079f

Download Submit
C:\Users\Admin\AppData\Local\4c1d930a39baf0b756ecd84f1a931ab9\msgid.dat

Filesize
1B

MD5
cfcd208495d565ef66e7dff9f98764da

SHA1
b6589fc6ab0dc82cf12099d1c2d40ab994e8410c

SHA256
5feceb66ffc86f38d952786c6d696c79c2dbc239dd4e91b46729d73a27fb57e9

SHA512
31bca02094eb78126a517b206a88c73cfa9ec6f704c7030d18212cace820f025f00bf0ea68dbf3f3a5436ca63b53bf7bf80ad8d5de7d8359d0b7fed9dbc3ab99

Download Submit
memory/4404-3-0x00000000749D0000-0x0000000075180000-memory.dmp

Filesize
7.7MB

Download
memory/4404-4-0x00000000064B0000-0x0000000006A54000-memory.dmp

Filesize
5.6MB

Download
memory/4404-5-0x0000000005FE0000-0x0000000006072000-memory.dmp

Filesize
584KB

Download
memory/4404-0-0x00000000749DE000-0x00000000749DF000-memory.dmp

Filesize
4KB

Download
memory/4404-2-0x00000000054F0000-0x0000000005556000-memory.dmp

Filesize
408KB

Download
memory/4404-145-0x00000000749DE000-0x00000000749DF000-memory.dmp

Filesize
4KB

Download
memory/4404-146-0x00000000749D0000-0x0000000075180000-memory.dmp

Filesize
7.7MB

Download
memory/4404-147-0x00000000749D0000-0x0000000075180000-memory.dmp

Filesize
7.7MB

Download
memory/4404-152-0x0000000006D70000-0x0000000006D7A000-memory.dmp

Filesize
40KB

Download
memory/4404-1-0x0000000000C50000-0x0000000000C82000-memory.dmp

Filesize
200KB

Download
memory/4404-158-0x00000000749D0000-0x0000000075180000-memory.dmp

Filesize
7.7MB

Download
memory/4404-159-0x0000000007780000-0x000000000778A000-memory.dmp

Filesize
40KB

Download