asyncrat | 40fc53c469a44a2d699f3e4e7a72c71e4c667d89988e234e24358cdaf107b2d7

Analysis

max time kernel
146s
max time network
137s
platform
windows10-2004_x64
resource
win10v2004-20230220-en
resource tags

arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
submitted
25/04/2023, 20:16

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General

Target
Server.exe
Size 175KB
Sample230425-y2maxscf98
SHA256 40fc53c469a44a2d699f3e4e7a72c71e4c667d89988e234e24358cdaf107b2d7
MD5 f17cbcf0106d8b21ffafad25f0378a40
SHA1 ab622cb14f27231f897d145f396ea84b6032f329
SHA512 c762eabd8d081320ae10fa2dac9ab9aa050ddc855dff26f2ca0e1318112438ce62e7e038dc7ac6773732a414ffd6fbd453aa97bbb31595afc507733a6741159f
SSDEEP 3072:7e8oX8Sb5KcXrtkkXmf/bDsvqtU+lLToChAP0UZ0b2gTewAqE+Wpor:mXtb5KcXr7XmfgqtjhAxZ0b2D
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

asyncrat stormkitty default 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/bot6233379490:AAFcJwp1PoTus6nSbmrvxY3xNfvyZvm2w3c/sendMessage?chat_id=5471630718

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
StormKitty
StormKitty is an open source info stealer written in C#.
stealer stormkitty

StormKitty payload 1 IoCs

resource	yara_rule
behavioral2/memory/4384-133-0x0000000000D80000-0x0000000000DB2000-memory.dmp	family_stormkitty

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral2/memory/4384-133-0x0000000000D80000-0x0000000000DB2000-memory.dmp	asyncrat

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081

Drops desktop.ini file(s) 7 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Local\fe89802a179b1948c137053dc9a6eead\Admin@WEYPCEWN_en-US\Grabber\DRIVE-C\Users\Admin\Documents\desktop.ini	Server.exe
File created	C:\Users\Admin\AppData\Local\fe89802a179b1948c137053dc9a6eead\Admin@WEYPCEWN_en-US\Grabber\DRIVE-C\Users\Admin\Pictures\desktop.ini	Server.exe
File created	C:\Users\Admin\AppData\Local\fe89802a179b1948c137053dc9a6eead\Admin@WEYPCEWN_en-US\Grabber\DRIVE-C\Users\Admin\Desktop\desktop.ini	Server.exe
File created	C:\Users\Admin\AppData\Local\fe89802a179b1948c137053dc9a6eead\Admin@WEYPCEWN_en-US\Grabber\DRIVE-C\Users\Admin\Pictures\Camera Roll\desktop.ini	Server.exe
File created	C:\Users\Admin\AppData\Local\fe89802a179b1948c137053dc9a6eead\Admin@WEYPCEWN_en-US\Grabber\DRIVE-C\Users\Admin\Pictures\Saved Pictures\desktop.ini	Server.exe
File created	C:\Users\Admin\AppData\Local\fe89802a179b1948c137053dc9a6eead\Admin@WEYPCEWN_en-US\Grabber\DRIVE-C\Users\Admin\Downloads\desktop.ini	Server.exe
File opened for modification	C:\Users\Admin\AppData\Local\fe89802a179b1948c137053dc9a6eead\Admin@WEYPCEWN_en-US\Grabber\DRIVE-C\Users\Admin\Downloads\desktop.ini	Server.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
26	icanhazip.com

Looks up geolocation information via web service
Uses a legitimate geolocation service to find the infected system's geolocation info.

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 value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	Server.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\Description\System\CentralProcessor\0	Server.exe

Suspicious behavior: EnumeratesProcesses 29 IoCs

pid	Process
4384	Server.exe
4384	Server.exe
4384	Server.exe
4384	Server.exe
4384	Server.exe
4384	Server.exe
4384	Server.exe
4384	Server.exe
4384	Server.exe
4384	Server.exe
4384	Server.exe
4384	Server.exe
4384	Server.exe
4384	Server.exe
4384	Server.exe
4384	Server.exe
4384	Server.exe
4384	Server.exe
4384	Server.exe
4384	Server.exe
4384	Server.exe
4384	Server.exe
4384	Server.exe
4384	Server.exe
4384	Server.exe
4384	Server.exe
4384	Server.exe
4384	Server.exe
4384	Server.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4384	Server.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 4384 wrote to memory of 2672	4384	Server.exe	90
PID 4384 wrote to memory of 2672	4384	Server.exe	90
PID 4384 wrote to memory of 2672	4384	Server.exe	90
PID 2672 wrote to memory of 876	2672	cmd.exe	92
PID 2672 wrote to memory of 876	2672	cmd.exe	92
PID 2672 wrote to memory of 876	2672	cmd.exe	92
PID 2672 wrote to memory of 4696	2672	cmd.exe	93
PID 2672 wrote to memory of 4696	2672	cmd.exe	93
PID 2672 wrote to memory of 4696	2672	cmd.exe	93
PID 2672 wrote to memory of 3352	2672	cmd.exe	94
PID 2672 wrote to memory of 3352	2672	cmd.exe	94
PID 2672 wrote to memory of 3352	2672	cmd.exe	94
PID 4384 wrote to memory of 3936	4384	Server.exe	95
PID 4384 wrote to memory of 3936	4384	Server.exe	95
PID 4384 wrote to memory of 3936	4384	Server.exe	95
PID 3936 wrote to memory of 4484	3936	cmd.exe	97
PID 3936 wrote to memory of 4484	3936	cmd.exe	97
PID 3936 wrote to memory of 4484	3936	cmd.exe	97
PID 3936 wrote to memory of 4140	3936	cmd.exe	98
PID 3936 wrote to memory of 4140	3936	cmd.exe	98
PID 3936 wrote to memory of 4140	3936	cmd.exe	98

C:\Users\Admin\AppData\Local\Temp\Server.exe
"C:\Users\Admin\AppData\Local\Temp\Server.exe"
1⤵
- Drops desktop.ini file(s)
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4384
- C:\Windows\SysWOW64\cmd.exe
  "cmd.exe" /C chcp 65001 && netsh wlan show profile | findstr All
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2672
- - C:\Windows\SysWOW64\chcp.com
    chcp 65001
    3⤵
    PID:876
- - C:\Windows\SysWOW64\netsh.exe
    netsh wlan show profile
    3⤵
    PID:4696
- - C:\Windows\SysWOW64\findstr.exe
    findstr All
    3⤵
    PID:3352
- C:\Windows\SysWOW64\cmd.exe
  "cmd.exe" /C chcp 65001 && netsh wlan show networks mode=bssid
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3936
- - C:\Windows\SysWOW64\chcp.com
    chcp 65001
    3⤵
    PID:4484
- - C:\Windows\SysWOW64\netsh.exe
    netsh wlan show networks mode=bssid
    3⤵
    PID:4140

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

T1081

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

msgid.dat

Path C:\Users\Admin\AppData\Local\a2d9d8ccf87f1c16a0350030e81cad89\msgid.dat
Size 1B
SHA256 5feceb66ffc86f38d952786c6d696c79c2dbc239dd4e91b46729d73a27fb57e9
MD5 cfcd208495d565ef66e7dff9f98764da
SHA1 b6589fc6ab0dc82cf12099d1c2d40ab994e8410c
SHA512 31bca02094eb78126a517b206a88c73cfa9ec6f704c7030d18212cace820f025f00bf0ea68dbf3f3a5436ca63b53bf7bf80ad8d5de7d8359d0b7fed9dbc3ab99
MD5 SHA1 SHA512

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Process.txt

Path C:\Users\Admin\AppData\Local\fe89802a179b1948c137053dc9a6eead\Admin@WEYPCEWN_en-US\System\Process.txt
Size 4KB
SHA256 65e2c0ac882cad140ea1d9e11bc69a48b792ed4449a33ab9016b88347897bcf6
MD5 c11252598c159050458d87beb22a36c4
SHA1 adc91aa4ed6af057d28b23e60cf2bf66915eb277
SHA512 6662c49e40238979ef228b1497c16bf2d73e0172c87df1e98d25d0f44ab24cc84c3e5bd3b12af5ec1ef474c15dcea58051db411ccbcb0bdb4a6557e542472660
SSDEEP 48:+vbc7HTZjaDpoPH23ruT+45MiGb1u02i8EqZ:4w7HTZjaloPH23ruTFGBhP8Eq
MD5 SHA1 SHA512 SSDEEP

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memory/4384-133-0x0000000000D80000-0x0000000000DB2000-memory.dmp

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memory/4384-134-0x0000000005730000-0x0000000005740000-memory.dmp

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memory/4384-135-0x0000000005A40000-0x0000000005AA6000-memory.dmp

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memory/4384-190-0x0000000005730000-0x0000000005740000-memory.dmp

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memory/4384-278-0x0000000005730000-0x0000000005740000-memory.dmp

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memory/4384-279-0x0000000006680000-0x0000000006712000-memory.dmp

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memory/4384-280-0x0000000006CD0000-0x0000000007274000-memory.dmp

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memory/4384-284-0x00000000067B0000-0x00000000067BA000-memory.dmp

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memory/4384-285-0x0000000005730000-0x0000000005740000-memory.dmp

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memory/4384-291-0x0000000007680000-0x0000000007692000-memory.dmp

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