asyncrat | 430d855fc783133d2d5bc01c095baff7d8b416a0f7c15a8a59288a96fcee7aa1

Analysis

max time kernel
144s
max time network
145s
platform
windows7_x64
resource
win7-20221111-en
resource tags

arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
submitted
16/01/2023, 16:54

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General

Target
ws.exe
Size 3.0MB
Sample230116-vejpqsaa96
SHA256 430d855fc783133d2d5bc01c095baff7d8b416a0f7c15a8a59288a96fcee7aa1
MD5 c9a81dcabe30d055caca7db9affe0248
SHA1 0e13ed377b15349ddef95c6eed281b46a50bbb5f
SHA512 4bb62f936e94c207715aa9bf854dda8c5d0aa4a50d97ac09df98721344e0d0ed85f4c77f03e067bceb052fa908335ad1d34648a2afe5b3fac81873e55b49566a
SSDEEP 49152:ug2G6sHJRXRTV7PH/4lrezRSmI4/6SWOyg5eO09rAq3h7twjklRUsd8OLWB7C7Rq:WG6sZVjVRSmI4eg5ebrV35ijsdLWBERq
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

asyncrat stormkitty default evasion rat spyware stealer themida trojan

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/bot5980420064:AAHGrlOU2WsgF90Pcyz-L7wrGgC_Cj54k4Q/sendMessage?chat_id=806259874

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

StormKitty payload 2 IoCs

resource	yara_rule
behavioral1/memory/1636-57-0x00000000009C0000-0x00000000011F0000-memory.dmp	family_stormkitty
behavioral1/memory/1636-58-0x00000000009C0000-0x00000000011F0000-memory.dmp	family_stormkitty

Async RAT payload 2 IoCs

rat

resource	yara_rule
behavioral1/memory/1636-57-0x00000000009C0000-0x00000000011F0000-memory.dmp	asyncrat
behavioral1/memory/1636-58-0x00000000009C0000-0x00000000011F0000-memory.dmp	asyncrat

Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 1 IoCs

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	ws.exe

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS 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\SystemBiosVersion	ws.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	ws.exe

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

Themida packer 2 IoCs

Detects Themida, an advanced Windows software protection system.

themida

resource	yara_rule
behavioral1/memory/1636-57-0x00000000009C0000-0x00000000011F0000-memory.dmp	themida
behavioral1/memory/1636-58-0x00000000009C0000-0x00000000011F0000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 1 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	ws.exe

Drops desktop.ini file(s) 6 IoCs

description	ioc	Process
File opened for modification	C:\Users\Admin\AppData\Local\293a7e1c768af32a0f794df82eeb75e2\Admin@VDWSWJJD_en-US\Grabber\DRIVE-C\Users\Admin\Downloads\desktop.ini	ws.exe
File created	C:\Users\Admin\AppData\Local\293a7e1c768af32a0f794df82eeb75e2\Admin@VDWSWJJD_en-US\Grabber\DRIVE-C\Users\Admin\Documents\desktop.ini	ws.exe
File opened for modification	C:\Users\Admin\AppData\Local\293a7e1c768af32a0f794df82eeb75e2\Admin@VDWSWJJD_en-US\Grabber\DRIVE-C\Users\Admin\Documents\desktop.ini	ws.exe
File created	C:\Users\Admin\AppData\Local\293a7e1c768af32a0f794df82eeb75e2\Admin@VDWSWJJD_en-US\Grabber\DRIVE-C\Users\Admin\Desktop\desktop.ini	ws.exe
File created	C:\Users\Admin\AppData\Local\293a7e1c768af32a0f794df82eeb75e2\Admin@VDWSWJJD_en-US\Grabber\DRIVE-C\Users\Admin\Downloads\desktop.ini	ws.exe
File created	C:\Users\Admin\AppData\Local\293a7e1c768af32a0f794df82eeb75e2\Admin@VDWSWJJD_en-US\Grabber\DRIVE-C\Users\Admin\Pictures\desktop.ini	ws.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.

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
1636	ws.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 value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	ws.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\Description\System\CentralProcessor\0	ws.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
1636	ws.exe
1636	ws.exe
1636	ws.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1636	ws.exe

Suspicious use of WriteProcessMemory 28 IoCs

description	pid	Process	procid_target
PID 1636 wrote to memory of 1212	1636	ws.exe	28
PID 1636 wrote to memory of 1212	1636	ws.exe	28
PID 1636 wrote to memory of 1212	1636	ws.exe	28
PID 1636 wrote to memory of 1212	1636	ws.exe	28
PID 1212 wrote to memory of 2040	1212	cmd.exe	30
PID 1212 wrote to memory of 2040	1212	cmd.exe	30
PID 1212 wrote to memory of 2040	1212	cmd.exe	30
PID 1212 wrote to memory of 2040	1212	cmd.exe	30
PID 1212 wrote to memory of 1724	1212	cmd.exe	31
PID 1212 wrote to memory of 1724	1212	cmd.exe	31
PID 1212 wrote to memory of 1724	1212	cmd.exe	31
PID 1212 wrote to memory of 1724	1212	cmd.exe	31
PID 1212 wrote to memory of 1364	1212	cmd.exe	32
PID 1212 wrote to memory of 1364	1212	cmd.exe	32
PID 1212 wrote to memory of 1364	1212	cmd.exe	32
PID 1212 wrote to memory of 1364	1212	cmd.exe	32
PID 1636 wrote to memory of 480	1636	ws.exe	33
PID 1636 wrote to memory of 480	1636	ws.exe	33
PID 1636 wrote to memory of 480	1636	ws.exe	33
PID 1636 wrote to memory of 480	1636	ws.exe	33
PID 480 wrote to memory of 844	480	cmd.exe	35
PID 480 wrote to memory of 844	480	cmd.exe	35
PID 480 wrote to memory of 844	480	cmd.exe	35
PID 480 wrote to memory of 844	480	cmd.exe	35
PID 480 wrote to memory of 936	480	cmd.exe	36
PID 480 wrote to memory of 936	480	cmd.exe	36
PID 480 wrote to memory of 936	480	cmd.exe	36
PID 480 wrote to memory of 936	480	cmd.exe	36

C:\Users\Admin\AppData\Local\Temp\ws.exe
"C:\Users\Admin\AppData\Local\Temp\ws.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Checks whether UAC is enabled
- Drops desktop.ini file(s)
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1636
- C:\Windows\SysWOW64\cmd.exe
  "cmd.exe" /C chcp 65001 && netsh wlan show profile | findstr All
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1212
- - C:\Windows\SysWOW64\chcp.com
    chcp 65001
    3⤵
    PID:2040
- - C:\Windows\SysWOW64\netsh.exe
    netsh wlan show profile
    3⤵
    PID:1724
- - C:\Windows\SysWOW64\findstr.exe
    findstr All
    3⤵
    PID:1364
- C:\Windows\SysWOW64\cmd.exe
  "cmd.exe" /C chcp 65001 && netsh wlan show networks mode=bssid
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:480
- - C:\Windows\SysWOW64\chcp.com
    chcp 65001
    3⤵
    PID:844
- - C:\Windows\SysWOW64\netsh.exe
    netsh wlan show networks mode=bssid
    3⤵
    PID:936

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

T1497

Credential Access

Credentials in Files

T1081

Discovery

Query Registry

T1012

System Information Discovery

T1082

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

memory/1636-61-0x00000000009C0000-0x00000000011F0000-memory.dmp

Download

memory/1636-60-0x0000000077630000-0x00000000777B0000-memory.dmp

Download

memory/1636-54-0x00000000761F1000-0x00000000761F3000-memory.dmp

Download

memory/1636-66-0x0000000004ED5000-0x0000000004EE6000-memory.dmp

Download

memory/1636-59-0x00000000009C0000-0x00000000011F0000-memory.dmp

Download

memory/1636-58-0x00000000009C0000-0x00000000011F0000-memory.dmp

Download

memory/1636-57-0x00000000009C0000-0x00000000011F0000-memory.dmp

Download

memory/1636-72-0x0000000004ED5000-0x0000000004EE6000-memory.dmp

Download