asyncrat | 92ab9ed68950db61024eb5c5180f0019281a3bec96cd5a2f7305f450de064d4f | Triage

Analysis

max time kernel
290s
max time network
298s
platform
windows10-1703_x64
resource
win10-20240404-en
resource tags

arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
submitted
31/05/2024, 04:12

Sharing

Report Analysis Logs

General

Target

System.exe
Size

3.4MB
MD5

fb19368b80bb083a67bea154f2e7f4a6
SHA1

7bb20b8ee40c9f94dd77b8cd35920b1ba651ae86
SHA256

92ab9ed68950db61024eb5c5180f0019281a3bec96cd5a2f7305f450de064d4f
SHA512

9fc041c4404602469314cf29cdae55d720bb26e8b37d774b13f7483a160c7fd0daea8d6274e7113a2c524630bf90d3b04513d04e19fe3f9cb216b44502f7c4f2
SSDEEP

49152:OnT6jNyvZdHzYjd3deChH/GBtNNwxry+3u1IRgQo37xcoMuFVhDb5Xqx:fQZdHod3ACBGBX+HgQvwV56x

Score

10^/10

asyncrat stormkitty default discovery evasion rat spyware stealer themida trojan

Malware Config

Extracted

Family

asyncrat

Version

Venom RAT + HVNC + Stealer + Grabber v6.5

Botnet

Default

Mutex

umldzqgmsvrmiibib

Attributes

c2_url_file
https://paste.fo/raw/53957c5e1888
delay
1
install
true
install_file
Registry.exe
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
behavioral1/memory/1608-27-0x0000000007E90000-0x0000000007FB2000-memory.dmp	family_stormkitty

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

Query Registry

Virtualization/Sandbox Evasion

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

Checks BIOS information in registry 2 TTPs 2 IoCs

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

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	System.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	System.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
T1552.001

Themida packer 2 IoCs

Detects Themida, an advanced Windows software protection system.

resource	yara_rule
behavioral1/memory/1608-11-0x00000000001F0000-0x0000000000B10000-memory.dmp	themida
behavioral1/memory/1608-12-0x00000000001F0000-0x0000000000B10000-memory.dmp	themida

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Checks whether UAC is enabled 1 TTPs 1 IoCs

System Information Discovery

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

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
1608	System.exe

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

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1456	1608	WerFault.exe	72

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

Scheduled Task/Job

pid	Process
320	schtasks.exe

Suspicious behavior: EnumeratesProcesses 18 IoCs

pid	Process
1608	System.exe
1608	System.exe
1608	System.exe
1608	System.exe
1608	System.exe
1608	System.exe
1608	System.exe
1608	System.exe
1608	System.exe
1608	System.exe
1608	System.exe
1608	System.exe
1608	System.exe
1608	System.exe
1608	System.exe
1608	System.exe
1608	System.exe
1608	System.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1608	System.exe
Token: SeDebugPrivilege	1608	System.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1608	System.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1608 wrote to memory of 4716	1608	System.exe	73
PID 1608 wrote to memory of 4716	1608	System.exe	73
PID 1608 wrote to memory of 4716	1608	System.exe	73
PID 4716 wrote to memory of 320	4716	cmd.exe	75
PID 4716 wrote to memory of 320	4716	cmd.exe	75
PID 4716 wrote to memory of 320	4716	cmd.exe	75

C:\Users\Admin\AppData\Local\Temp\System.exe
"C:\Users\Admin\AppData\Local\Temp\System.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1608
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Registry" /tr '"C:\Users\Admin\AppData\Roaming\Registry.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4716
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "Registry" /tr '"C:\Users\Admin\AppData\Roaming\Registry.exe"'
    3⤵
    - Creates scheduled task(s)
    PID:320
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1608 -s 2944
  2⤵
  - Program crash
  PID:1456

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

Persistence

Scheduled Task/Job

Privilege Escalation

Scheduled Task/Job

Defense Evasion

Virtualization/Sandbox Evasion

Credential Access

Unsecured Credentials

Credentials In Files

Discovery

Query Registry

System Information Discovery

Virtualization/Sandbox Evasion

Lateral Movement

Collection

Data from Local System

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

memory/1608-0-0x00000000001F0000-0x0000000000B10000-memory.dmp

Filesize
9.1MB

Download
memory/1608-1-0x0000000076BB6000-0x0000000076BB7000-memory.dmp

Filesize
4KB

Download
memory/1608-2-0x0000000076AC0000-0x0000000076C82000-memory.dmp

Filesize
1.8MB

Download
memory/1608-5-0x0000000076AC0000-0x0000000076C82000-memory.dmp

Filesize
1.8MB

Download
memory/1608-7-0x0000000076AC0000-0x0000000076C82000-memory.dmp

Filesize
1.8MB

Download
memory/1608-6-0x0000000076AC0000-0x0000000076C82000-memory.dmp

Filesize
1.8MB

Download
memory/1608-4-0x0000000076AC0000-0x0000000076C82000-memory.dmp

Filesize
1.8MB

Download
memory/1608-3-0x0000000076AC0000-0x0000000076C82000-memory.dmp

Filesize
1.8MB

Download
memory/1608-10-0x0000000076AC0000-0x0000000076C82000-memory.dmp

Filesize
1.8MB

Download
memory/1608-11-0x00000000001F0000-0x0000000000B10000-memory.dmp

Filesize
9.1MB

Download
memory/1608-12-0x00000000001F0000-0x0000000000B10000-memory.dmp

Filesize
9.1MB

Download
memory/1608-13-0x0000000005CF0000-0x00000000061EE000-memory.dmp

Filesize
5.0MB

Download
memory/1608-15-0x0000000006B90000-0x0000000006C22000-memory.dmp

Filesize
584KB

Download
memory/1608-16-0x0000000006F70000-0x0000000006F7A000-memory.dmp

Filesize
40KB

Download
memory/1608-20-0x0000000007580000-0x00000000075E6000-memory.dmp

Filesize
408KB

Download
memory/1608-19-0x00000000071A0000-0x000000000723C000-memory.dmp

Filesize
624KB

Download
memory/1608-21-0x0000000076AC0000-0x0000000076C82000-memory.dmp

Filesize
1.8MB

Download
memory/1608-24-0x00000000001F0000-0x0000000000B10000-memory.dmp

Filesize
9.1MB

Download
memory/1608-25-0x0000000076BB6000-0x0000000076BB7000-memory.dmp

Filesize
4KB

Download
memory/1608-26-0x0000000007E10000-0x0000000007E86000-memory.dmp

Filesize
472KB

Download
memory/1608-27-0x0000000007E90000-0x0000000007FB2000-memory.dmp

Filesize
1.1MB

Download
memory/1608-28-0x0000000007DF0000-0x0000000007E0E000-memory.dmp

Filesize
120KB

Download
memory/1608-52-0x0000000008280000-0x00000000085D0000-memory.dmp

Filesize
3.3MB

Download
memory/1608-53-0x0000000007CB0000-0x0000000007CFB000-memory.dmp

Filesize
300KB

Download
memory/1608-54-0x0000000076AC0000-0x0000000076C82000-memory.dmp

Filesize
1.8MB

Download