asyncrat | 92ab9ed68950db61024eb5c5180f0019281a3bec96cd5a2f7305f450de064d4f | Triage

Analysis

max time kernel
290s
max time network
254s
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 collection 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
behavioral3/memory/4420-23-0x0000000008060000-0x0000000008182000-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
behavioral3/memory/4420-4-0x00000000012B0000-0x0000000001BD0000-memory.dmp	themida
behavioral3/memory/4420-5-0x00000000012B0000-0x0000000001BD0000-memory.dmp	themida

Accesses Microsoft Outlook profiles 1 TTPs 1 IoCs

Email Collection

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-873560699-1074803302-2326074425-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	System.exe

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
4420	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
4348	4420	WerFault.exe	74

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
5072	schtasks.exe

Suspicious behavior: EnumeratesProcesses 20 IoCs

pid	Process
4420	System.exe
4420	System.exe
4420	System.exe
4420	System.exe
4420	System.exe
4420	System.exe
4420	System.exe
4420	System.exe
4420	System.exe
4420	System.exe
4420	System.exe
4420	System.exe
4420	System.exe
4420	System.exe
4420	System.exe
4420	System.exe
4420	System.exe
4420	System.exe
4420	System.exe
4420	System.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4420	System.exe
Token: SeDebugPrivilege	4420	System.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4420	System.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4420 wrote to memory of 1396	4420	System.exe	75
PID 4420 wrote to memory of 1396	4420	System.exe	75
PID 4420 wrote to memory of 1396	4420	System.exe	75
PID 1396 wrote to memory of 5072	1396	cmd.exe	77
PID 1396 wrote to memory of 5072	1396	cmd.exe	77
PID 1396 wrote to memory of 5072	1396	cmd.exe	77

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-873560699-1074803302-2326074425-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	System.exe

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
- Accesses Microsoft Outlook profiles
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
- outlook_office_path
PID:4420
- 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:1396
- - 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:5072
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4420 -s 2944
  2⤵
  - Program crash
  PID:4348

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

Email Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\tmpE3FE.tmp.dat

Filesize
92KB

MD5
cae9079afcb4c379869afa5d34181d8a

SHA1
188e2435c533dd9633f5fcc09f245ddc1a78db2c

SHA256
2be0a96da90da69fbc34b8e7747e89ce57dfc4fb58ed6c79e0fc21cb7c6791b7

SHA512
ff7d863ebd1090219f07eaf2ac493f20b6ed11606e7f2c19536d764e730a8bb426fff26dc3890f0503c12329ea4a6c5d8812a0d1b69c19a29fbb8cb8366bd4fd

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpE411.tmp.dat

Filesize
148KB

MD5
90a1d4b55edf36fa8b4cc6974ed7d4c4

SHA1
aba1b8d0e05421e7df5982899f626211c3c4b5c1

SHA256
7cf3e9e8619904e72ea6608cc43e9b6c9f8aa2af02476f60c2b3daf33075981c

SHA512
ea0838be754e1258c230111900c5937d2b0788f90bbf7c5f82b2ceda7868e50afb86c301f313267eaa912778da45755560b5434885521bf915967a7863922ae2

Download Submit
memory/4420-17-0x00000000012B0000-0x0000000001BD0000-memory.dmp

Filesize
9.1MB

Download
memory/4420-18-0x0000000007AC0000-0x0000000007B36000-memory.dmp

Filesize
472KB

Download
memory/4420-6-0x0000000005C70000-0x000000000616E000-memory.dmp

Filesize
5.0MB

Download
memory/4420-8-0x0000000006790000-0x0000000006822000-memory.dmp

Filesize
584KB

Download
memory/4420-9-0x0000000006770000-0x000000000677A000-memory.dmp

Filesize
40KB

Download
memory/4420-12-0x0000000006FE0000-0x000000000707C000-memory.dmp

Filesize
624KB

Download
memory/4420-13-0x0000000006D50000-0x0000000006DB6000-memory.dmp

Filesize
408KB

Download
memory/4420-14-0x00007FF8D8220000-0x00007FF8D83FB000-memory.dmp

Filesize
1.9MB

Download
memory/4420-0-0x00000000012B0000-0x0000000001BD0000-memory.dmp

Filesize
9.1MB

Download
memory/4420-5-0x00000000012B0000-0x0000000001BD0000-memory.dmp

Filesize
9.1MB

Download
memory/4420-19-0x0000000007C40000-0x0000000007D74000-memory.dmp

Filesize
1.2MB

Download
memory/4420-20-0x0000000007D70000-0x0000000007D8E000-memory.dmp

Filesize
120KB

Download
memory/4420-21-0x0000000007DB0000-0x0000000007DBA000-memory.dmp

Filesize
40KB

Download
memory/4420-23-0x0000000008060000-0x0000000008182000-memory.dmp

Filesize
1.1MB

Download
memory/4420-47-0x0000000009530000-0x0000000009880000-memory.dmp

Filesize
3.3MB

Download
memory/4420-48-0x0000000007960000-0x00000000079AB000-memory.dmp

Filesize
300KB

Download
memory/4420-4-0x00000000012B0000-0x0000000001BD0000-memory.dmp

Filesize
9.1MB

Download
memory/4420-1-0x00007FF8D8220000-0x00007FF8D83FB000-memory.dmp

Filesize
1.9MB

Download