asyncrat | 83d1269b87125006ff08fd7d99a1e5b1fd62e9769848d9912853f4e56cb6ebff

Analysis

max time kernel
150s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
01-04-2024 14:17

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

VantaFN.exe
Size

3.8MB
MD5

84699018b1132b73d8063290faa07789
SHA1

7d1eec5ae60f0a0383f723f1e001dfc6c2c76aac
SHA256

d35c91227f48c494930749f5486054244686328ad8e02960a6b0b10226bc174c
SHA512

d7d29eaeacb5d4289aa0a3bbdf071f2e875bf307e326829432cfbbcff1b19e3eaccfc81ec5ebcbf2beab7dee8aff05ad8c086ac0e61a0837339f4febabef5ade
SSDEEP

1536:ftTXAtyLaVfblJpAGUbVh9CU5uodpqKmY7:fWyaVPaGUbVjzGz

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Botnet

Default

Mutex

Δ2cΕmVO比L西IVurs诶Eש8

Attributes

delay
1
install
true
install_file
svchost.exe
install_folder
%AppData%
pastebin_config
https://pastebin.com/raw/z5PQ82wE

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral8/files/0x000300000002276e-13.dat	family_asyncrat

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-1-5-21-983155329-280873152-1838004294-1000\Control Panel\International\Geo\Nation	VantaFN.exe

Executes dropped EXE 1 IoCs

pid	Process
4536	svchost.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 6 IoCs

Web Service

T1102

flow	ioc
13	pastebin.com
14	pastebin.com
16	6.tcp.eu.ngrok.io
26	6.tcp.eu.ngrok.io
49	6.tcp.eu.ngrok.io
65	6.tcp.eu.ngrok.io

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
332	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
4548	timeout.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
2748	VantaFN.exe
2748	VantaFN.exe
2748	VantaFN.exe
2748	VantaFN.exe
2748	VantaFN.exe
2748	VantaFN.exe
2748	VantaFN.exe
2748	VantaFN.exe
2748	VantaFN.exe
2748	VantaFN.exe
2748	VantaFN.exe
2748	VantaFN.exe
2748	VantaFN.exe
2748	VantaFN.exe
2748	VantaFN.exe
2748	VantaFN.exe
2748	VantaFN.exe
2748	VantaFN.exe
2748	VantaFN.exe
2748	VantaFN.exe
2748	VantaFN.exe
2748	VantaFN.exe
2748	VantaFN.exe
2748	VantaFN.exe
2748	VantaFN.exe
2748	VantaFN.exe
2748	VantaFN.exe
2748	VantaFN.exe
2748	VantaFN.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe
4536	svchost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2748	VantaFN.exe
Token: SeDebugPrivilege	4536	svchost.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2748 wrote to memory of 3512	2748	VantaFN.exe	90
PID 2748 wrote to memory of 3512	2748	VantaFN.exe	90
PID 2748 wrote to memory of 1132	2748	VantaFN.exe	92
PID 2748 wrote to memory of 1132	2748	VantaFN.exe	92
PID 1132 wrote to memory of 4548	1132	cmd.exe	94
PID 1132 wrote to memory of 4548	1132	cmd.exe	94
PID 3512 wrote to memory of 332	3512	cmd.exe	95
PID 3512 wrote to memory of 332	3512	cmd.exe	95
PID 1132 wrote to memory of 4536	1132	cmd.exe	99
PID 1132 wrote to memory of 4536	1132	cmd.exe	99

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\VantaFN.exe
"C:\Users\Admin\AppData\Local\Temp\VantaFN.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2748
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3512
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"'
    3⤵
    - Creates scheduled task(s)
    PID:332
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp59A9.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1132
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:4548
- - C:\Users\Admin\AppData\Roaming\svchost.exe
    "C:\Users\Admin\AppData\Roaming\svchost.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4536

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\tmp59A9.tmp.bat

Filesize
151B

MD5
f9077c4b000f13e0a48039fd1bbafe03

SHA1
0b490e13c1764349799184809e38c46027286170

SHA256
a12ce1372b02b267ddaa981256140c6dd0dc1aa24bf2ae2a47c81d7d80fe1a86

SHA512
02d5a9f83ecbd8be5d9f95bd098a96c265b8c12101e03334e08ce85231a95783f8e48c2c5382e5ace075414c2582e712b9645b2bc005b805dea1c1847c8a8224

Download Submit
C:\Users\Admin\AppData\Roaming\svchost.exe

Filesize
3.8MB

MD5
84699018b1132b73d8063290faa07789

SHA1
7d1eec5ae60f0a0383f723f1e001dfc6c2c76aac

SHA256
d35c91227f48c494930749f5486054244686328ad8e02960a6b0b10226bc174c

SHA512
d7d29eaeacb5d4289aa0a3bbdf071f2e875bf307e326829432cfbbcff1b19e3eaccfc81ec5ebcbf2beab7dee8aff05ad8c086ac0e61a0837339f4febabef5ade

Download Submit
memory/2748-10-0x00007FFC3C150000-0x00007FFC3C345000-memory.dmp

Filesize
2.0MB

Download
memory/2748-7-0x00007FFC3C150000-0x00007FFC3C345000-memory.dmp

Filesize
2.0MB

Download
memory/2748-8-0x00007FFC2BC90000-0x00007FFC2BCA9000-memory.dmp

Filesize
100KB

Download
memory/2748-9-0x00007FFC1E080000-0x00007FFC1EB41000-memory.dmp

Filesize
10.8MB

Download
memory/2748-0-0x0000000000ED0000-0x0000000000EE6000-memory.dmp

Filesize
88KB

Download
memory/2748-2-0x000000001BBF0000-0x000000001BC00000-memory.dmp

Filesize
64KB

Download
memory/2748-1-0x00007FFC1E080000-0x00007FFC1EB41000-memory.dmp

Filesize
10.8MB

Download
memory/4536-15-0x00007FFC1DC10000-0x00007FFC1E6D1000-memory.dmp

Filesize
10.8MB

Download
memory/4536-16-0x00007FFC3C150000-0x00007FFC3C345000-memory.dmp

Filesize
2.0MB

Download
memory/4536-17-0x00007FFC1DC10000-0x00007FFC1E6D1000-memory.dmp

Filesize
10.8MB

Download
memory/4536-18-0x00007FFC3C150000-0x00007FFC3C345000-memory.dmp

Filesize
2.0MB

Download