asyncrat | 83d1269b87125006ff08fd7d99a1e5b1fd62e9769848d9912853f4e56cb6ebff

Analysis

max time kernel
150s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
07-04-2024 17:57

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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
behavioral5/files/0x000800000002320a-12.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-1-5-21-1497073144-2389943819-3385106915-1000\Control Panel\International\Geo\Nation	VantaFN.exe

Executes dropped EXE 1 IoCs

pid	Process
3440	svchost.exe

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

Web Service

T1102

flow	ioc
21	pastebin.com
22	pastebin.com
23	0.tcp.eu.ngrok.io
74	0.tcp.eu.ngrok.io
77	0.tcp.eu.ngrok.io
96	0.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
2108	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3204	timeout.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
3732	VantaFN.exe
3732	VantaFN.exe
3732	VantaFN.exe
3732	VantaFN.exe
3732	VantaFN.exe
3732	VantaFN.exe
3732	VantaFN.exe
3732	VantaFN.exe
3732	VantaFN.exe
3732	VantaFN.exe
3732	VantaFN.exe
3732	VantaFN.exe
3732	VantaFN.exe
3732	VantaFN.exe
3732	VantaFN.exe
3732	VantaFN.exe
3732	VantaFN.exe
3732	VantaFN.exe
3732	VantaFN.exe
3732	VantaFN.exe
3732	VantaFN.exe
3732	VantaFN.exe
3732	VantaFN.exe
3732	VantaFN.exe
3732	VantaFN.exe
3732	VantaFN.exe
3732	VantaFN.exe
3732	VantaFN.exe
3732	VantaFN.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe
3440	svchost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3732	VantaFN.exe
Token: SeDebugPrivilege	3440	svchost.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 3732 wrote to memory of 4968	3732	VantaFN.exe	85
PID 3732 wrote to memory of 4968	3732	VantaFN.exe	85
PID 3732 wrote to memory of 4744	3732	VantaFN.exe	87
PID 3732 wrote to memory of 4744	3732	VantaFN.exe	87
PID 4744 wrote to memory of 3204	4744	cmd.exe	89
PID 4744 wrote to memory of 3204	4744	cmd.exe	89
PID 4968 wrote to memory of 2108	4968	cmd.exe	90
PID 4968 wrote to memory of 2108	4968	cmd.exe	90
PID 4744 wrote to memory of 3440	4744	cmd.exe	93
PID 4744 wrote to memory of 3440	4744	cmd.exe	93

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:3732
- 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:4968
- - 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:2108
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp5B8D.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4744
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:3204
- - 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:3440

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp5B8D.tmp.bat

Filesize
151B

MD5
ceb5679f9fb99301621dcd7778b347c6

SHA1
f2231ac864a97704f55a0eb85db873d2fdd48ff7

SHA256
0fbabb8cb511297194217b5fa2b246b0ce6653a656adf4025d1c2024262905cb

SHA512
3802bbc49742504a9fe17df1a3b9756006df3e5da476df5e606129b404df3d500151140f9e2c2fd936b766770291fb6b9f0126550abc6f2ae1f646b8aba75f32

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

Filesize
3.8MB

MD5
84699018b1132b73d8063290faa07789

SHA1
7d1eec5ae60f0a0383f723f1e001dfc6c2c76aac

SHA256
d35c91227f48c494930749f5486054244686328ad8e02960a6b0b10226bc174c

SHA512
d7d29eaeacb5d4289aa0a3bbdf071f2e875bf307e326829432cfbbcff1b19e3eaccfc81ec5ebcbf2beab7dee8aff05ad8c086ac0e61a0837339f4febabef5ade

Download Submit
memory/3440-14-0x00007FFBC4850000-0x00007FFBC5311000-memory.dmp

Filesize
10.8MB

Download
memory/3440-15-0x00007FFBE28D0000-0x00007FFBE2AC5000-memory.dmp

Filesize
2.0MB

Download
memory/3440-16-0x00007FFBC4850000-0x00007FFBC5311000-memory.dmp

Filesize
10.8MB

Download
memory/3440-17-0x00007FFBE28D0000-0x00007FFBE2AC5000-memory.dmp

Filesize
2.0MB

Download
memory/3732-0-0x00000000009D0000-0x00000000009E6000-memory.dmp

Filesize
88KB

Download
memory/3732-1-0x00007FFBC4850000-0x00007FFBC5311000-memory.dmp

Filesize
10.8MB

Download
memory/3732-2-0x000000001B680000-0x000000001B690000-memory.dmp

Filesize
64KB

Download
memory/3732-7-0x00007FFBE28D0000-0x00007FFBE2AC5000-memory.dmp

Filesize
2.0MB

Download
memory/3732-8-0x00007FFBD2FE0000-0x00007FFBD2FF9000-memory.dmp

Filesize
100KB

Download
memory/3732-9-0x00007FFBC4850000-0x00007FFBC5311000-memory.dmp

Filesize
10.8MB

Download