asyncrat | 83d1269b87125006ff08fd7d99a1e5b1fd62e9769848d9912853f4e56cb6ebff

Analysis

max time kernel
61s
max time network
64s
platform
windows11-21h2_x64
resource
win11-20240419-en
resource tags

arch:x64arch:x86image:win11-20240419-enlocale:en-usos:windows11-21h2-x64system
submitted
30-04-2024 19:07

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

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
behavioral3/files/0x001b00000002aafb-12.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
1604	svchost.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 4 IoCs

Web Service

T1102

flow	ioc
11	pastebin.com
1	pastebin.com
5	pastebin.com
9	pastebin.com

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
4928	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1600	timeout.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
4748	VantaFN.exe
4748	VantaFN.exe
4748	VantaFN.exe
4748	VantaFN.exe
4748	VantaFN.exe
4748	VantaFN.exe
4748	VantaFN.exe
4748	VantaFN.exe
4748	VantaFN.exe
4748	VantaFN.exe
4748	VantaFN.exe
4748	VantaFN.exe
4748	VantaFN.exe
4748	VantaFN.exe
4748	VantaFN.exe
4748	VantaFN.exe
4748	VantaFN.exe
4748	VantaFN.exe
4748	VantaFN.exe
4748	VantaFN.exe
4748	VantaFN.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe
1604	svchost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4748	VantaFN.exe
Token: SeDebugPrivilege	1604	svchost.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4748 wrote to memory of 4996	4748	VantaFN.exe	81
PID 4748 wrote to memory of 4996	4748	VantaFN.exe	81
PID 4748 wrote to memory of 2864	4748	VantaFN.exe	83
PID 4748 wrote to memory of 2864	4748	VantaFN.exe	83
PID 2864 wrote to memory of 1600	2864	cmd.exe	86
PID 2864 wrote to memory of 1600	2864	cmd.exe	86
PID 4996 wrote to memory of 4928	4996	cmd.exe	85
PID 4996 wrote to memory of 4928	4996	cmd.exe	85
PID 2864 wrote to memory of 1604	2864	cmd.exe	87
PID 2864 wrote to memory of 1604	2864	cmd.exe	87

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⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4748
- 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:4996
- - 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:4928
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp5F18.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2864
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:1600
- - 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:1604

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\tmp5F18.tmp.bat

Filesize
151B

MD5
1e708fdaf967b7a9978c824256cfcb95

SHA1
f1db65c7368e4d3c7a119af7645b541ee8b31baa

SHA256
fb530f3633f3b35c98f8f256d4b285498024856ee8eed81e626843649dac7492

SHA512
1685bb62e332b1c1dc12f424948f3103be7e2326220ec6795ea596ce1e5b3974789480164406519780b7f2e195ddb54e34d89c6704f22d4ca2252fc6593ba5b3

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

Filesize
3.8MB

MD5
84699018b1132b73d8063290faa07789

SHA1
7d1eec5ae60f0a0383f723f1e001dfc6c2c76aac

SHA256
d35c91227f48c494930749f5486054244686328ad8e02960a6b0b10226bc174c

SHA512
d7d29eaeacb5d4289aa0a3bbdf071f2e875bf307e326829432cfbbcff1b19e3eaccfc81ec5ebcbf2beab7dee8aff05ad8c086ac0e61a0837339f4febabef5ade

Download Submit
memory/4748-0-0x0000000000D30000-0x0000000000D46000-memory.dmp

Filesize
88KB

Download
memory/4748-1-0x00007FFE4DB90000-0x00007FFE4E652000-memory.dmp

Filesize
10.8MB

Download
memory/4748-2-0x000000001BA40000-0x000000001BA50000-memory.dmp

Filesize
64KB

Download
memory/4748-3-0x00007FFE6E9E0000-0x00007FFE6EBE9000-memory.dmp

Filesize
2.0MB

Download
memory/4748-9-0x00007FFE6E9E0000-0x00007FFE6EBE9000-memory.dmp

Filesize
2.0MB

Download
memory/4748-8-0x00007FFE4DB90000-0x00007FFE4E652000-memory.dmp

Filesize
10.8MB

Download