asyncrat | 83d1269b87125006ff08fd7d99a1e5b1fd62e9769848d9912853f4e56cb6ebff

Analysis

max time kernel
150s
max time network
150s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
01-04-2024 14:17

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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
behavioral7/files/0x000e00000001224e-17.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2468	svchost.exe

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

Web Service

T1102

flow	ioc
4	pastebin.com
5	pastebin.com
8	6.tcp.eu.ngrok.io
19	6.tcp.eu.ngrok.io
22	6.tcp.eu.ngrok.io
29	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
2460	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2608	timeout.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
1712	VantaFN.exe
1712	VantaFN.exe
1712	VantaFN.exe
1712	VantaFN.exe
1712	VantaFN.exe
1712	VantaFN.exe
1712	VantaFN.exe
1712	VantaFN.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe
2468	svchost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1712	VantaFN.exe
Token: SeDebugPrivilege	2468	svchost.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1712 wrote to memory of 2548	1712	VantaFN.exe	29
PID 1712 wrote to memory of 2548	1712	VantaFN.exe	29
PID 1712 wrote to memory of 2548	1712	VantaFN.exe	29
PID 1712 wrote to memory of 2724	1712	VantaFN.exe	31
PID 1712 wrote to memory of 2724	1712	VantaFN.exe	31
PID 1712 wrote to memory of 2724	1712	VantaFN.exe	31
PID 2548 wrote to memory of 2460	2548	cmd.exe	33
PID 2548 wrote to memory of 2460	2548	cmd.exe	33
PID 2548 wrote to memory of 2460	2548	cmd.exe	33
PID 2724 wrote to memory of 2608	2724	cmd.exe	34
PID 2724 wrote to memory of 2608	2724	cmd.exe	34
PID 2724 wrote to memory of 2608	2724	cmd.exe	34
PID 2724 wrote to memory of 2468	2724	cmd.exe	35
PID 2724 wrote to memory of 2468	2724	cmd.exe	35
PID 2724 wrote to memory of 2468	2724	cmd.exe	35

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:1712
- 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:2548
- - 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:2460
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp9BA3.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2724
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2608
- - 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:2468

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\LocalLow\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015

Filesize
68KB

MD5
29f65ba8e88c063813cc50a4ea544e93

SHA1
05a7040d5c127e68c25d81cc51271ffb8bef3568

SHA256
1ed81fa8dfb6999a9fedc6e779138ffd99568992e22d300acd181a6d2c8de184

SHA512
e29b2e92c496245bed3372578074407e8ef8882906ce10c35b3c8deebfefe01b5fd7f3030acaa693e175f4b7aca6cd7d8d10ae1c731b09c5fa19035e005de3aa

Download Submit
C:\Users\Admin\AppData\Local\Temp\TarC318.tmp

Filesize
177KB

MD5
435a9ac180383f9fa094131b173a2f7b

SHA1
76944ea657a9db94f9a4bef38f88c46ed4166983

SHA256
67dc37ed50b8e63272b49a254a6039ee225974f1d767bb83eb1fd80e759a7c34

SHA512
1a6b277611959720a9c71114957620517ad94541302f164eb872bd322292a952409bafb8bc2ac793b16ad5f25d83f8594ccff2b7834e3c2b2b941e6fc84c009a

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp9BA3.tmp.bat

Filesize
151B

MD5
516d2038e8984a9cc7ceaf28b8984d37

SHA1
9b34c7e1da055c0712a2474676ab77408123d4c7

SHA256
ba2b1856344fb6c8898a9d33f32109d03b877bb3c047d6aa2312ea1b0da91dc3

SHA512
1827c557d9e7afe788228a8426598741488ea0b60f3fad593855fbb55f70920240f2bd02c25fd20c2223ce99f23d6840f6905a0fa981239d595dd03ce207d87e

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

Filesize
3.8MB

MD5
84699018b1132b73d8063290faa07789

SHA1
7d1eec5ae60f0a0383f723f1e001dfc6c2c76aac

SHA256
d35c91227f48c494930749f5486054244686328ad8e02960a6b0b10226bc174c

SHA512
d7d29eaeacb5d4289aa0a3bbdf071f2e875bf307e326829432cfbbcff1b19e3eaccfc81ec5ebcbf2beab7dee8aff05ad8c086ac0e61a0837339f4febabef5ade

Download Submit
memory/1712-2-0x000000001B160000-0x000000001B1E0000-memory.dmp

Filesize
512KB

Download
memory/1712-12-0x000007FEF5780000-0x000007FEF616C000-memory.dmp

Filesize
9.9MB

Download
memory/1712-14-0x00000000773E0000-0x0000000077589000-memory.dmp

Filesize
1.7MB

Download
memory/1712-0-0x0000000000E90000-0x0000000000EA6000-memory.dmp

Filesize
88KB

Download
memory/1712-3-0x00000000773E0000-0x0000000077589000-memory.dmp

Filesize
1.7MB

Download
memory/1712-1-0x000007FEF5780000-0x000007FEF616C000-memory.dmp

Filesize
9.9MB

Download
memory/2468-18-0x0000000000C50000-0x0000000000C66000-memory.dmp

Filesize
88KB

Download
memory/2468-19-0x000007FEF4D90000-0x000007FEF577C000-memory.dmp

Filesize
9.9MB

Download
memory/2468-20-0x000000001B110000-0x000000001B190000-memory.dmp

Filesize
512KB

Download
memory/2468-21-0x00000000773E0000-0x0000000077589000-memory.dmp

Filesize
1.7MB

Download
memory/2468-59-0x000007FEF4D90000-0x000007FEF577C000-memory.dmp

Filesize
9.9MB

Download
memory/2468-60-0x000000001B110000-0x000000001B190000-memory.dmp

Filesize
512KB

Download
memory/2468-61-0x00000000773E0000-0x0000000077589000-memory.dmp

Filesize
1.7MB

Download