asyncrat | 9fde4361d7beadb8c11afed5b0518211740cef76ea03146e98a8337581e02f7e

Resubmissions

11-08-2024 01:31

240811-bxn8dsydpp 10

11-08-2024 01:29

240811-bwl2mssgld 10

Analysis

max time kernel
28s
max time network
35s
platform
windows7_x64
resource
win7-20240704-en
resource tags

arch:x64arch:x86image:win7-20240704-enlocale:en-usos:windows7-x64system
submitted
11-08-2024 01:31

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General

Target

buidl.exe
Size

63KB
MD5

9c2d4871014553f542534fce03805000
SHA1

cd44e0ee979718203d896fcc7dcb5cc5077eb721
SHA256

9fde4361d7beadb8c11afed5b0518211740cef76ea03146e98a8337581e02f7e
SHA512

7d15b22083a0132440297035e5854b318e2aadc615c7959285bc8516292b19f7cd1b062350bde02397e562952ec0910100c4988bec2d92b4ca394b76b1bb7442
SSDEEP

768:PHDvlKazXYN78NwC8A+XuqazcBRL5JTk1+T4KSBGHmDbD/ph0oXOlKYsN3tlSusV:btTXA9dSJYUbdh9OlAF+usdpqKmY7

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Botnet

Default

Attributes

delay
1
install
true
install_file
Discord.exe
install_folder
%AppData%
pastebin_config
https://pastebin.com/raw/zs3YKzJ3

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
behavioral1/files/0x000b000000016d58-15.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2588	Discord.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
5	pastebin.com
4	pastebin.com

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

System Information Discovery
T1082

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2772	timeout.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2672	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2816	buidl.exe
2816	buidl.exe
2816	buidl.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2816	buidl.exe
Token: SeDebugPrivilege	2588	Discord.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2816 wrote to memory of 2800	2816	buidl.exe	30
PID 2816 wrote to memory of 2800	2816	buidl.exe	30
PID 2816 wrote to memory of 2800	2816	buidl.exe	30
PID 2816 wrote to memory of 2952	2816	buidl.exe	32
PID 2816 wrote to memory of 2952	2816	buidl.exe	32
PID 2816 wrote to memory of 2952	2816	buidl.exe	32
PID 2800 wrote to memory of 2672	2800	cmd.exe	34
PID 2800 wrote to memory of 2672	2800	cmd.exe	34
PID 2800 wrote to memory of 2672	2800	cmd.exe	34
PID 2952 wrote to memory of 2772	2952	cmd.exe	35
PID 2952 wrote to memory of 2772	2952	cmd.exe	35
PID 2952 wrote to memory of 2772	2952	cmd.exe	35
PID 2952 wrote to memory of 2588	2952	cmd.exe	36
PID 2952 wrote to memory of 2588	2952	cmd.exe	36
PID 2952 wrote to memory of 2588	2952	cmd.exe	36

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\buidl.exe
"C:\Users\Admin\AppData\Local\Temp\buidl.exe"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2816
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Discord" /tr '"C:\Users\Admin\AppData\Roaming\Discord.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2800
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "Discord" /tr '"C:\Users\Admin\AppData\Roaming\Discord.exe"'
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2672
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp75CC.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2952
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2772
- - C:\Users\Admin\AppData\Roaming\Discord.exe
    "C:\Users\Admin\AppData\Roaming\Discord.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:2588

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

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\tmp75CC.tmp.bat

Filesize
151B

MD5
5ae183ee4873935aaae7413667760854

SHA1
1bcfaff1645d3de7bbcb0a08ccabdd6f45adde49

SHA256
acdc501d2a3e23233f6a45514423043909a9d599ca976c8da2ec6a321d7e5db7

SHA512
4a6f2387140da43bfe39f8ecc12a61a82899f7bec6b422100b4b29165a97e5bae2ba06868d3016196239684e1c1df060f9330ec4e3453bac73c99f5485953ee8

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

Filesize
63KB

MD5
9c2d4871014553f542534fce03805000

SHA1
cd44e0ee979718203d896fcc7dcb5cc5077eb721

SHA256
9fde4361d7beadb8c11afed5b0518211740cef76ea03146e98a8337581e02f7e

SHA512
7d15b22083a0132440297035e5854b318e2aadc615c7959285bc8516292b19f7cd1b062350bde02397e562952ec0910100c4988bec2d92b4ca394b76b1bb7442

Download Submit
memory/2588-17-0x00000000010C0000-0x00000000010D6000-memory.dmp

Filesize
88KB

Download
memory/2816-0-0x000007FEF5703000-0x000007FEF5704000-memory.dmp

Filesize
4KB

Download
memory/2816-1-0x0000000001060000-0x0000000001076000-memory.dmp

Filesize
88KB

Download
memory/2816-2-0x000007FEF5700000-0x000007FEF60EC000-memory.dmp

Filesize
9.9MB

Download
memory/2816-3-0x000007FEF5700000-0x000007FEF60EC000-memory.dmp

Filesize
9.9MB

Download
memory/2816-13-0x000007FEF5700000-0x000007FEF60EC000-memory.dmp

Filesize
9.9MB

Download