asyncrat | 7559e6ca8b77400f88bf4e67208a1c32570a670068eccae9e3d226cc5471bd47

Analysis

max time kernel
149s
max time network
151s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
17-09-2024 06:30

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General

Target

bazaar.2020.02/HEUR-Backdoor.MSIL.Crysan.exe
Size

46KB
MD5

b36ed4b297c327eb67746e85fe4434f4
SHA1

7f24843a465e1e811b82a79ced5b071f7350155b
SHA256

0a276fdaf3367ca3fd4cf90eb338dd3d0575ba3979f1bd609ce58e13e2aa0a8e
SHA512

d7002fcabec0e34f5200df23e1ba2b9b840ed502f7b22da9c231613092aa853d8fa1b76b6e934947c13ffbfab5ba49be1c057944c726f9b9cb565470c22c2cbf
SSDEEP

768:YCqJlzbXvMdSXekOicvHk3eHlWMPbPgF0qV1ZGF4G1Pc1pBSDHLw5YI6OC22tYch:YCjCeXvZH0ub4Fr/ZUdW1/uHL06O7Kme

Score

10^/10

asyncrat null rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.6A

Botnet

null

bomi.duckdns.org:8080

Mutex

hutqlynrbwzq

Attributes

delay
5
install
true
install_file
Boomi.exe
install_folder
%AppData%

aes.plain

Signatures

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

Executes dropped EXE 1 IoCs

pid	Process
2584	Boomi.exe

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
1880	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
1852	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
1820	HEUR-Backdoor.MSIL.Crysan.exe
1820	HEUR-Backdoor.MSIL.Crysan.exe
2584	Boomi.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1820	HEUR-Backdoor.MSIL.Crysan.exe
Token: SeDebugPrivilege	2584	Boomi.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 1820 wrote to memory of 1852	1820	HEUR-Backdoor.MSIL.Crysan.exe	28
PID 1820 wrote to memory of 1852	1820	HEUR-Backdoor.MSIL.Crysan.exe	28
PID 1820 wrote to memory of 1852	1820	HEUR-Backdoor.MSIL.Crysan.exe	28
PID 1820 wrote to memory of 2308	1820	HEUR-Backdoor.MSIL.Crysan.exe	32
PID 1820 wrote to memory of 2308	1820	HEUR-Backdoor.MSIL.Crysan.exe	32
PID 1820 wrote to memory of 2308	1820	HEUR-Backdoor.MSIL.Crysan.exe	32
PID 2308 wrote to memory of 1880	2308	cmd.exe	34
PID 2308 wrote to memory of 1880	2308	cmd.exe	34
PID 2308 wrote to memory of 1880	2308	cmd.exe	34
PID 2308 wrote to memory of 2584	2308	cmd.exe	35
PID 2308 wrote to memory of 2584	2308	cmd.exe	35
PID 2308 wrote to memory of 2584	2308	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\bazaar.2020.02\HEUR-Backdoor.MSIL.Crysan.exe
"C:\Users\Admin\AppData\Local\Temp\bazaar.2020.02\HEUR-Backdoor.MSIL.Crysan.exe"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1820
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /sc ONLOGON /RL HIGHEST /tn "'Boomi"' /tr "'C:\Users\Admin\AppData\Roaming\Boomi.exe"'
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1852
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpCCB1.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2308
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:1880
- - C:\Users\Admin\AppData\Roaming\Boomi.exe
    "C:\Users\Admin\AppData\Roaming\Boomi.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2584

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

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpCCB1.tmp.bat

Filesize
149B

MD5
a8e981c8a7221f7c63256f84f22352ac

SHA1
631d83af08978d5b0c957d63e14832caf953e24f

SHA256
7d95933178e4cc69aad1918f3fcc43d337878fc8a8cfa415d71c2e58f40d6b5b

SHA512
bd10d71c8b12e178dac756bd6e39dce043c7652887b3d271efaccd57e4901658eae75a8162ea269b5d6ae0f8079d02a8a8a7d50e00e66d7d0d09ea64523fb432

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

Filesize
39.2MB

MD5
7b4fa806c60690b0c35dd26ba155ebe6

SHA1
254ac9db3d28ee835a9602a400fa4230157e91e7

SHA256
76510d5c41152b194866a2b641dd2465e56d6a66893f490970dd07668cb16784

SHA512
56f06e11e068cb1018b138a0d84eb1ee46b148f17d7db8fea6f95a3d4238c5f42593c41277036f546a4eec8f5dfc6e4a4163fb7fc5f8485040c02404caeaed0f

Download Submit
memory/1820-0-0x000007FEF5CC3000-0x000007FEF5CC4000-memory.dmp

Filesize
4KB

Download
memory/1820-1-0x0000000000C90000-0x0000000000CA2000-memory.dmp

Filesize
72KB

Download
memory/1820-2-0x000007FEF5CC0000-0x000007FEF66AC000-memory.dmp

Filesize
9.9MB

Download
memory/1820-3-0x000007FEF5CC3000-0x000007FEF5CC4000-memory.dmp

Filesize
4KB

Download
memory/1820-4-0x000007FEF5CC0000-0x000007FEF66AC000-memory.dmp

Filesize
9.9MB

Download
memory/1820-14-0x000007FEF5CC0000-0x000007FEF66AC000-memory.dmp

Filesize
9.9MB

Download
memory/2584-18-0x0000000000330000-0x0000000000342000-memory.dmp

Filesize
72KB

Download