asyncrat | 7559e6ca8b77400f88bf4e67208a1c32570a670068eccae9e3d226cc5471bd47

Resubmissions

26-09-2024 06:42

240926-hgnp9ashkk 10

25-09-2024 16:40

240925-t6kwfayfph 10

Analysis

max time kernel
149s
max time network
156s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
25-09-2024 16:40

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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
892	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
3032	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
2804	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2560	HEUR-Backdoor.MSIL.Crysan.exe
2560	HEUR-Backdoor.MSIL.Crysan.exe
2560	HEUR-Backdoor.MSIL.Crysan.exe
892	Boomi.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2560	HEUR-Backdoor.MSIL.Crysan.exe
Token: SeDebugPrivilege	892	Boomi.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 2560 wrote to memory of 2804	2560	HEUR-Backdoor.MSIL.Crysan.exe	30
PID 2560 wrote to memory of 2804	2560	HEUR-Backdoor.MSIL.Crysan.exe	30
PID 2560 wrote to memory of 2804	2560	HEUR-Backdoor.MSIL.Crysan.exe	30
PID 2560 wrote to memory of 2828	2560	HEUR-Backdoor.MSIL.Crysan.exe	32
PID 2560 wrote to memory of 2828	2560	HEUR-Backdoor.MSIL.Crysan.exe	32
PID 2560 wrote to memory of 2828	2560	HEUR-Backdoor.MSIL.Crysan.exe	32
PID 2828 wrote to memory of 3032	2828	cmd.exe	34
PID 2828 wrote to memory of 3032	2828	cmd.exe	34
PID 2828 wrote to memory of 3032	2828	cmd.exe	34
PID 2828 wrote to memory of 892	2828	cmd.exe	35
PID 2828 wrote to memory of 892	2828	cmd.exe	35
PID 2828 wrote to memory of 892	2828	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:2560
- 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:2804
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp9FD8.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2828
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:3032
- - 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:892

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp9FD8.tmp.bat

Filesize
149B

MD5
6fd7a5de318b8b9213970f61e6e3cb73

SHA1
2b0b0709c7208c2d1add43742e7b2bb08b707f26

SHA256
e6e45332a506513825d792ac545e1836d4764ebaf3dcaff7677d48c17ebe1cde

SHA512
21cc09334d0e4853e2676ce7016991358ed04b3292a594c83713501a7e2c4abfb8c08ae2d0b312c933906ce89d264006f7725062dac60c68fb6e99ccd4fcef0f

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

Filesize
40.7MB

MD5
c2d1fc4b1c92a9e6a3ed0a454cdcaaad

SHA1
0d97e06cee1d425bb92c06b3e71393f6bae429ef

SHA256
667070baae8e04de1e1c3adea2d8ae6e4ba5119d6c9e0490d2a847f30b66bb07

SHA512
9b4df44c7ba4f9a971b9815e680517ac399ac6a91a756dac5440df1dfa96212e94336f4e18e042bbcd33785aa1e3d29b68000b7ccb2cb2bed294cb822e58e389

Download Submit
memory/892-18-0x0000000000120000-0x0000000000132000-memory.dmp

Filesize
72KB

Download
memory/2560-0-0x000007FEF6493000-0x000007FEF6494000-memory.dmp

Filesize
4KB

Download
memory/2560-1-0x0000000001040000-0x0000000001052000-memory.dmp

Filesize
72KB

Download
memory/2560-2-0x000007FEF6490000-0x000007FEF6E7C000-memory.dmp

Filesize
9.9MB

Download
memory/2560-3-0x000007FEF6493000-0x000007FEF6494000-memory.dmp

Filesize
4KB

Download
memory/2560-4-0x000007FEF6490000-0x000007FEF6E7C000-memory.dmp

Filesize
9.9MB

Download
memory/2560-14-0x000007FEF6490000-0x000007FEF6E7C000-memory.dmp

Filesize
9.9MB

Download