asyncrat | 7559e6ca8b77400f88bf4e67208a1c32570a670068eccae9e3d226cc5471bd47

Resubmissions

20-09-2024 07:43

240920-jkdj5avhqa 10

16-09-2024 13:49

240916-q4rz7a1apg 10

Analysis

max time kernel
149s
max time network
152s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
16-09-2024 13:49

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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
2548	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
2724	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
2684	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1552	HEUR-Backdoor.MSIL.Crysan.exe
1552	HEUR-Backdoor.MSIL.Crysan.exe
1552	HEUR-Backdoor.MSIL.Crysan.exe
2548	Boomi.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1552	HEUR-Backdoor.MSIL.Crysan.exe
Token: SeDebugPrivilege	2548	Boomi.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 1552 wrote to memory of 2684	1552	HEUR-Backdoor.MSIL.Crysan.exe	30
PID 1552 wrote to memory of 2684	1552	HEUR-Backdoor.MSIL.Crysan.exe	30
PID 1552 wrote to memory of 2684	1552	HEUR-Backdoor.MSIL.Crysan.exe	30
PID 1552 wrote to memory of 2940	1552	HEUR-Backdoor.MSIL.Crysan.exe	32
PID 1552 wrote to memory of 2940	1552	HEUR-Backdoor.MSIL.Crysan.exe	32
PID 1552 wrote to memory of 2940	1552	HEUR-Backdoor.MSIL.Crysan.exe	32
PID 2940 wrote to memory of 2724	2940	cmd.exe	34
PID 2940 wrote to memory of 2724	2940	cmd.exe	34
PID 2940 wrote to memory of 2724	2940	cmd.exe	34
PID 2940 wrote to memory of 2548	2940	cmd.exe	35
PID 2940 wrote to memory of 2548	2940	cmd.exe	35
PID 2940 wrote to memory of 2548	2940	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:1552
- 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:2684
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp32D3.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2940
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2724
- - 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:2548

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\tmp32D3.tmp.bat

Filesize
149B

MD5
4f33c809c8dc7c7631990e238bb0855d

SHA1
c98855d4e87ba17b622f04202f8bcb6e88ca4af4

SHA256
6247086059923340631048b27bdf7bfac98dec002c1f65f65f6f049c7fe43d37

SHA512
9d84b193ca67bd164d648ec75546655e4449c85e0088b32bc016cca58e0de8de8b72c908822ef000c335bcec979f3b76e89a271c85a15d10ec57418c85fd8ced

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

Filesize
48.7MB

MD5
6370ef9c5824fdd1309dedfdf74b6103

SHA1
765d522dbca19dbc261bd176cef76ca5b1314648

SHA256
2d4624520286f80bbd6abb36fec32aa8188f951d8116e58595f60c3669cddd77

SHA512
a05f2afb200ec48c58c28419c403567eb4b43a2a225823cc7f8b8ed2525455754cd5011508fde2c3c13955bb90c1aeff4304882af7e53219d47c5f984f2ded9e

Download Submit
memory/1552-0-0x000007FEF6003000-0x000007FEF6004000-memory.dmp

Filesize
4KB

Download
memory/1552-1-0x0000000000180000-0x0000000000192000-memory.dmp

Filesize
72KB

Download
memory/1552-2-0x000007FEF6000000-0x000007FEF69EC000-memory.dmp

Filesize
9.9MB

Download
memory/1552-3-0x000007FEF6003000-0x000007FEF6004000-memory.dmp

Filesize
4KB

Download
memory/1552-4-0x000007FEF6000000-0x000007FEF69EC000-memory.dmp

Filesize
9.9MB

Download
memory/1552-14-0x000007FEF6000000-0x000007FEF69EC000-memory.dmp

Filesize
9.9MB

Download
memory/2548-18-0x0000000000FD0000-0x0000000000FE2000-memory.dmp

Filesize
72KB

Download