asyncrat | e3f245020bcf6beaca39b8cc9eb06b3db7f209356e765f41d8306ad56735e944 | Triage

Resubmissions

Analysis

max time kernel
104s
max time network
105s
platform
windows10-1703_x64
resource
win10-20240404-en
resource tags

arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
submitted
24-05-2024 12:19

Sharing

Report Analysis Logs

General

Target

e3f245020bcf6beaca39b8cc9eb06b3db7f209356e765f41d8306ad56735e944.exe
Size

231KB
MD5

144f1b1c4b9cdad97d8dd1a3a89e7ea1
SHA1

1a11d76a6ab646a0d699efa0e5fc71de6e5af92c
SHA256

e3f245020bcf6beaca39b8cc9eb06b3db7f209356e765f41d8306ad56735e944
SHA512

2697bde82afdef6b3e9079e9add7a9026fffec2a9093932d6c05256fe73df0ef9a2fac4f26de28e2b5d87cc7dd0651dac80baa2a3841148409ab2c3ea32b6882
SSDEEP

6144:TZ+geAPqybJnO5AbpbO9jhJdrz8U6n4eOP07NyGyG2qYlw5S3U19:T4FvybJNpazzfoyG

Score

10^/10

asyncrat default persistence rat

Malware Config

Extracted

Family

asyncrat

Version

Venom RAT + HVNC + Stealer + Grabber v6.0.3

Botnet

Default

C2

66.235.168.242:4449

Mutex

scgofjarww

Attributes

delay
1
install
true
install_file
Loader.exe
install_folder
%AppData%

aes.plain

Extracted

Family

asyncrat

Botnet

Default

C2

66.235.168.242:3232

Attributes

delay
1
install
true
install_file
Loaader.exe
install_folder
%AppData%

aes.plain

Signatures

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

Async RAT payload 2 IoCs

resource	yara_rule
behavioral1/files/0x000900000001ab6d-6.dat	family_asyncrat
behavioral1/files/0x000800000001ac53-12.dat	family_asyncrat

Executes dropped EXE 5 IoCs

pid	Process
4420	Client.exe
4236	Infected.exe
4428	WinDefend.exe
4216	Loaader.exe
5104	Loader.exe

Adds Run key to start application 2 TTPs 1 IoCs

Registry Run Keys / Startup Folder

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-160447019-1232603106-4168707212-1000\Software\Microsoft\Windows\CurrentVersion\Run\YourAppName = "C:\\Users\\Admin\\AppData\\Local\\Temp\\WinDefend.exe"	WinDefend.exe

Looks up external IP address via web service 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
2	api64.ipify.org
3	api64.ipify.org

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 2 IoCs

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

Scheduled Task/Job

pid	Process
5028	schtasks.exe
2496	schtasks.exe

Delays execution with timeout.exe 2 IoCs

pid	Process
4324	timeout.exe
3376	timeout.exe

Suspicious behavior: EnumeratesProcesses 50 IoCs

pid	Process
4236	Infected.exe
4236	Infected.exe
4236	Infected.exe
4236	Infected.exe
4236	Infected.exe
4236	Infected.exe
4236	Infected.exe
4236	Infected.exe
4236	Infected.exe
4236	Infected.exe
4236	Infected.exe
4236	Infected.exe
4236	Infected.exe
4236	Infected.exe
4236	Infected.exe
4420	Client.exe
4420	Client.exe
4420	Client.exe
4420	Client.exe
4420	Client.exe
4420	Client.exe
4420	Client.exe
4420	Client.exe
4420	Client.exe
4420	Client.exe
4420	Client.exe
4420	Client.exe
4420	Client.exe
4420	Client.exe
4420	Client.exe
5104	Loader.exe
5104	Loader.exe
5104	Loader.exe
5104	Loader.exe
5104	Loader.exe
5104	Loader.exe
5104	Loader.exe
5104	Loader.exe
5104	Loader.exe
5104	Loader.exe
5104	Loader.exe
5104	Loader.exe
5104	Loader.exe
5104	Loader.exe
5104	Loader.exe
5104	Loader.exe
5104	Loader.exe
5104	Loader.exe
5104	Loader.exe
5104	Loader.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	4420	Client.exe
Token: SeDebugPrivilege	4428	WinDefend.exe
Token: SeDebugPrivilege	4236	Infected.exe
Token: SeDebugPrivilege	5104	Loader.exe
Token: SeDebugPrivilege	4216	Loaader.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5104	Loader.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 3796 wrote to memory of 4420	3796	e3f245020bcf6beaca39b8cc9eb06b3db7f209356e765f41d8306ad56735e944.exe	74
PID 3796 wrote to memory of 4420	3796	e3f245020bcf6beaca39b8cc9eb06b3db7f209356e765f41d8306ad56735e944.exe	74
PID 3796 wrote to memory of 4236	3796	e3f245020bcf6beaca39b8cc9eb06b3db7f209356e765f41d8306ad56735e944.exe	75
PID 3796 wrote to memory of 4236	3796	e3f245020bcf6beaca39b8cc9eb06b3db7f209356e765f41d8306ad56735e944.exe	75
PID 3796 wrote to memory of 4428	3796	e3f245020bcf6beaca39b8cc9eb06b3db7f209356e765f41d8306ad56735e944.exe	76
PID 3796 wrote to memory of 4428	3796	e3f245020bcf6beaca39b8cc9eb06b3db7f209356e765f41d8306ad56735e944.exe	76
PID 3796 wrote to memory of 4428	3796	e3f245020bcf6beaca39b8cc9eb06b3db7f209356e765f41d8306ad56735e944.exe	76
PID 4236 wrote to memory of 2368	4236	Infected.exe	77
PID 4236 wrote to memory of 2368	4236	Infected.exe	77
PID 4236 wrote to memory of 2208	4236	Infected.exe	79
PID 4236 wrote to memory of 2208	4236	Infected.exe	79
PID 2208 wrote to memory of 4324	2208	cmd.exe	81
PID 2208 wrote to memory of 4324	2208	cmd.exe	81
PID 2368 wrote to memory of 5028	2368	cmd.exe	82
PID 2368 wrote to memory of 5028	2368	cmd.exe	82
PID 4420 wrote to memory of 4524	4420	Client.exe	83
PID 4420 wrote to memory of 4524	4420	Client.exe	83
PID 4420 wrote to memory of 4360	4420	Client.exe	85
PID 4420 wrote to memory of 4360	4420	Client.exe	85
PID 4360 wrote to memory of 3376	4360	cmd.exe	87
PID 4360 wrote to memory of 3376	4360	cmd.exe	87
PID 4524 wrote to memory of 2496	4524	cmd.exe	88
PID 4524 wrote to memory of 2496	4524	cmd.exe	88
PID 2208 wrote to memory of 4216	2208	cmd.exe	89
PID 2208 wrote to memory of 4216	2208	cmd.exe	89
PID 4360 wrote to memory of 5104	4360	cmd.exe	90
PID 4360 wrote to memory of 5104	4360	cmd.exe	90

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\e3f245020bcf6beaca39b8cc9eb06b3db7f209356e765f41d8306ad56735e944.exe
"C:\Users\Admin\AppData\Local\Temp\e3f245020bcf6beaca39b8cc9eb06b3db7f209356e765f41d8306ad56735e944.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:3796
- C:\Users\Admin\AppData\Local\Temp\Client.exe
  "C:\Users\Admin\AppData\Local\Temp\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4420
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Loader" /tr '"C:\Users\Admin\AppData\Roaming\Loader.exe"' & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4524
  - - C:\Windows\system32\schtasks.exe
      schtasks /create /f /sc onlogon /rl highest /tn "Loader" /tr '"C:\Users\Admin\AppData\Roaming\Loader.exe"'
      4⤵
      Creates scheduled task(s)
      PID:2496
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp6BD9.tmp.bat""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4360
  - - C:\Windows\system32\timeout.exe
      timeout 3
      4⤵
      Delays execution with timeout.exe
      PID:3376
  - - C:\Users\Admin\AppData\Roaming\Loader.exe
      "C:\Users\Admin\AppData\Roaming\Loader.exe"
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of SetWindowsHookEx
      PID:5104
- C:\Users\Admin\AppData\Local\Temp\Infected.exe
  "C:\Users\Admin\AppData\Local\Temp\Infected.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4236
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Loaader" /tr '"C:\Users\Admin\AppData\Roaming\Loaader.exe"' & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2368
  - - C:\Windows\system32\schtasks.exe
      schtasks /create /f /sc onlogon /rl highest /tn "Loaader" /tr '"C:\Users\Admin\AppData\Roaming\Loaader.exe"'
      4⤵
      Creates scheduled task(s)
      PID:5028
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp6810.tmp.bat""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2208
  - - C:\Windows\system32\timeout.exe
      timeout 3
      4⤵
      Delays execution with timeout.exe
      PID:4324
  - - C:\Users\Admin\AppData\Roaming\Loaader.exe
      "C:\Users\Admin\AppData\Roaming\Loaader.exe"
      4⤵
      Executes dropped EXE
      Suspicious use of AdjustPrivilegeToken
      PID:4216
- C:\Users\Admin\AppData\Local\Temp\WinDefend.exe
  "C:\Users\Admin\AppData\Local\Temp\WinDefend.exe"
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious use of AdjustPrivilegeToken
  PID:4428

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

Persistence

Boot or Logon Autostart Execution

Registry Run Keys / Startup Folder

Scheduled Task/Job

Privilege Escalation

Boot or Logon Autostart Execution

Registry Run Keys / Startup Folder

Scheduled Task/Job

Defense Evasion

Modify Registry

Credential Access

Discovery

Query Registry

System Information Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\Client.exe

Filesize
74KB

MD5
7ac0adf482250172280defec7a7054da

SHA1
20a25f0da68c309d062c4628ead8b6f377ac7969

SHA256
3caa5f06008365fbecf46198744793c36c42309b49a6324bebe8123be10f87d5

SHA512
d03d033b931f3d39f95a1ec1cdc7d9014783f11b2438c265dd72c0bc34f9d5ced534a38c7c1c88ff930868fd9cf60521dd556b5c486c5cf364f798f39215a1aa

Download Submit
C:\Users\Admin\AppData\Local\Temp\Infected.exe

Filesize
63KB

MD5
b8d455465260a845db35492fda5a8888

SHA1
287b0ba049ad8f3be802d2224efb86dba72d3221

SHA256
a150a433c6a3e4278f6cc4cbc85863fc431e5c1e65081ad67253513e8ca01282

SHA512
5dba43ae31420de362593752e8ff491afbe8d20f183f6b95e6962ea1e637c7bf3bd50b5213e4d928a96b85d9b54841ee697798b0089624b13ef7eded826cd86a

Download Submit
C:\Users\Admin\AppData\Local\Temp\WinDefend.exe

Filesize
87KB

MD5
5fc6a541845fdafb597ddfb98fa28b54

SHA1
22e5dd50ddd71bc39c812db0f9b164ca10c556dd

SHA256
64e4dedb36812766c522c79cae57b7f3b2694efaa396151d4117a70282166117

SHA512
f174e4ccc89d4a7473001a9153a9c3d63bedd393dda1ea3be171768b7587846722ad07445adeafa52ef54802a8ac84eb33ab1799248dcbf7db60aa4f311da5e3

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp6810.tmp.bat

Filesize
151B

MD5
0d472d52a848c3e6067313fdf7e4c437

SHA1
4c5e38a73cb0bd11b98c8e52a0e85c0229cb3cad

SHA256
21858b8c8e5b042c21cb51fd518f44fdc48508c0056410b84767d88108965e20

SHA512
565fe7cb28ad57dcfb4ccf38f3edaa172445984ecb9175ddcb0b6ac00fe464d9347d8228d02ba2c2c14ff5bcd0f235b6eb88c1e15331fc108f04016c4d7317c5

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp6BD9.tmp.bat

Filesize
150B

MD5
80761470cc0952e963de57bd9e945190

SHA1
787fb32f7ee05deb1834408bf1250b7b6bbb3afc

SHA256
15b2cde6f7ba3229213cc19fecd40851bc501d5a1d3fad1677f547cc52b5b6a5

SHA512
e772698315b3d52f3a6f2ba56410fb514f0a3365e0f9b5814704f224f722f1cc0d2a9982c60939508df0c8ca21e7ed0e775c5af2a3edcf91b0f67036d82c1c3b

Download Submit
C:\Users\Admin\AppData\Roaming\MyData\DataLogs.conf

Filesize
8B

MD5
cf759e4c5f14fe3eec41b87ed756cea8

SHA1
c27c796bb3c2fac929359563676f4ba1ffada1f5

SHA256
c9f9f193409217f73cc976ad078c6f8bf65d3aabcf5fad3e5a47536d47aa6761

SHA512
c7f832aee13a5eb36d145f35d4464374a9e12fa2017f3c2257442d67483b35a55eccae7f7729243350125b37033e075efbc2303839fd86b81b9b4dca3626953b

Download Submit
C:\Users\Public\SSSS.log

Filesize
4KB

MD5
1b922fea344996b1a0aaa8e00db9e836

SHA1
20befb7dedab9605b5142d1f36b69e3c32dd50b9

SHA256
e4c518642e383cd1a728db10e6e84af56fe2be67053c406415491bba278822ef

SHA512
5f105ac9203c4885ba549b62113a50a12cd8f992c90215a8f28430d3f41c738a118ad551279f19190c45ef2f750a549e04a57ef5c5d7f54caefdfdb71046c70f

Download Submit
memory/3796-24-0x00007FF8A3940000-0x00007FF8A432C000-memory.dmp

Filesize
9.9MB

Download
memory/3796-0-0x0000000000FD0000-0x0000000001010000-memory.dmp

Filesize
256KB

Download
memory/3796-1-0x00007FF8A3943000-0x00007FF8A3944000-memory.dmp

Filesize
4KB

Download
memory/3796-7-0x00007FF8A3940000-0x00007FF8A432C000-memory.dmp

Filesize
9.9MB

Download
memory/4236-14-0x0000000000760000-0x0000000000776000-memory.dmp

Filesize
88KB

Download
memory/4236-26-0x00007FF8A3940000-0x00007FF8A432C000-memory.dmp

Filesize
9.9MB

Download
memory/4236-35-0x00007FF8A3940000-0x00007FF8A432C000-memory.dmp

Filesize
9.9MB

Download
memory/4420-23-0x00007FF8A3940000-0x00007FF8A432C000-memory.dmp

Filesize
9.9MB

Download
memory/4420-18-0x00007FF8A3940000-0x00007FF8A432C000-memory.dmp

Filesize
9.9MB

Download
memory/4420-10-0x0000000000300000-0x0000000000318000-memory.dmp

Filesize
96KB

Download
memory/4420-42-0x00007FF8A3940000-0x00007FF8A432C000-memory.dmp

Filesize
9.9MB

Download
memory/4428-25-0x0000000000430000-0x000000000044E000-memory.dmp

Filesize
120KB

Download
memory/4428-30-0x0000000004F60000-0x0000000004F6A000-memory.dmp

Filesize
40KB

Download
memory/4428-29-0x0000000004E70000-0x0000000004F02000-memory.dmp

Filesize
584KB

Download
memory/4428-28-0x00000000098F0000-0x0000000009DEE000-memory.dmp

Filesize
5.0MB

Download
memory/4428-27-0x0000000002600000-0x0000000002606000-memory.dmp

Filesize
24KB

Download