Malicious Office (OOXML) / .XLSM — malware analysis report

Static analysis result for SHA-256 083b2f418d01e30e…

MALICIOUS

Office (OOXML) / .XLSM

220.2 KB Created: 2021-05-07 12:34:17 UTC Authoring application: Microsoft Excel 15.0300
MD5: ee2cc7489cf90c792e136b6017fcf493 SHA-1: febf9f6b7e89dea30e61f8e44ddf9c6e0bee0789 SHA-256: 083b2f418d01e30ea145ba1cc9b7c33261c4f52656b5533dca2d6736f02e7178
310 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer

The critical heuristic 'OLE_VBA_HTTP_DROP_EXEC' indicates that the VBA macro downloads and writes a file to disk. The Workbook_Open macro is present and configured to execute automatically, suggesting it attempts to download and run a payload from one of the embedded URLs. The presence of 'Wscript.Shell' and 'rundll32.exe' further supports the execution of downloaded content.

Heuristics 9

  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
  • ClamAV: Xls.Downloader.TrendMicroDridex0521-9860965-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.TrendMicroDridex0521-9860965-0
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://blog.techdesigners.ir/ytlRUHwAF.php
    • https://co-deporte.com/wp-content/plugins/revslider/includes/InstagramScraper/DR34CZJP1juKE.php
    • https://radiotupa.multsis.com.br/4uGJ27Vj5.php
    • https://firsthand.ng/wp-content/plugins/woocommerce/src/Admin/ZD21U3Bx6LCk.php
    • https://protetoestufas.com.br/plugins/rainbow/js/language/hnejZqaw.php
    • https://chefalle.com/wp-includes/sodium_compat/namespaced/Core/ChaCha20/4Uf6CSbEGj3.php
    • https://intecmmesac.com/images/5xK5fW2OdjtD.php
    • https://2nub.es/lib/js/prettyphoto/images/prettyPhoto/DDndV1TI5lvC3M7.php
    • https://certifica.app.infoweb.boatcover.org/dt_091901820028/condivise/immagini/icone/icone-default-on/2NJsNm1KQuTMMVo.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
03ba60e888a12de6cc109bcecefc19a8f5647fd10d98c962b7d4f6ddb2efc428		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 41600 bytes
vbaProject_00.bin
95c5cc3b1577a65742ac0401b0e26240862fac3007f09dcb7538fe201b501156		 vba-project OOXML VBA project: xl/vbaProject.bin 262144 bytes

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