Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 9835b30340902d19…

MALICIOUS

Office (OLE) / .XLS

215.5 KB Created: 2000-04-13 21:48:14 Authoring application: Microsoft Excel
MD5: 9c2c38b4685ebbeb9ae981b3ba51961b SHA-1: 7ef416073f0a89d49e4fee022ea3d23983c7afc7 SHA-256: 9835b30340902d19ed9560fb8eda2af745161ef0d178ccbfae9679b83291e2f3
338 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1059.001 PowerShell T1204.002 Malicious File

The sample is an OLE Excel file containing a Workbook_Open VBA macro that utilizes Shell() and CreateObject() calls. This script is designed to download and execute a second-stage payload from one of the embedded URLs. The presence of an appended payload and the invoice lure heuristic further support its malicious nature. No document body text was available for analysis.

Heuristics 11

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 220,672 bytes but its declared streams total only 105,617 bytes — 115,055 bytes (52%) live in unallocated sector slack. This is the canonical hiding place for pre-macro-era Office exploit payloads (XOR-encoded shellcode reached via a parser pointer-corruption bug in the document structure).
  • OLE file has appended executable-looking payload bytes high OLE_APPENDED_PAYLOAD
    OLE compound file contains a large high-entropy region beyond the declared major streams and that region includes shellcode, PE, or loader API markers. This is a payload-carrier signal, not a specific CVE attribution by itself.
  • 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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — context-specific rules above attribute URLs they actually evaluated; this rule lists URLs that were present in the bytes but were not otherwise tied to a specific finding.
    URL https://tricomenergy.com.p�
    • https://ganchohigienico.com/wp-content/plugins/bridge-core/modules/core-dashboard/RBZYy1Zl.phpJ6m(uKTj-$=%
    • https://yourcodeloVj\oiberdade.com/mail/PHPMaileoVj\or_5.2.0/test_script/imaoVj\oges/ySc5emoVj\ogn6yieudoVj\oo.php
    • https://tricomenergy.com.pk/fonts/font-awesome-4.7.0/css/QblbClNi.phpW9flz(J^%7BqH*4
    • https://expensas.dinamico.com.ar/vendor/myclabs/php-enum/src/PHPUnit/GGqeg1MF.phpMMt3(q\F#=B;d|9
    • https://cryptoexpert.work/core/vendor/doctrine/lexer/lib/cpf9PlDnI8yT4tE.php7^195ri3l
    • https://hartlepooltaxi.co.uk/TaxiShop/modules/coreupdater/views/js/bbKt3OpktVRAFni.phpqTZNV
    • https://sharmina.sharmina.org/wp-content/plugins/all-in-one-wp-migration/lib/controller/9MuUJGgZqj.php9,ws@,hb@.1

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
deb5de9432ad2b4ba2005d0a7eb7efe1f7dcee25064cb35f8bd2540b0f85601b		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 14034 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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