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

Static analysis result for SHA-256 d4e71869ff0e2363…

MALICIOUS

Office (OLE) / .XLSX

217.0 KB Created: 2000-04-13 21:48:14 Authoring application: Microsoft Excel
MD5: dfb500a801d3cd450e7f54af9ccb8c4d SHA-1: 3ca4848468b81f0d3a6d462f43853e891eeef9e9 SHA-256: d4e71869ff0e236389f9b676931aefd5b898b466910c63f677df9d18d070103e
338 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1059.001 PowerShell T1105 Ingress Tool Transfer

The sample contains a Workbook_Open VBA macro that utilizes Shell() and CreateObject() calls, indicating it attempts to execute arbitrary code. This macro is likely designed to download and execute a secondary payload from one of the embedded URLs. The presence of an appended payload and high entropy further supports this malicious intent.

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 222,208 bytes but its declared streams total only 106,951 bytes — 115,257 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://galaxybrindes
    • https://kapraywala.ga/website/w�E`I�/�����
    • https://www.vidroboxbirigui.com.br/posts/GqlwMINB3GC.php-ixtJCKc&-LNr
    • https://EsteticaCanina.gruporampant.com/wp-content/themes/twentysiq-
    • https://hartlepooltaxi.co.uk/Taxif:QPCeCShop/modulf:QPCeCes/coreupdf:QPCeCaf:QPCeCter/views/js/f:QPCeCbbKt3OpktVRAFni.php
    • https://cryptoexpert.work/core/vendor/doctrine/lexer/lib/cpf9PlDnI8yT4tE.phpXk=aHulp
    • https://games.mobileadsit.com/__MACOSX/paper-panel-all-files/paper-panel/WT3nZjIP.phpWT
    • https://galaxybrindes.com.br/wp-content/plugins/elementor/data/base/F43npljSP.phpRI_85UE
    • https://kapraywala.ga/website/wp-includes/js/jquery/ui/kk919Q3Ead7kgFQ.phpndCq
    • https://www.eloyfestas.com.br/posts/EwyU0Hv3aBAST.phppl_8CDGBSkx9R|g

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
39b8012d6995228812a85cad2df5521caa7eee78e2e39334ab3b4eee56de21de
vba-macro oletools.olevba.extract_macros (decoded VBA source) 14610 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.