Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ffd2860f4cc1f88b…

MALICIOUS

Office (OLE)

122.0 KB Created: 2010-03-03 04:22:31 Authoring application: Microsoft Excel
MD5: d6845fc67883794572c337e1dffbf595 SHA-1: 7bc6d35bbd81b2bb759ef80cb3651b67a1d43b4c SHA-256: ffd2860f4cc1f88bad9921ad017369a841b6a6a50763c4dcc2eb8984ebfdf365
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1059.001 PowerShell T1547.001 Registry Run Keys / Startup Folder

The sample is an Excel 4.0 (XLM) macro-enabled document. Heuristics indicate the presence of an Auto_Open macro, which is a common technique for executing malicious code upon opening the workbook. The macro sheet contains references to 'XL4Poppy' and 'Normal_MacroVirus', suggesting a legacy macro-virus family. The 'RUN' function is also present, indicating potential execution of arbitrary commands. The document body contains Vietnamese text related to financial statements, likely a lure.

Heuristics 4

  • Excel 4.0 (XLM) Auto_Open + macro sheet critical OLE_XLM_AUTOOPEN
    Workbook contains an Auto_Open / Auto_Close defined name together with an Excel 4.0 macro sheet — the canonical XLM auto-execution shape used by malware families such as Emotet and QakBot.
  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Legacy XLM macro-virus family marker critical OLE_XLM_LEGACY_MACRO_VIRUS
    Workbook contains an Excel 4.0 macro Auto_Open chain and legacy macro-virus family strings. This is a narrow indicator for infected XLM workbooks rather than ordinary formula use.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
e574904c9882bde664435954ec1a5e53ea62d2f0ba938c1eb9f303f2b443bc19		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 24418 bytes

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