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

Static analysis result for SHA-256 483a82699cd02861…

MALICIOUS

Office (OLE) / .XLS

3.38 MB Created: 2000-05-26 16:45:09 Authoring application: Microsoft Excel
MD5: bdc830bcac60b2ee28cbaea9c920c3b4 SHA-1: 5dbd93f9ac06b6c7dfc51b533e75570ef338f4e9 SHA-256: 483a82699cd028618e44267f7bc7a901a0b80e8e06131e9dc214d91af45e1cca
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1566.002 Spearphishing Attachment

The sample is identified as malicious due to critical heuristic firings indicating the presence of legacy Excel 4.0 (XLM) macros and a macro-virus family marker. The VBA macro code, though truncated, includes declarations for Windows API functions like WritePrivateProfileString and GetWindowsDirectory, suggesting attempts to interact with the system or modify configuration. The presence of the Auto_Open macro and the XLM_LEGACY_MACRO_VIRUS heuristic strongly indicate that the macro is designed to execute automatically upon opening the spreadsheet, likely to download and run a secondary payload. The document body content is financial and technical, which could serve as 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.
  • 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.
  • ClamAV: Xls.Malware.Generic-6680536-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Malware.Generic-6680536-0
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
f1a0a1924498708ffcd80c76cbe0099a7455fcbadc042a137c46e5b69a1d37b8		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 9033 bytes

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