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

Static analysis result for SHA-256 0fb1df5edca1c2ac…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: d107470be3c2d7aba8ad2e27ebc7295a SHA-1: 42b1c64e4827b2a2cb6226ad43cdf27dd54dee44 SHA-256: 0fb1df5edca1c2acef9621c8e7f240647ae374fe06694e92d9f5c7783e7f4e3e
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The file contains Excel 4.0 macros with an Auto_Open entry, indicating it will execute automatically upon opening. The macros utilize the RUN function and CALL to execute Win32 API functions, specifically referencing 'kernel32' and 'CreateA' which is likely part of a command to download and execute a second-stage payload. The embedded URL 'https://justhrng.com/ds/231120.gif' is the likely source of this payload.

Heuristics 6

  • 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.
  • ClamAV: Doc.Downloader.Docusign0521-9864805-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Docusign0521-9864805-0
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
  • 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://justhrng.com/ds/231120.gif
    • https://justhrng.com/ds/231120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
9badecf38f0cfde72dfd647ab7be67f2ec36dad7a41b3ad4474856d47fd4391b		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6060 bytes

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