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

Static analysis result for SHA-256 4d98f2f5c66f7883…

MALICIOUS

Office (OLE) / .XLS

88.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 61d44445dca466f73e2278cd99b7b14f SHA-1: eadb7e3b8f46524e7fb96fad56e6fcb234227ecb SHA-256: 4d98f2f5c66f78838cf3bdca358c81e5ecc6ec1bcafb8afdf5c805590399cb3f
80 Risk Score

Malware Insights

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

The presence of XLM macros, specifically the Auto_Open function utilizing dangerous APIs like RUN, indicates an attempt to execute arbitrary code. The heuristic 'SE_ENABLE_LURE' confirms the document is designed to trick the user into enabling these macros. The extracted URLs are likely used to download and execute a second-stage payload.

Heuristics 4

  • XLM Auto_Open with dangerous formula APIs high 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.
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://marcostrombetta.com.br/ds/1802.Dc
    • https://marcostrombetta.com.br/ds/1802.gif

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
74b39ac876c711da9866ba213e40ef1fb0362e827270b88924e777d9d12c26aa		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 3270 bytes

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