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

Static analysis result for SHA-256 107aa6d953d2f3cc…

MALICIOUS

Office (OLE) / .XLS

50.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: b6e90f9a0e95ac7c3f3ff6fdf429200f SHA-1: ac8890ef882a227fc469a6472f687c86129dfba8 SHA-256: 107aa6d953d2f3cc30e5067fe6096cce7fc14d3c2b25774acd943765f2d5de81
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, including an Auto_Open function, which is a known technique for executing malicious code. The macro sheet also contains a reference to 'RUN=0', indicating it is designed to execute a program. The document body and heuristics suggest a lure to enable macros, which is common for macro-based malware. The embedded URLs are likely used to download a second-stage payload.

Heuristics 5

  • 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.
  • 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 http://tomsjewelry.net/mjecfwkpcslh/D�
    • http://tomsjewelry.net/mjecfwkpcslh/530340.png
    • http://tomsjewelry.net/mjecfwkpcslh/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
ab4f901a042deeed855a1f0bc6be58975f70a170e912bb3a9631df8cf81f85f8		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 3542 bytes

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