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

Static analysis result for SHA-256 a8c7b053d62cb196…

MALICIOUS

Office (OLE) / .XLS

367.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 172b2263f5ee52025043fba91dd75f24 SHA-1: 2a58587852a9e87f5d68d763fb4eee3009c4443c SHA-256: a8c7b053d62cb1963065a923c92ed7a8069f65b597f12adb14a23a9eb68fdedc
102 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Service Execution: Visual Basic T1204.002 Malicious File: User Execution: Malicious File

The sample is an Excel 4.0 macro-enabled spreadsheet that uses an Auto_Open macro to execute. The document body contains text that appears to be a deobfuscated attempt to construct URLs and commands for downloading and executing a payload. The presence of an Auto_Open defined name and the 'Macro/content-enable lure' heuristic indicate a strong intent to bypass security measures and execute malicious code. The reconstructed strings from the document body, such as 'R', 'LM', 'JJC', 'CBB', 'on', 'oadT', 'wnl', 'LDo', and the URLs, are likely part of the payload execution chain.

Heuristics 4

  • 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.
  • 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://smartpalakatva.com/edQsUZOLlE/th.html
    • https://pilstlcommodities.com/Ov4FlB3lpy/th.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
e61304013e31eadd8bf35fc5d3e6cbadd61463966f2a2d09ae24f65eb0ee3106		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 8349 bytes

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