Malicious Office (OOXML) / .XLSM — malware analysis report

Static analysis result for SHA-256 f41c4588d2ef8936…

MALICIOUS

Office (OOXML) / .XLSM

16.7 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300
MD5: 5fd958006a94c6145364c06bbf264d06 SHA-1: d5cc7dc1083508dbe5531db67a3f78866e00330c SHA-256: f41c4588d2ef8936d9417069a1c5a44833fb2994c60c54bda14b1aac9aa7b83a
100 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Service Execution: Service Control T1059.001 PowerShell T1204.002 Malicious File: User Execution: Malicious File

The sample is an Excel 4.0 macro sheet (XLSM) that utilizes dangerous formula APIs like CALL and RUN to execute arbitrary commands. The embedded document body text explicitly shows commands to create a directory, download a file from 'http://jvdattorney.com/stager/babmboa.php', and then execute it. This indicates the primary function is to act as a downloader for a second-stage payload.

Heuristics 3

  • Dangerous XLM formula APIs: HALT, CALL, RUN critical OOXML_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet uses formula APIs that call directly into Win32 (=CALL/=EXEC/=REGISTER/=FORMULA). These are the primitives used to download payloads, write files, and start processes from an XLM macro without invoking VBA.
  • Excel 4.0 macro sheet (1 sheet(s)) high OOXML_XLM_MACROSHEET
    Spreadsheet contains an Excel 4.0 (XLM) macro sheet — XLM was a major Office malware vector during 2020-2022 and evaded many VBA-focused controls before Microsoft tightened XLM defaults. Even legitimate XLM use is rare in modern workbooks.
  • 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://jvdattorney.com/stager/babmboa.php

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.xml
6c22996b04be39f8b14d149497a6de295ea80c6e0986d8e1f65d04f13d6eb320		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 2261 bytes

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