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

Static analysis result for SHA-256 01577d6fccb720ca…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: b1496eaf7198ca1092ba59238d5ea503 SHA-1: 399cf5cdd0f8d95fedec08587d6e95d15160d618 SHA-256: 01577d6fccb720ca1a895746be46c994013f42a310302fac9914f1d7f64b0d0d
242 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open macro, which is a critical finding. The macro uses the RUN function and a CALL to kernel32.dll's CreateA function, indicating it's designed to execute code. The macro also references the URL https://justhrng.com/ds/231120.gif, strongly suggesting it acts as a downloader for a second-stage payload. ClamAV also detected this as a downloader.

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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