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

Static analysis result for SHA-256 9b817ebda2865050…

MALICIOUS

Office (OLE) / .XLS

86.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 1f8a3bc338433d911246cf83f0d39b7a SHA-1: 91241e16282ecab375fad84ddbf94b7ee6b91101 SHA-256: 9b817ebda28650501ad8f8f771d7520dd9eaf366f2949083f3865320397dbc2e
160 Risk Score

Malware Insights

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

The file contains an Excel 4.0 macro sheet with an Auto_Open function, which is a critical finding. The macro sheet includes a call to 'RUN=0', indicating it attempts to execute an external program. The 'SE_ENABLE_LURE' heuristic suggests the document prompts the user to enable macros. The reconstructed URL 'http://xlsinpa02lzjvt03anas.com/index.' and the command fragment 'rundll .. undll' strongly suggest the macro is intended to download and execute a second-stage payload. The presence of 'Auto_Open' and the execution of external commands are key indicators of a downloader or initial access stage.

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.
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
a85eb4de9cfe3fe00bb6b820fec77c1720da7de1fe3c57572458c59bec552071		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2473 bytes

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