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

Static analysis result for SHA-256 f8eaa9c55d6901d6…

MALICIOUS

Office (OLE) / .XLS

46.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-06-12
MD5: 2a59708764d5dc39e6d9747b32c66cb1 SHA-1: 78342e7f9c532c7c27d9abd4efabafb10b42ee43 SHA-256: f8eaa9c55d6901d69a13b07cbaee13695f6bb40e418c44749491271552306a4d
140 Risk Score

Malware Insights

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

The critical heuristics OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN indicate the presence of Excel 4.0 macros designed to auto-execute. The script section confirms an Auto_Open entry and reveals concatenated URLs, which are reconstructed as http://kro nostr.com/tr/68yHRhfU7Qj/ and http://tekstiluzmangorus.com/wp-admin/GKdQvamnP cK/. These URLs are likely used to download and execute a second-stage payload, a common technique for initial access.

Heuristics 3

  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
f02d63843d495ffd8e99f1b7fe5f87a80501a758c9a61d8585f8be9700f36cb3		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 7798 bytes

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