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

Static analysis result for SHA-256 db77b5cc1194f3a6…

MALICIOUS

Office (OLE) / .XLS

65.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-05-23
MD5: 2abb434b33a320853d965261f65dad60 SHA-1: a736cde8928276dc984a0cf499e811592f188aa9 SHA-256: db77b5cc1194f3a6fbfcf17497d6e920ddd715f7a99f128b503163306ab981a7
140 Risk Score

Malware Insights

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

The critical heuristics OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN indicate the presence of an Excel 4.0 Auto_Open macro. The macro uses concatenated strings to construct URLs, which are then likely used to download and execute a second-stage payload. The reconstructed URLs are: https://newkano.com/wp-admin/66rIsrVwoPKUsjcAs/, http://ocalogulari.com/inc/Wcm82enrs8/, https://myphamcuatui.com/assets/OPVeVSpO/, and http://sieuthiphutungan.com/old_source/9boJQZpTSdQ/E.

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
67f6b164c4d6ea1ea8efe2ccdff056dde7fd1072da2bb20afe3b275864086c71		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 7678 bytes

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