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

Static analysis result for SHA-256 26fb639c13974345…

MALICIOUS

Office (OLE) / .XLS

65.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-05-23
MD5: 16cbc33319f2620def463b6dae9228c5 SHA-1: cca7143f34626ea12b320aa299e09a821e3e56a1 SHA-256: 26fb639c139743453dccd14c42b851f7192a1dbcf1e865b866dfb5e53975c3fd
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 macro sheet with an Auto_Open entry that executes dangerous functions. The macro sheet contains concatenated strings that reconstruct the following URLs: hxxps://newkano.com/wp-admin/66rIsrVwoPKUsjcAs/, hxxp://ocalogulari.com/inc/Wcm82enrs8/, hxxps://myphamcuatui.com/assets/OPVeVSpO/, and hxxp://sieuthiphutun gxengan.com/old_source/9boJQZpTSdQ/E. These URLs are likely used to download and execute a second-stage payload.

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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