Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 dae46e6e44375107…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:35:26 Authoring application: Microsoft Excel First seen: 2021-09-17
MD5: 8871dd8c4ca9f0d6974ef886c565b501 SHA-1: f6d8b2d13f559c221ea679ac96415aaafa12ed59 SHA-256: dae46e6e44375107773d7647565527f6829effdcac3d669165f62e4dbe8c4895
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel 4.0 macro sheet containing an Auto_Open function, which is a critical finding indicating potential malicious execution. The macro sheet also utilizes dangerous formula APIs, specifically the RUN function, suggesting it's designed to execute arbitrary commands. While no specific family is identified, the technique points to a macro-based execution of 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 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6447 bytes
SHA-256: dcdb468cf8a99e1da3a9128cd348156d10e15e4791dd15a89492e91d19f07055
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  SYIMa
' 0018     20 LABEL : Cell Value, String Constant - akvWz len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I145 
' 0018     23 LABEL : Cell Value, String Constant - EQLnSmnE len=0 
' 0018     25 LABEL : Cell Value, String Constant - fMaiCTsHxE len=0 
' 0018     26 LABEL : Cell Value, String Constant - FwUjHnKQlXe len=0 
' 0018     27 LABEL : Cell Value, String Constant - GLeYYAqiZfXB len=0 
' 0018     25 LABEL : Cell Value, String Constant - hRfYFEoVLZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - htdrE len=0 
' 0018     21 LABEL : Cell Value, String Constant - JjXwTM len=0 
' 0018     27 LABEL : Cell Value, String Constant - KvfOYxmOkwsv len=0 
' 0018     23 LABEL : Cell Value, String Constant - oLnUiVuN len=0 
' 0018     26 LABEL : Cell Value, String Constant - onATxJfVlpl len=0 
' 0018     27 LABEL : Cell Value, String Constant - pkHvrpIFdudn len=0 
' 0018     23 LABEL : Cell Value, String Constant - pYGqioBi len=0 
' 0018     23 LABEL : Cell Value, String Constant - PYliZEuW len=0 
' 0018     21 LABEL : Cell Value, String Constant - qMDYfp len=0 
' 0018     27 LABEL : Cell Value, String Constant - rZIsvEfrNKme len=0 
' 0018     21 LABEL : Cell Value, String Constant - YbSoNq len=0 
' 0018     23 LABEL : Cell Value, String Constant - ykhGgbBH len=0 
' 0018     21 LABEL : Cell Value, String Constant - yOtnpY len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZRQNQawWTMtf len=0 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00f
... (truncated)

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