Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 65fe14b2963ff170…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:38:59 Authoring application: Microsoft Excel First seen: 2021-06-30
MD5: 9a28b38d60c2f813dcc43083058e3bb9 SHA-1: 6fdb6e709e0895cce1ec85066a72563da95f3af3 SHA-256: 65fe14b2963ff170fdec2b69d72a41e03bf2b6242b1c5fb5ecf084ce340a1589
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, which is a common technique for executing malicious code upon opening the document. The macro sheet contains a dangerous formula API, specifically 'RUN', suggesting it is designed to execute an external program. While no specific URLs or hashes were extracted, the presence of the Auto_Open macro strongly implies a downloader or initial execution stage for a more complex attack.

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) 6812 bytes
SHA-256: ee311d02550ef812d9268ac141e96544a0695336b93bc56738f218e148f11353
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  cihjiLmLl
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E175 
' 0018     24 LABEL : Cell Value, String Constant - BNurQUdUo len=0 
' 0018     23 LABEL : Cell Value, String Constant - BZrJkZcn len=0 
' 0018     25 LABEL : Cell Value, String Constant - FHZVAiwPRA len=0 
' 0018     22 LABEL : Cell Value, String Constant - fnNcaaN len=0 
' 0018     21 LABEL : Cell Value, String Constant - HisvVp len=0 
' 0018     25 LABEL : Cell Value, String Constant - IazDmmAAuG len=0 
' 0018     21 LABEL : Cell Value, String Constant - ktzySv len=0 
' 0018     22 LABEL : Cell Value, String Constant - lDQNUti len=0 
' 0018     27 LABEL : Cell Value, String Constant - ofIUKpoNghmR len=0 
' 0018     27 LABEL : Cell Value, String Constant - ojQgtithSAIs len=0 
' 0018     21 LABEL : Cell Value, String Constant - rsIBud len=0 
' 0018     22 LABEL : Cell Value, String Constant - RsKDxHQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - SNvLjEvFXai len=0 
' 0018     20 LABEL : Cell Value, String Constant - sqJqq len=0 
' 0018     20 LABEL : Cell Value, String Constant - svDij len=0 
' 0018     24 LABEL : Cell Value, String Constant - viXMrNXgV len=0 
' 0018     20 LABEL : Cell Value, String Constant - YtFcl len=0 
' 0018     25 LABEL : Cell Value, String Constant - YwoOtjWggp len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZcdUJuPsrR len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZCfBb 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
' 00fd     10 LAB
... (truncated)

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