Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a07619bd40978068…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:45 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 1ba13ab506a3a8952af816dbc66acb4c SHA-1: 6b79c1da2064728631ef6afca1735f951266a9a8 SHA-256: a07619bd40978068cb44118300b1ea67b55c13370d698fc467f8d365e8e72ff9
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 macro, which is a known technique for executing malicious code upon opening the workbook. The critical heuristics indicate the presence of dangerous formula APIs within the Auto_Open function, suggesting it's designed to run arbitrary commands. No specific family could be identified, and no external IOCs were extracted.

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) 6633 bytes
SHA-256: e67b161370da1402ca9c2f28e9377d64c6c6fbc3c51f63222a293d271f6ea0c9
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  QpULqpcYpCO
' 0018     27 LABEL : Cell Value, String Constant - alcRkDHobOJm len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B152 
' 0018     21 LABEL : Cell Value, String Constant - BGitCX len=0 
' 0018     23 LABEL : Cell Value, String Constant - bSUniUmI len=0 
' 0018     22 LABEL : Cell Value, String Constant - EODIjUu len=0 
' 0018     23 LABEL : Cell Value, String Constant - gmpFiUmD len=0 
' 0018     27 LABEL : Cell Value, String Constant - GuCuTczpPEod len=0 
' 0018     26 LABEL : Cell Value, String Constant - HtGCgXWhmxa len=0 
' 0018     21 LABEL : Cell Value, String Constant - HuHdsn len=0 
' 0018     27 LABEL : Cell Value, String Constant - IlKbytvSIxnc len=0 
' 0018     26 LABEL : Cell Value, String Constant - LlntsyJxgWT len=0 
' 0018     20 LABEL : Cell Value, String Constant - MYnwr len=0 
' 0018     20 LABEL : Cell Value, String Constant - NLsGF len=0 
' 0018     27 LABEL : Cell Value, String Constant - nnwOdTFgAIfB len=0 
' 0018     25 LABEL : Cell Value, String Constant - RelMVccKjv len=0 
' 0018     20 LABEL : Cell Value, String Constant - rZnad len=0 
' 0018     22 LABEL : Cell Value, String Constant - tdIxNWS len=0 
' 0018     26 LABEL : Cell Value, String Constant - uBaWHTIrepn len=0 
' 0018     20 LABEL : Cell Value, String Constant - YINjj len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZmULnrju len=0 
' 0018     21 LABEL : Cell Value, String Constant - zQMyfK 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  
... (truncated)

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