Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 47227d1d3f5e1a8b…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:41:54 Authoring application: Microsoft Excel First seen: 2021-10-14
MD5: 5975dbd54c679456ef0be55b24eecafb SHA-1: b98635c950c33e52833fd53037d0b69190f72c74 SHA-256: 47227d1d3f5e1a8b7fcc1b4c1b1e07fc6887d14b3c75a11de5f7307a17a49913
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-enabled workbook. Heuristics indicate the presence of an Auto_Open macro that uses dangerous formula APIs, suggesting it is designed to execute arbitrary code. This is a common technique for downloading and executing further malicious content.

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) 6695 bytes
SHA-256: 59480ad206e4b09dbab2754cc44be6541d09af303925021672c9f0fd2f681e4b
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  tsHUYG
' 0018     22 LABEL : Cell Value, String Constant - aguHYCX len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G162 
' 0018     27 LABEL : Cell Value, String Constant - BAgoMaUzpqOH len=0 
' 0018     20 LABEL : Cell Value, String Constant - cUcBa len=0 
' 0018     26 LABEL : Cell Value, String Constant - DtAzApYsOTO len=0 
' 0018     26 LABEL : Cell Value, String Constant - FXzGyEuLLKs len=0 
' 0018     26 LABEL : Cell Value, String Constant - hbSbnoRylKf len=0 
' 0018     22 LABEL : Cell Value, String Constant - hQGofob len=0 
' 0018     20 LABEL : Cell Value, String Constant - iWJEW len=0 
' 0018     25 LABEL : Cell Value, String Constant - kKlYLXFzsk len=0 
' 0018     24 LABEL : Cell Value, String Constant - KOFVSjCeq len=0 
' 0018     26 LABEL : Cell Value, String Constant - LjYeitZYkyP len=0 
' 0018     22 LABEL : Cell Value, String Constant - NheyBjN len=0 
' 0018     27 LABEL : Cell Value, String Constant - QopbFvspHHfy len=0 
' 0018     21 LABEL : Cell Value, String Constant - rRbYHH len=0 
' 0018     25 LABEL : Cell Value, String Constant - uZsRoqQdnH len=0 
' 0018     21 LABEL : Cell Value, String Constant - VDCDHP len=0 
' 0018     26 LABEL : Cell Value, String Constant - WfnExcbrNUs len=0 
' 0018     27 LABEL : Cell Value, String Constant - WFPhdQvVQEAe len=0 
' 0018     27 LABEL : Cell Value, String Constant - ygbRlPvDfXNI len=0 
' 0018     21 LABEL : Cell Value, String Constant - zZaGEc 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
... (truncated)

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