Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 20b493b1345f46ab…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:40:47 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 3872c31cc0f93a90d77b8fd5d7ec67c1 SHA-1: 5df639184b6e7ea4ebf6fb062c4123e296cc3077 SHA-256: 20b493b1345f46ab52bd9bf1b9d91a4ded50ba041dc023fcef26802cd0297417
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding indicating potential malicious execution. The presence of dangerous formula APIs like RUN further supports this. The macro sheet is likely designed to execute arbitrary code upon opening the workbook.

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) 6624 bytes
SHA-256: 6efe67cb96f49072c0c3efce1313204c3132c917f4b23a6c8373b53736cbe578
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  KoaXaCPdno
' 0018     25 LABEL : Cell Value, String Constant - ABtcIdMyju len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D190 
' 0018     20 LABEL : Cell Value, String Constant - bGMFr len=0 
' 0018     22 LABEL : Cell Value, String Constant - cERDaJF len=0 
' 0018     26 LABEL : Cell Value, String Constant - dnWLLwNxTwN len=0 
' 0018     20 LABEL : Cell Value, String Constant - dsRZq len=0 
' 0018     27 LABEL : Cell Value, String Constant - gDkzsKeqZLdu len=0 
' 0018     21 LABEL : Cell Value, String Constant - HXvYax len=0 
' 0018     27 LABEL : Cell Value, String Constant - iFCBWUUFgnek len=0 
' 0018     26 LABEL : Cell Value, String Constant - IhaqmRRaXfn len=0 
' 0018     20 LABEL : Cell Value, String Constant - IIuBP len=0 
' 0018     25 LABEL : Cell Value, String Constant - KRkrdzhgEK len=0 
' 0018     25 LABEL : Cell Value, String Constant - LKRQSPsrkv len=0 
' 0018     20 LABEL : Cell Value, String Constant - nNnYn len=0 
' 0018     20 LABEL : Cell Value, String Constant - OHJSc len=0 
' 0018     26 LABEL : Cell Value, String Constant - OmFTKbTJYxv len=0 
' 0018     24 LABEL : Cell Value, String Constant - PRbFodnTB len=0 
' 0018     27 LABEL : Cell Value, String Constant - qQiFClfqCsJe len=0 
' 0018     20 LABEL : Cell Value, String Constant - rwXgH len=0 
' 0018     27 LABEL : Cell Value, String Constant - WyAFyPQMTmnj len=0 
' 0018     27 LABEL : Cell Value, String Constant - YXaWEemuhUNl 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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