Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 237c9d9aa90f292e…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:26 Authoring application: Microsoft Excel First seen: 2021-07-02
MD5: 302d0f0e778f6109071564258dc87e5c SHA-1: 24fdd7ee9738e3d0c35eb57ecef5323969271df3 SHA-256: 237c9d9aa90f292e234ac3fa5f46a97687a51a2300a8bbcab6049f14a25d686a
140 Risk Score

Malware Insights

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

This Excel file contains Excel 4.0 macros, specifically an Auto_Open function, which is a known method for executing malicious code. The critical heuristic firings indicate the presence of dangerous formula APIs within the Auto_Open macro, suggesting it is designed to run arbitrary commands. No specific malware family is identifiable from the provided evidence.

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) 6440 bytes
SHA-256: eaca127894a51dcd8b6e2b859347029c2c7321d640e3ec383f67db50b13005af
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  zUN
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H156 
' 0018     24 LABEL : Cell Value, String Constant - bVPzdhzEc len=0 
' 0018     22 LABEL : Cell Value, String Constant - CgFrsnI len=0 
' 0018     23 LABEL : Cell Value, String Constant - CTBQBZHK len=0 
' 0018     24 LABEL : Cell Value, String Constant - dLMUTZEOW len=0 
' 0018     22 LABEL : Cell Value, String Constant - fppvAvM len=0 
' 0018     27 LABEL : Cell Value, String Constant - fYdsjNVPhZQC len=0 
' 0018     23 LABEL : Cell Value, String Constant - IHekbFGG len=0 
' 0018     21 LABEL : Cell Value, String Constant - jmEMOp len=0 
' 0018     22 LABEL : Cell Value, String Constant - jywamMT len=0 
' 0018     20 LABEL : Cell Value, String Constant - KnDKs len=0 
' 0018     22 LABEL : Cell Value, String Constant - NCrGKEu len=0 
' 0018     26 LABEL : Cell Value, String Constant - neDkfFgTLMt len=0 
' 0018     21 LABEL : Cell Value, String Constant - noaOCK len=0 
' 0018     26 LABEL : Cell Value, String Constant - QIqTRijgsyO len=0 
' 0018     21 LABEL : Cell Value, String Constant - rHpRJJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - RxZzzrGWMRf len=0 
' 0018     26 LABEL : Cell Value, String Constant - UMgOEwVzseV len=0 
' 0018     24 LABEL : Cell Value, String Constant - XwnRJpxQe len=0 
' 0018     26 LABEL : Cell Value, String Constant - YNnyTQBgkTR len=0 
' 0018     25 LABEL : Cell Value, String Constant - YSQsnHfiVF 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     1
... (truncated)

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