Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4d2a3abbd14dca8f…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:18 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: f0ab45b8e9e3b13f8c13dcd9326f8552 SHA-1: c80486e18848f1dec4f0203aa9c54ac271428966 SHA-256: 4d2a3abbd14dca8f20cb44583bd8c502e68fd302252474ba65c26d5e96f37fc1
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 known method for executing malicious code upon opening the document. The macro sheet contains a dangerous formula API call, suggesting it's designed to download and execute a payload. No specific family could be identified from the available 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) 6770 bytes
SHA-256: 3f8f42b41c748f3631e51bbcd8b7fe568937d171138c9fa192a6602e0386f1df
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 -  NSQnLBaeV
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A151 
' 0018     26 LABEL : Cell Value, String Constant - cmpzrbypNuK len=0 
' 0018     24 LABEL : Cell Value, String Constant - dbljOUDtV len=0 
' 0018     27 LABEL : Cell Value, String Constant - DdrQMEjKPfHI len=0 
' 0018     20 LABEL : Cell Value, String Constant - dGqZW len=0 
' 0018     20 LABEL : Cell Value, String Constant - FYrrC len=0 
' 0018     24 LABEL : Cell Value, String Constant - getlsZWAq len=0 
' 0018     22 LABEL : Cell Value, String Constant - gzYkWou len=0 
' 0018     21 LABEL : Cell Value, String Constant - hBJpqh len=0 
' 0018     21 LABEL : Cell Value, String Constant - kxKNIY len=0 
' 0018     21 LABEL : Cell Value, String Constant - LFzJLK len=0 
' 0018     26 LABEL : Cell Value, String Constant - MbwZsntAcGO len=0 
' 0018     27 LABEL : Cell Value, String Constant - mfcRjxhvNFhF len=0 
' 0018     22 LABEL : Cell Value, String Constant - Nwdqvkc len=0 
' 0018     23 LABEL : Cell Value, String Constant - oteBXGAZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - RqeSfRY len=0 
' 0018     23 LABEL : Cell Value, String Constant - VdokEfDq len=0 
' 0018     25 LABEL : Cell Value, String Constant - XvnQPUnDAA len=0 
' 0018     24 LABEL : Cell Value, String Constant - yqvbsXbFT len=0 
' 0018     21 LABEL : Cell Value, String Constant - zbHuqq len=0 
' 0018     26 LABEL : Cell Value, String Constant - zemXoEyhPgp 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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