Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6a14dc3f6b8a531d…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:02 Authoring application: Microsoft Excel First seen: 2021-10-02
MD5: 3687898b2b909ef54229aeacb87c474f SHA-1: 71c35331dc708b6caaf2f3a46c1c3cf72275dcfe SHA-256: 6a14dc3f6b8a531d6f702bfa35701151b6c2e0b42e3a39ff6cedb58536572284
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 function, which is a common technique for executing malicious code upon opening the document. The macro sheet contains dangerous formula APIs, suggesting it's designed to perform actions beyond typical spreadsheet operations. No specific URLs or executable payloads were directly extracted, but the Auto_Open macro is the primary indicator of malicious intent.

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) 6823 bytes
SHA-256: 0c455fab69d867f24cb68c2cf95cc3731c565695ccb1171c9fbf2886ae6d430e
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 -  WrTElwqsXIE
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I157 
' 0018     20 LABEL : Cell Value, String Constant - aVtQn len=0 
' 0018     24 LABEL : Cell Value, String Constant - btxyVadPS len=0 
' 0018     24 LABEL : Cell Value, String Constant - dKeojyqDa len=0 
' 0018     20 LABEL : Cell Value, String Constant - DpIlh len=0 
' 0018     22 LABEL : Cell Value, String Constant - eXIHILf len=0 
' 0018     23 LABEL : Cell Value, String Constant - ghHqSbHQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - hcvaRYsb len=0 
' 0018     25 LABEL : Cell Value, String Constant - HkiWGaxUZe len=0 
' 0018     20 LABEL : Cell Value, String Constant - jhJlX len=0 
' 0018     20 LABEL : Cell Value, String Constant - KeaoK len=0 
' 0018     24 LABEL : Cell Value, String Constant - mngQRaNKA len=0 
' 0018     25 LABEL : Cell Value, String Constant - OgqQVWsTyY len=0 
' 0018     22 LABEL : Cell Value, String Constant - OnjGLJQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - OzsQkWfNBQtk len=0 
' 0018     27 LABEL : Cell Value, String Constant - PoQssCYDNlIc len=0 
' 0018     22 LABEL : Cell Value, String Constant - QANgoYT len=0 
' 0018     21 LABEL : Cell Value, String Constant - tdCeaZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - UXQSB len=0 
' 0018     22 LABEL : Cell Value, String Constant - vdCgRFN len=0 
' 0018     26 LABEL : Cell Value, String Constant - vtTSuRYupwe 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     10 LABE
... (truncated)

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