Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ad7611d223bb6f52…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:47 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: ff606e496db32e6347c1a64d62f5afc7 SHA-1: 79b55425ad6108389a9d473250db4946c45ecbf2 SHA-256: ad7611d223bb6f52a176471b3ab835b334d015d1658710a85f0f0d9f7e6d385d
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file is an Excel 4.0 macro sheet that contains an Auto_Open defined name, indicating it will execute automatically when the workbook is opened. The critical heuristic firing for 'XLM Auto_Open with dangerous formula APIs' suggests the macro attempts to run potentially harmful functions, such as 'RUN'. This is a common technique for initial execution of malicious payloads.

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) 6766 bytes
SHA-256: c7acccf6197f4a62e8e919a46c71b4959d7197ab410223c89c48529f0d372ef1
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 -  DDsMyzeYg
' 0018     25 LABEL : Cell Value, String Constant - aNCzlsedFW len=0 
' 0018     22 LABEL : Cell Value, String Constant - ArofdZT len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F164 
' 0018     20 LABEL : Cell Value, String Constant - CuyaP len=0 
' 0018     24 LABEL : Cell Value, String Constant - DJVnlFcKI len=0 
' 0018     21 LABEL : Cell Value, String Constant - gSThOZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - JhKMLDtve len=0 
' 0018     21 LABEL : Cell Value, String Constant - JtgYGm len=0 
' 0018     21 LABEL : Cell Value, String Constant - KwrLRY len=0 
' 0018     21 LABEL : Cell Value, String Constant - lwFgbv len=0 
' 0018     23 LABEL : Cell Value, String Constant - mMrIXIiN len=0 
' 0018     25 LABEL : Cell Value, String Constant - nngULrXTSF len=0 
' 0018     27 LABEL : Cell Value, String Constant - NTjmuGcZqQZv len=0 
' 0018     24 LABEL : Cell Value, String Constant - OFZAUmylQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - OZUEaFxxV len=0 
' 0018     22 LABEL : Cell Value, String Constant - qJgiqXU len=0 
' 0018     27 LABEL : Cell Value, String Constant - QpSxSqZVzVKE len=0 
' 0018     22 LABEL : Cell Value, String Constant - Rymimfz len=0 
' 0018     20 LABEL : Cell Value, String Constant - TvZXL len=0 
' 0018     26 LABEL : Cell Value, String Constant - UOFRwELuRHj len=0 
' 0018     27 LABEL : Cell Value, String Constant - VDfCwrYXjTfR 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     
... (truncated)

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