Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6f35a4aaa9e0cee9…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:40:44 Authoring application: Microsoft Excel First seen: 2021-10-07
MD5: 1277811b5a327c67dec4b4d270fd9273 SHA-1: f48731c4ba1e676f4ff9580f6ccf5f4bf6342d42 SHA-256: 6f35a4aaa9e0cee9b509902dc098402ef5da0834ae89e182492bcaddc6c6bb0d
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled document detected with critical heuristics for OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN. The Auto_Open macro is present and uses dangerous formula APIs, indicating an attempt to execute arbitrary code upon opening. The specific dangerous function identified is 'RUN', suggesting the macro is designed to launch an external process or payload.

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) 6743 bytes
SHA-256: f6216e3b4eb6db72e6c017cb6606dfe7348c0179447df410762207a96665eb2b
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  PINJTWN
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D203 
' 0018     24 LABEL : Cell Value, String Constant - cVDToMVRi len=0 
' 0018     23 LABEL : Cell Value, String Constant - CYMaNtKP len=0 
' 0018     25 LABEL : Cell Value, String Constant - DYolibUKIA len=0 
' 0018     25 LABEL : Cell Value, String Constant - esmEcgYpEO len=0 
' 0018     24 LABEL : Cell Value, String Constant - GDgWFIzTa len=0 
' 0018     27 LABEL : Cell Value, String Constant - HZxEcFdqLGNp len=0 
' 0018     25 LABEL : Cell Value, String Constant - IdxdzBmDzj len=0 
' 0018     21 LABEL : Cell Value, String Constant - kpMnsj len=0 
' 0018     24 LABEL : Cell Value, String Constant - lPycmkaBF len=0 
' 0018     21 LABEL : Cell Value, String Constant - lQrSby len=0 
' 0018     27 LABEL : Cell Value, String Constant - OmkvgQMUPXuR len=0 
' 0018     20 LABEL : Cell Value, String Constant - PArsh len=0 
' 0018     27 LABEL : Cell Value, String Constant - qOalWxycsSUn len=0 
' 0018     22 LABEL : Cell Value, String Constant - qrpbNkI len=0 
' 0018     23 LABEL : Cell Value, String Constant - QtuGnEFG len=0 
' 0018     25 LABEL : Cell Value, String Constant - RBgSZvkpEQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - sFfxUJv len=0 
' 0018     23 LABEL : Cell Value, String Constant - VUJLilZq len=0 
' 0018     20 LABEL : Cell Value, String Constant - WtgTE len=0 
' 0018     27 LABEL : Cell Value, String Constant - YAzQATYKEddb 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
' 00
... (truncated)

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