Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ef9090bbd4bc6c51…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:22 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 9df15cfae1a456675d5488ee0ef91da5 SHA-1: d3d9785833c530fe2de8c7ca67b0dede0b364860 SHA-256: ef9090bbd4bc6c518f1ddcc97ed6f1d96b853fcaa02e0032430507824d1398a7
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 workbook containing an Auto_Open defined name, which is a critical indicator of malicious intent. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code, likely downloading and running a second-stage 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) 6870 bytes
SHA-256: c6d0c19ad07c43672f44578ac066c43d671ac48cfc85457cd243189001b44311
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  YZEsXlSPkw
' 0018     22 LABEL : Cell Value, String Constant - ANnrPlJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D187 
' 0018     25 LABEL : Cell Value, String Constant - DEJWmQHjoU len=0 
' 0018     25 LABEL : Cell Value, String Constant - dxPFlHQwND len=0 
' 0018     26 LABEL : Cell Value, String Constant - fPZZafgMKaf len=0 
' 0018     20 LABEL : Cell Value, String Constant - gblhJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - HiDzBeVLCSY len=0 
' 0018     22 LABEL : Cell Value, String Constant - hliVJvE len=0 
' 0018     26 LABEL : Cell Value, String Constant - JnpcVWNJBJG len=0 
' 0018     24 LABEL : Cell Value, String Constant - lShKJdvWZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - MNOeWeKjJZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - SKvMB len=0 
' 0018     20 LABEL : Cell Value, String Constant - SmbLc len=0 
' 0018     22 LABEL : Cell Value, String Constant - suRwxjZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - SVwdJtzfYbd len=0 
' 0018     25 LABEL : Cell Value, String Constant - sYYYuKyHKc len=0 
' 0018     24 LABEL : Cell Value, String Constant - SzLevvCah len=0 
' 0018     27 LABEL : Cell Value, String Constant - TQvwgIrFnguC len=0 
' 0018     25 LABEL : Cell Value, String Constant - uBgOxscdMY len=0 
' 0018     27 LABEL : Cell Value, String Constant - XfafjvSRpfcP len=0 
' 0018     23 LABEL : Cell Value, String Constant - zNJRHEsG 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/ 
... (truncated)

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