Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 852bde3e375e2a6d…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-27 11:43:44 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 33e73c9d3e5fb7eea9bc0bf29ca6b25c SHA-1: 4cf141e9bd613585e5031d1a8955ebe35bc77662 SHA-256: 852bde3e375e2a6daf21e44d8339b3b17c79bcc828026f18cff66890b0448a8b
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. Static analysis detected an Auto_Open defined name, indicating that a macro will execute automatically upon opening the workbook. The presence of dangerous formula APIs within the macro sheet suggests an intent to execute arbitrary code, likely to download and run a secondary 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) 6598 bytes
SHA-256: 05bc13551c9b109ebc578dec2764109dc7f878a431f604b762a23f3155b433e5
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  uQBE
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B142 
' 0018     21 LABEL : Cell Value, String Constant - BEmYDo len=0 
' 0018     22 LABEL : Cell Value, String Constant - BjntrdL len=0 
' 0018     26 LABEL : Cell Value, String Constant - BuIXSYALJLJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - cAhYKBDbALAi len=0 
' 0018     20 LABEL : Cell Value, String Constant - DUWwW len=0 
' 0018     24 LABEL : Cell Value, String Constant - EQpMSRixl len=0 
' 0018     26 LABEL : Cell Value, String Constant - gJlpdPxrGCa len=0 
' 0018     23 LABEL : Cell Value, String Constant - GteQZTmy len=0 
' 0018     27 LABEL : Cell Value, String Constant - HljQhwUiOthI len=0 
' 0018     25 LABEL : Cell Value, String Constant - IBxvYOFPeO len=0 
' 0018     22 LABEL : Cell Value, String Constant - katOtst len=0 
' 0018     24 LABEL : Cell Value, String Constant - KWFMSFwnJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - MknLkfrWDdxq len=0 
' 0018     20 LABEL : Cell Value, String Constant - rdhKl len=0 
' 0018     20 LABEL : Cell Value, String Constant - sqcWi len=0 
' 0018     26 LABEL : Cell Value, String Constant - wqmpCbZWyZX len=0 
' 0018     26 LABEL : Cell Value, String Constant - WQsgIbLoYZz len=0 
' 0018     21 LABEL : Cell Value, String Constant - xsPuuq len=0 
' 0018     25 LABEL : Cell Value, String Constant - yHIiGOllgX len=0 
' 0018     22 LABEL : Cell Value, String Constant - yKJAyar 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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