Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 62ed484f78110fce…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:43:23 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: 74cb9538bf5016520b19c81558c46806 SHA-1: 579f20ce4a19fdca223327583b2537d2199553e5 SHA-256: 62ed484f78110fce06b060c45b67bdc58a705e5f64d5703571f20046797223f4
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding indicating automatic execution upon opening. The presence of dangerous formula APIs within the macro sheet further suggests malicious intent. While the exact payload is not discernible from the provided evidence, the Auto_Open function is designed to execute arbitrary code, likely leading to further compromise.

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) 6891 bytes
SHA-256: ced202c4f8b9698bb4ddf7e57d8b0648250487f7c80777833fb8bbace165241c
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 -  WFOLUmbcXqC
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D166 
' 0018     24 LABEL : Cell Value, String Constant - dGGOYvYzz len=0 
' 0018     21 LABEL : Cell Value, String Constant - DTnRDO len=0 
' 0018     26 LABEL : Cell Value, String Constant - ezLltrmlYbi len=0 
' 0018     23 LABEL : Cell Value, String Constant - FKhHpGfB len=0 
' 0018     24 LABEL : Cell Value, String Constant - fKLjvGFOF len=0 
' 0018     23 LABEL : Cell Value, String Constant - GCOFftZN len=0 
' 0018     20 LABEL : Cell Value, String Constant - hRWOn len=0 
' 0018     24 LABEL : Cell Value, String Constant - IXoZrBtlf len=0 
' 0018     22 LABEL : Cell Value, String Constant - KUBxUaI len=0 
' 0018     22 LABEL : Cell Value, String Constant - nDIAcWP len=0 
' 0018     27 LABEL : Cell Value, String Constant - NPjzKpZGJiux len=0 
' 0018     26 LABEL : Cell Value, String Constant - OXpaTBHgTps len=0 
' 0018     20 LABEL : Cell Value, String Constant - sDbBK len=0 
' 0018     21 LABEL : Cell Value, String Constant - tMNQjV len=0 
' 0018     24 LABEL : Cell Value, String Constant - UsBcLekRo len=0 
' 0018     24 LABEL : Cell Value, String Constant - wjQsqtRcL len=0 
' 0018     23 LABEL : Cell Value, String Constant - XrrnHGNN len=0 
' 0018     27 LABEL : Cell Value, String Constant - YdeXvGLYvgHn len=0 
' 0018     20 LABEL : Cell Value, String Constant - yDwTD len=0 
' 0018     24 LABEL : Cell Value, String Constant - yzfqTdZpf 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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