Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 119e39b1e0b0ff23…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:05 Authoring application: Microsoft Excel First seen: 2021-10-23
MD5: af594fcaec316aac3419a499e99a2fe4 SHA-1: 645a88da4f1f9500b34e48140d11c2fc36a28514 SHA-256: 119e39b1e0b0ff2300e01a6591d16f78def57d6df38d0b935545e1505d1d5e16
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file contains Excel 4.0 macros, specifically an Auto_Open function, which is a known method for executing malicious code within Office documents. The critical heuristics indicate the presence of dangerous formula APIs within the Auto_Open macro, suggesting an attempt to download and execute a secondary payload. The lack of specific IOCs like URLs or executable strings means the exact nature of the payload cannot be determined from this analysis alone.

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) 6711 bytes
SHA-256: 6fe0ea5013052e1b6213cc006b5d8df56ab74e901268fef6a260e63eb2c1fef4
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 -  FJSiNGO
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A134 
' 0018     23 LABEL : Cell Value, String Constant - bjEwXfPa len=0 
' 0018     26 LABEL : Cell Value, String Constant - cMIuGQZLdAg len=0 
' 0018     23 LABEL : Cell Value, String Constant - CsxWrRmW len=0 
' 0018     26 LABEL : Cell Value, String Constant - eALylqxWCNE len=0 
' 0018     22 LABEL : Cell Value, String Constant - FjPuIWM len=0 
' 0018     22 LABEL : Cell Value, String Constant - GsNhbvm len=0 
' 0018     20 LABEL : Cell Value, String Constant - HuCpd len=0 
' 0018     25 LABEL : Cell Value, String Constant - khuQYcvrGb len=0 
' 0018     23 LABEL : Cell Value, String Constant - kzUNXQIk len=0 
' 0018     24 LABEL : Cell Value, String Constant - LMJVcneBg len=0 
' 0018     23 LABEL : Cell Value, String Constant - mJPWlzrb len=0 
' 0018     24 LABEL : Cell Value, String Constant - OjDOJrHQw len=0 
' 0018     25 LABEL : Cell Value, String Constant - OPTdCNVEqF len=0 
' 0018     24 LABEL : Cell Value, String Constant - qQdUutqrE len=0 
' 0018     27 LABEL : Cell Value, String Constant - RyzkdHJTLzlW len=0 
' 0018     25 LABEL : Cell Value, String Constant - VBSwKiOhBy len=0 
' 0018     25 LABEL : Cell Value, String Constant - VlvDTCahmV len=0 
' 0018     26 LABEL : Cell Value, String Constant - wGXGeBmhkik len=0 
' 0018     23 LABEL : Cell Value, String Constant - WosXrZGG len=0 
' 0018     21 LABEL : Cell Value, String Constant - yFPScS 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
' 
... (truncated)

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