Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f066c53e51696ad0…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:39:14 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 2fbc951bad4f863a1790b94e361108c7 SHA-1: f5a9004f4baca8bb050d53abafc6dc703050bc72 SHA-256: f066c53e51696ad0c9fc29da5ac205c60785ba23c2128e81dd962564e733f4b8
140 Risk Score

Malware Insights

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

The file is an Excel spreadsheet containing Excel 4.0 macros, specifically an Auto_Open function. This function is designed to execute arbitrary commands upon opening the document, indicating a malicious intent to run unauthorized code. The presence of dangerous formula APIs further supports this assessment.

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) 6633 bytes
SHA-256: e1ca2f67bfa244c6e0d994212a832e9cd4e46fc2850c1da84744dae6fec464e6
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  beLnX
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A175 
' 0018     24 LABEL : Cell Value, String Constant - bxyHTnPcr len=0 
' 0018     23 LABEL : Cell Value, String Constant - dfdXdits len=0 
' 0018     22 LABEL : Cell Value, String Constant - DYbLtPZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - FLVpHjzef len=0 
' 0018     21 LABEL : Cell Value, String Constant - GOdjRF len=0 
' 0018     23 LABEL : Cell Value, String Constant - impMZilh len=0 
' 0018     20 LABEL : Cell Value, String Constant - IZZlW len=0 
' 0018     20 LABEL : Cell Value, String Constant - JEIhp len=0 
' 0018     22 LABEL : Cell Value, String Constant - KfAWngu len=0 
' 0018     23 LABEL : Cell Value, String Constant - neoQWbfQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - NMaOiW len=0 
' 0018     23 LABEL : Cell Value, String Constant - NratSAie len=0 
' 0018     22 LABEL : Cell Value, String Constant - PhxaFeB len=0 
' 0018     25 LABEL : Cell Value, String Constant - pYTdIktJcU len=0 
' 0018     26 LABEL : Cell Value, String Constant - SAngDdQEYwY len=0 
' 0018     24 LABEL : Cell Value, String Constant - sKvEtHBVt len=0 
' 0018     20 LABEL : Cell Value, String Constant - ViZNc len=0 
' 0018     20 LABEL : Cell Value, String Constant - xEmoR len=0 
' 0018     22 LABEL : Cell Value, String Constant - YVxfxtF len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZDVnODNB 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     10 LABELSST : Cell Val
... (truncated)

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