Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3d04304e2f008d5c…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:45:36 Authoring application: Microsoft Excel First seen: 2021-07-02
MD5: 7b94e970f2514082ec00fc0b11a8683e SHA-1: 06d03ebf41cde2836ec8be5c10aa3de96455fe21 SHA-256: 3d04304e2f008d5c86bedc5f263b055d87dea7a69bf667dc762e0934b643d8a0
140 Risk Score

Malware Insights

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

The file contains critical heuristic firings indicating the presence of Excel 4.0 macros with an Auto_Open entry and dangerous formula APIs, specifically the RUN function. This suggests the macro is designed to execute arbitrary code upon opening the document. The extensive obfuscated data in the document body further supports the malicious intent, likely to conceal a payload download or execution routine.

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) 6872 bytes
SHA-256: 1a2e8c1830f6a4c4de969c10b0024a684cbd9009bc23a47ac41a8d9bc884305a
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 -  BJictLEUkhm
' 0018     27 LABEL : Cell Value, String Constant - antzayTLmPLC len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G171 
' 0018     27 LABEL : Cell Value, String Constant - aVIrTjuHQlkQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - BAAyjyqYZAR len=0 
' 0018     20 LABEL : Cell Value, String Constant - cQuFP len=0 
' 0018     25 LABEL : Cell Value, String Constant - CuqOapaBDV len=0 
' 0018     25 LABEL : Cell Value, String Constant - EglriJjgtS len=0 
' 0018     24 LABEL : Cell Value, String Constant - ehoMejEol len=0 
' 0018     24 LABEL : Cell Value, String Constant - FtVLLXzPt len=0 
' 0018     25 LABEL : Cell Value, String Constant - MOvIgIrYwb len=0 
' 0018     21 LABEL : Cell Value, String Constant - pChlfp len=0 
' 0018     24 LABEL : Cell Value, String Constant - pPZIBSLaQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - rghnW len=0 
' 0018     25 LABEL : Cell Value, String Constant - UFdOdDGCTx len=0 
' 0018     24 LABEL : Cell Value, String Constant - UnrvYbncV len=0 
' 0018     24 LABEL : Cell Value, String Constant - uxNVWUXmF len=0 
' 0018     23 LABEL : Cell Value, String Constant - VqyudWGs len=0 
' 0018     22 LABEL : Cell Value, String Constant - WcMnRLa len=0 
' 0018     21 LABEL : Cell Value, String Constant - XdsrVB len=0 
' 0018     24 LABEL : Cell Value, String Constant - zbOtyRuUF len=0 
' 0018     21 LABEL : Cell Value, String Constant - zrQLtS 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
' 0
... (truncated)

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