Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3d0e3588c672e62c…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:44:00 Authoring application: Microsoft Excel First seen: 2021-07-02
MD5: a5769971eced71564044cc25b2e47eca SHA-1: 58f636dedd6a5d372c07f47a465804615255aa3c SHA-256: 3d0e3588c672e62cb01689cd8b601b1bfe9476ee865cf9d3827b13c468634bc9
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open defined name, which is a critical finding indicating automatic execution. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code. While the exact payload is not discernible from the provided evidence, the mechanism points to a downloader or initial execution stage.

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) 6695 bytes
SHA-256: 8d4889ab9ac7f214fbc855e976775d1babc35011713f160302cb9c826fb2d313
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  jaOhbq
' 0018     27 LABEL : Cell Value, String Constant - AaYKXDBfVdMn len=0 
' 0018     23 LABEL : Cell Value, String Constant - anGTaJKR len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I142 
' 0018     27 LABEL : Cell Value, String Constant - BKAeIYFQpldA len=0 
' 0018     21 LABEL : Cell Value, String Constant - bkvsqZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - cIaCDxk len=0 
' 0018     24 LABEL : Cell Value, String Constant - cLvkDMccQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - CPuXDKQBk len=0 
' 0018     23 LABEL : Cell Value, String Constant - DpAdiaAH len=0 
' 0018     23 LABEL : Cell Value, String Constant - FjOtkMSo len=0 
' 0018     27 LABEL : Cell Value, String Constant - HcbbgkZTwDZn len=0 
' 0018     24 LABEL : Cell Value, String Constant - HQntZrBzo len=0 
' 0018     23 LABEL : Cell Value, String Constant - IaOTYKTN len=0 
' 0018     26 LABEL : Cell Value, String Constant - IdnQYYCSKlB len=0 
' 0018     21 LABEL : Cell Value, String Constant - KaAjnR len=0 
' 0018     26 LABEL : Cell Value, String Constant - KYCjwCYZpIt len=0 
' 0018     23 LABEL : Cell Value, String Constant - NUVaaLMV len=0 
' 0018     27 LABEL : Cell Value, String Constant - PdMuwQCHKpKz len=0 
' 0018     24 LABEL : Cell Value, String Constant - pswtVGKye len=0 
' 0018     22 LABEL : Cell Value, String Constant - SaffGbG len=0 
' 0018     20 LABEL : Cell Value, String Constant - xjast 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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