Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a6d6e202f59b46eb…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:52 Authoring application: Microsoft Excel First seen: 2021-07-10
MD5: c0f6176599f948c292c0b041ec830b8f SHA-1: a184c62a7863a9c727ca7c8bc0aab163b4b0aaf1 SHA-256: a6d6e202f59b46ebd18b72bf134c692cbbe3028bb25ffc40afe9722fbb35b72e
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open defined name, which is a critical indicator of malicious intent. This technique is often used to execute arbitrary code upon opening the document, serving as a common method for initial access through spearphishing attachments. The macro sheet contains references to dangerous formula APIs, further supporting its malicious nature.

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) 6617 bytes
SHA-256: 2125fde2f99d2a5948ffe7162f1599c68c6eff76679cb461482b282d4f78c92a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  NzmtBXeMcz
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C171 
' 0018     25 LABEL : Cell Value, String Constant - aYEGpIALwp len=0 
' 0018     23 LABEL : Cell Value, String Constant - aYoNYCOu len=0 
' 0018     27 LABEL : Cell Value, String Constant - azuoDmhTqErj len=0 
' 0018     22 LABEL : Cell Value, String Constant - DjVcRlv len=0 
' 0018     27 LABEL : Cell Value, String Constant - eSGUEyAIeona len=0 
' 0018     22 LABEL : Cell Value, String Constant - FgXQvbr len=0 
' 0018     20 LABEL : Cell Value, String Constant - GQGEG len=0 
' 0018     20 LABEL : Cell Value, String Constant - hoKlo len=0 
' 0018     23 LABEL : Cell Value, String Constant - jCSIvSpj len=0 
' 0018     26 LABEL : Cell Value, String Constant - KNQOoizqgcm len=0 
' 0018     20 LABEL : Cell Value, String Constant - lJLgd len=0 
' 0018     21 LABEL : Cell Value, String Constant - lKqRSi len=0 
' 0018     20 LABEL : Cell Value, String Constant - Nondn len=0 
' 0018     25 LABEL : Cell Value, String Constant - NvrfTHLyio len=0 
' 0018     20 LABEL : Cell Value, String Constant - OCJjg len=0 
' 0018     23 LABEL : Cell Value, String Constant - oyadRtiu len=0 
' 0018     25 LABEL : Cell Value, String Constant - RzPacblszs len=0 
' 0018     27 LABEL : Cell Value, String Constant - TKGqpAuoObtB len=0 
' 0018     25 LABEL : Cell Value, String Constant - XOqguvBMnt len=0 
' 0018     27 LABEL : Cell Value, String Constant - zupwNonABPyQ 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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