Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d0cafe42dd6bbb31…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:46:01 Authoring application: Microsoft Excel First seen: 2021-10-23
MD5: 4e5977c3e5514664d07dd79b07a96744 SHA-1: b23cd78fa8276d02abe21e0b2c93c9cb9d3c9659 SHA-256: d0cafe42dd6bbb31e3bf9bcc8e111229e46fcdbb281da69b6b46503f4e04f22e
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, which is a common method for executing malicious code upon opening an Excel file. The presence of dangerous formula APIs like RUN suggests the macro is designed to download and execute a payload. No specific family could be identified, and no direct IOCs like URLs or hashes were extracted from the macro code itself.

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) 6446 bytes
SHA-256: 2de500f53859834486c63ef4c35e82f37c82fa934a416d54a56bc23ec07921a7
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 -  tNnzg
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E186 
' 0018     21 LABEL : Cell Value, String Constant - cjxWxS len=0 
' 0018     23 LABEL : Cell Value, String Constant - DPEbQIkD len=0 
' 0018     21 LABEL : Cell Value, String Constant - eBnFie len=0 
' 0018     23 LABEL : Cell Value, String Constant - efXnOwYZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - fxReC len=0 
' 0018     26 LABEL : Cell Value, String Constant - gPoHQEwiskA len=0 
' 0018     21 LABEL : Cell Value, String Constant - hiQSRP len=0 
' 0018     26 LABEL : Cell Value, String Constant - oeIsluvTFUl len=0 
' 0018     21 LABEL : Cell Value, String Constant - OkXMZi len=0 
' 0018     22 LABEL : Cell Value, String Constant - PhLdnlh len=0 
' 0018     23 LABEL : Cell Value, String Constant - QaMlLMeM len=0 
' 0018     24 LABEL : Cell Value, String Constant - RcSEgVmrj len=0 
' 0018     24 LABEL : Cell Value, String Constant - sRYhlkMOz len=0 
' 0018     20 LABEL : Cell Value, String Constant - tUCot len=0 
' 0018     20 LABEL : Cell Value, String Constant - VjcER len=0 
' 0018     21 LABEL : Cell Value, String Constant - WgAtZB len=0 
' 0018     20 LABEL : Cell Value, String Constant - WLUrh len=0 
' 0018     25 LABEL : Cell Value, String Constant - wTJTKQDOKv len=0 
' 0018     23 LABEL : Cell Value, String Constant - XEsAwxQv len=0 
' 0018     24 LABEL : Cell Value, String Constant - zCPfELcIj 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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