Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0fa046fd72cc138d…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:25 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: d56d0653b5a6f81e8524668de4f6e172 SHA-1: d59c818d7701e414b28bbd39614a514ecbdbbf00 SHA-256: 0fa046fd72cc138dacb40fd3c35a026db3a723ade842442307ec6851fab4f48f
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. This indicates that the macro sheet is configured to automatically execute when the workbook is opened. The presence of dangerous formula APIs within the Auto_Open macro suggests it is designed to run arbitrary commands, likely to download and execute a secondary payload.

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) 6634 bytes
SHA-256: fc65b6dd8408c059bc131a625568a17b6a2138846d92dff0419077120a0a0277
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 -  nokzf
' 0018     23 LABEL : Cell Value, String Constant - ADmSePCj len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E170 
' 0018     24 LABEL : Cell Value, String Constant - BWuEaxUQK len=0 
' 0018     23 LABEL : Cell Value, String Constant - DdyJoZod len=0 
' 0018     22 LABEL : Cell Value, String Constant - EXwpfMO len=0 
' 0018     25 LABEL : Cell Value, String Constant - hqWMtnozzF len=0 
' 0018     25 LABEL : Cell Value, String Constant - HZqaNRYAZg len=0 
' 0018     23 LABEL : Cell Value, String Constant - iiNwcqBH len=0 
' 0018     27 LABEL : Cell Value, String Constant - ijEnxPIkalCS len=0 
' 0018     21 LABEL : Cell Value, String Constant - mZxtZC len=0 
' 0018     22 LABEL : Cell Value, String Constant - OPtHenR len=0 
' 0018     27 LABEL : Cell Value, String Constant - QkGctLlqtZwR len=0 
' 0018     20 LABEL : Cell Value, String Constant - qtVJY len=0 
' 0018     26 LABEL : Cell Value, String Constant - RQFVXfvUcyX len=0 
' 0018     21 LABEL : Cell Value, String Constant - rymOSB len=0 
' 0018     25 LABEL : Cell Value, String Constant - SKbrMQFrma len=0 
' 0018     26 LABEL : Cell Value, String Constant - SZqTBzpxHsR len=0 
' 0018     23 LABEL : Cell Value, String Constant - WgXemywy len=0 
' 0018     25 LABEL : Cell Value, String Constant - WRwPhGWoaB len=0 
' 0018     23 LABEL : Cell Value, String Constant - xzuxEdNf len=0 
' 0018     20 LABEL : Cell Value, String Constant - YyEip 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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