Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 867b3bbdd2132e52…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:00 Authoring application: Microsoft Excel First seen: 2021-10-04
MD5: 7458bbe09eab1b00b32238a15df405fe SHA-1: e14fed9d3025944f2d3af89899811856c6789464 SHA-256: 867b3bbdd2132e52e87ccfb1321d6b554281ae0d2ee1b34987457739c437f6ce
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook. Heuristics indicate the presence of an Auto_Open macro and the use of dangerous formula APIs, specifically the RUN function. This suggests the macro is designed to execute arbitrary code upon opening, likely to download and run a secondary payload. No specific family could be identified.

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) 6509 bytes
SHA-256: 9973ed85e46f47009185158c905a2dbb8a26c781a173823c88da12cac279432b
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 -  jzjio
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C142 
' 0018     26 LABEL : Cell Value, String Constant - bnimvThgtkA len=0 
' 0018     27 LABEL : Cell Value, String Constant - DBhasFjzPAxq len=0 
' 0018     24 LABEL : Cell Value, String Constant - fTVDvDDmV len=0 
' 0018     20 LABEL : Cell Value, String Constant - FzfiK len=0 
' 0018     25 LABEL : Cell Value, String Constant - jlWPcfTgiQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - jPDGZKfjGCZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - kCSCPcQXrYr len=0 
' 0018     24 LABEL : Cell Value, String Constant - kgslRKIcl len=0 
' 0018     27 LABEL : Cell Value, String Constant - KOwWAGXbnlJr len=0 
' 0018     25 LABEL : Cell Value, String Constant - kqhqWzOeLL len=0 
' 0018     26 LABEL : Cell Value, String Constant - KUPMZsvAvUe len=0 
' 0018     27 LABEL : Cell Value, String Constant - kWFUVEpFGTUb len=0 
' 0018     25 LABEL : Cell Value, String Constant - LBjJAnYvUG len=0 
' 0018     23 LABEL : Cell Value, String Constant - onqOqmPX len=0 
' 0018     26 LABEL : Cell Value, String Constant - SjkfFgQODlz len=0 
' 0018     23 LABEL : Cell Value, String Constant - TMpiFtJF len=0 
' 0018     23 LABEL : Cell Value, String Constant - VUBKwYzp len=0 
' 0018     23 LABEL : Cell Value, String Constant - WgANFvQX len=0 
' 0018     25 LABEL : Cell Value, String Constant - YhdQePoMSL len=0 
' 0018     27 LABEL : Cell Value, String Constant - zXsNHVNBthLG 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, Stri
... (truncated)

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