Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 929d7bf39707841b…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:03 Authoring application: Microsoft Excel First seen: 2021-05-23
MD5: d3e9420ba8c7379b6a60b9fc42997010 SHA-1: 634bc9cc2bf73914fdde7acdd7c6f7d5954e59c6 SHA-256: 929d7bf39707841bf4c56d63b33440025dd959445372791bbbc6434ccd66e920
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding indicating potential for arbitrary code execution. The presence of dangerous formula APIs like RUN further supports this. The macro sheet itself contains obfuscated data, suggesting an attempt to hide malicious functionality. The primary purpose appears to be executing a secondary payload via the macro.

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) 6742 bytes
SHA-256: 009c27bb5867f75fe4a6adca6709efe09a315ff1cbdebbe3a1c2a6e60ebc0642
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  NHexNmrgJ
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C178 
' 0018     25 LABEL : Cell Value, String Constant - BGtXAAZrrI len=0 
' 0018     22 LABEL : Cell Value, String Constant - CtbcdLB len=0 
' 0018     23 LABEL : Cell Value, String Constant - dGKPGVdb len=0 
' 0018     24 LABEL : Cell Value, String Constant - etWbUjDhq len=0 
' 0018     24 LABEL : Cell Value, String Constant - HdaxEObHA len=0 
' 0018     23 LABEL : Cell Value, String Constant - hLUInCnF len=0 
' 0018     22 LABEL : Cell Value, String Constant - iKnIUKq len=0 
' 0018     21 LABEL : Cell Value, String Constant - jgZWVW len=0 
' 0018     23 LABEL : Cell Value, String Constant - jyLZsQae len=0 
' 0018     20 LABEL : Cell Value, String Constant - KQsKv len=0 
' 0018     23 LABEL : Cell Value, String Constant - mBPgLWNB len=0 
' 0018     22 LABEL : Cell Value, String Constant - ovZonkA len=0 
' 0018     22 LABEL : Cell Value, String Constant - pYbxsRL len=0 
' 0018     23 LABEL : Cell Value, String Constant - qbSGmAYi len=0 
' 0018     23 LABEL : Cell Value, String Constant - qhHXWcin len=0 
' 0018     23 LABEL : Cell Value, String Constant - RFZeiqiz len=0 
' 0018     25 LABEL : Cell Value, String Constant - SSKkjYgeCW len=0 
' 0018     21 LABEL : Cell Value, String Constant - tCidDl len=0 
' 0018     20 LABEL : Cell Value, String Constant - wONgb len=0 
' 0018     21 LABEL : Cell Value, String Constant - YNNHkg 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 : Ce
... (truncated)

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