Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 797ccd605f7d0248…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:14 Authoring application: Microsoft Excel First seen: 2021-07-02
MD5: a5a0efba661eed4a0320539d3f482636 SHA-1: ee5bc2b93da42c326513522a901dbd2331ffe8e3 SHA-256: 797ccd605f7d0248233f4e22df7ddcc84e302ecdee27b65c5ca63c5dffdf6c91
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. Static analysis detected an Auto_Open defined name, indicating that the macro sheet will execute automatically upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute a secondary payload. The document body contains heavily obfuscated and truncated text, making its specific lure unclear, but the macro execution is the primary threat.

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) 6681 bytes
SHA-256: e52c5cc189282839a78a8a3830e55cd312d9aea40d763d0841f3f5a8abf44a49
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 -  LUubp
' 0018     24 LABEL : Cell Value, String Constant - acnnKGKef len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G152 
' 0018     27 LABEL : Cell Value, String Constant - BBrGyRFUDOcj len=0 
' 0018     20 LABEL : Cell Value, String Constant - bvbAn len=0 
' 0018     26 LABEL : Cell Value, String Constant - CHVRebeGHQu len=0 
' 0018     20 LABEL : Cell Value, String Constant - EvcRP len=0 
' 0018     20 LABEL : Cell Value, String Constant - HByqE len=0 
' 0018     25 LABEL : Cell Value, String Constant - HegHSNTFwc len=0 
' 0018     27 LABEL : Cell Value, String Constant - HMABNGjCHOcp len=0 
' 0018     24 LABEL : Cell Value, String Constant - jyCsfuaon len=0 
' 0018     21 LABEL : Cell Value, String Constant - npqZCL len=0 
' 0018     23 LABEL : Cell Value, String Constant - pEZZOwtz len=0 
' 0018     22 LABEL : Cell Value, String Constant - rBYFOku len=0 
' 0018     20 LABEL : Cell Value, String Constant - RQmEy len=0 
' 0018     25 LABEL : Cell Value, String Constant - tCyHtYCizB len=0 
' 0018     20 LABEL : Cell Value, String Constant - TUHmR len=0 
' 0018     26 LABEL : Cell Value, String Constant - TwJkAExxxDc len=0 
' 0018     23 LABEL : Cell Value, String Constant - wULgpJbc len=0 
' 0018     20 LABEL : Cell Value, String Constant - XwswV len=0 
' 0018     20 LABEL : Cell Value, String Constant - yNrOb len=0 
' 0018     27 LABEL : Cell Value, String Constant - yqxqlVykcPev 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 LABELSS
... (truncated)

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