Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 786e9502e9b874a9…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:38:43 Authoring application: Microsoft Excel First seen: 2021-07-13
MD5: b7a0ecc400901249557dbbef0e45e935 SHA-1: d84f93355992a939ff40643e68f7068f87f448a8 SHA-256: 786e9502e9b874a905a5bb8b9314f2887aa36c6da7811c9cb5470b8ef579eb3c
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, which is a common technique for executing malicious code upon opening the document. The macro sheet contains a defined name for Auto_Open and uses dangerous formula APIs, suggesting it's designed to run commands. The specific commands or payload are not directly visible in the provided excerpts, but the intent is to execute arbitrary code.

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) 6691 bytes
SHA-256: 329f9ccd1db1937a7bf31b18860044067b21aa6aa9e02634c89948ca18f6727a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  WEZEqo
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I154 
' 0018     23 LABEL : Cell Value, String Constant - dFhaVtnI len=0 
' 0018     22 LABEL : Cell Value, String Constant - dkgvLZh len=0 
' 0018     24 LABEL : Cell Value, String Constant - elUJqPRDF len=0 
' 0018     21 LABEL : Cell Value, String Constant - GDtDxb len=0 
' 0018     27 LABEL : Cell Value, String Constant - GFnhIdQOIsIy len=0 
' 0018     27 LABEL : Cell Value, String Constant - GXRqtvThhJQD len=0 
' 0018     24 LABEL : Cell Value, String Constant - ILyhCUQZm len=0 
' 0018     23 LABEL : Cell Value, String Constant - iQyOBJeF len=0 
' 0018     22 LABEL : Cell Value, String Constant - KDdGQOi len=0 
' 0018     26 LABEL : Cell Value, String Constant - LhVkErGOkjB len=0 
' 0018     21 LABEL : Cell Value, String Constant - LPYGnr len=0 
' 0018     26 LABEL : Cell Value, String Constant - MSkQHrSQZSN len=0 
' 0018     27 LABEL : Cell Value, String Constant - nDRAlyyjZuct len=0 
' 0018     22 LABEL : Cell Value, String Constant - nYrytnd len=0 
' 0018     22 LABEL : Cell Value, String Constant - QHMPPao len=0 
' 0018     25 LABEL : Cell Value, String Constant - qxmRfIYNEi len=0 
' 0018     25 LABEL : Cell Value, String Constant - sIaHdghNne len=0 
' 0018     24 LABEL : Cell Value, String Constant - SjPbzTORJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZNwhDrrAOtM len=0 
' 0018     21 LABEL : Cell Value, String Constant - zrQizI 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
' 
... (truncated)

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