Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2a2cabf29d0c2216…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:41:31 Authoring application: Microsoft Excel First seen: 2021-10-23
MD5: 01e2c581d8ee8bdcdd5c8060d90a600f SHA-1: 325599aac0d95c161093879a4ec4b355ef7727e9 SHA-256: 2a2cabf29d0c22160689c150dce22813dbd3ca8f42bc5dde6f591d866fdfa329
140 Risk Score

Malware Insights

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

The file is an Excel document containing Excel 4.0 macros, specifically an Auto_Open defined name. This indicates an attempt to automatically execute malicious code upon opening the document. The presence of dangerous formula APIs like RUN further confirms the malicious intent.

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) 6763 bytes
SHA-256: f3909a7ba41c6e1c4cebdc4eca84e9b2545fc7cafc15a06af0e0ae58638de25a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  ITbeBLbakLZ
' 0018     22 LABEL : Cell Value, String Constant - AIxrRFG len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C158 
' 0018     21 LABEL : Cell Value, String Constant - Clhqez len=0 
' 0018     20 LABEL : Cell Value, String Constant - DwDpY len=0 
' 0018     26 LABEL : Cell Value, String Constant - evyGtOkjGwz len=0 
' 0018     21 LABEL : Cell Value, String Constant - HsjDph len=0 
' 0018     26 LABEL : Cell Value, String Constant - iBwuGkPcqOK len=0 
' 0018     22 LABEL : Cell Value, String Constant - lJhMdCa len=0 
' 0018     25 LABEL : Cell Value, String Constant - MhhHxvgeFk len=0 
' 0018     23 LABEL : Cell Value, String Constant - MWCelRmX len=0 
' 0018     24 LABEL : Cell Value, String Constant - onsyPxfpj len=0 
' 0018     23 LABEL : Cell Value, String Constant - OohpAUqe len=0 
' 0018     22 LABEL : Cell Value, String Constant - OZoJHJe len=0 
' 0018     26 LABEL : Cell Value, String Constant - PpejTmyjymW len=0 
' 0018     25 LABEL : Cell Value, String Constant - qFhvzbPdtp len=0 
' 0018     27 LABEL : Cell Value, String Constant - qOUaxGuYqpiz len=0 
' 0018     22 LABEL : Cell Value, String Constant - TGUKBzE len=0 
' 0018     22 LABEL : Cell Value, String Constant - vyKyOqg len=0 
' 0018     24 LABEL : Cell Value, String Constant - yEKgPffCx len=0 
' 0018     26 LABEL : Cell Value, String Constant - YglhIpdtUYz len=0 
' 0018     23 LABEL : Cell Value, String Constant - YxMyuSAz 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
' 00f
... (truncated)

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