Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 113f8bb5914d425b…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:37 Authoring application: Microsoft Excel First seen: 2021-09-22
MD5: ef3dcddf2c5750f79c5b1029ebec8b51 SHA-1: c45b51e30b6a414c80eaf97807929e063d3b85a1 SHA-256: 113f8bb5914d425b0d8802b20b8fe87d5b129c4075fb49173a20a894f9f7b637
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 malicious execution. The presence of dangerous formula APIs like RUN further increases the risk. While the exact payload is not discernible from the provided evidence, the Auto_Open macro is designed to execute code upon opening the workbook.

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) 6644 bytes
SHA-256: d9201ad498df136963fb74a63a671245894f03bf8dcaf2d548275e4d9194ff3f
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  XYSXsdCFIO
' 0018     20 LABEL : Cell Value, String Constant - ABOZQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - arspSUCmUv len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E169 
' 0018     23 LABEL : Cell Value, String Constant - CPgMErjA len=0 
' 0018     25 LABEL : Cell Value, String Constant - cpGnpUWoKz len=0 
' 0018     23 LABEL : Cell Value, String Constant - eXnntvlt len=0 
' 0018     25 LABEL : Cell Value, String Constant - hkLqLXxLrk len=0 
' 0018     22 LABEL : Cell Value, String Constant - IUvHTQZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - mApmFx len=0 
' 0018     27 LABEL : Cell Value, String Constant - mdBLZtwDUUme len=0 
' 0018     26 LABEL : Cell Value, String Constant - NUVlrhTRxQB len=0 
' 0018     22 LABEL : Cell Value, String Constant - PaXReIp len=0 
' 0018     26 LABEL : Cell Value, String Constant - qYWPPjZfMJw len=0 
' 0018     20 LABEL : Cell Value, String Constant - scjrX len=0 
' 0018     20 LABEL : Cell Value, String Constant - thHnU len=0 
' 0018     25 LABEL : Cell Value, String Constant - uaJPDbwQQa len=0 
' 0018     25 LABEL : Cell Value, String Constant - wRcOKCyidY len=0 
' 0018     24 LABEL : Cell Value, String Constant - xacqGJUIC len=0 
' 0018     22 LABEL : Cell Value, String Constant - yFsQAgx len=0 
' 0018     21 LABEL : Cell Value, String Constant - yOJEzL len=0 
' 0018     20 LABEL : Cell Value, String Constant - ytolR 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 
... (truncated)

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