Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b4ce4cca04f38f31…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:11 Authoring application: Microsoft Excel First seen: 2021-09-27
MD5: d00dd21891b1b44333c37c3e9cb68ef7 SHA-1: a712b63ced21a201cd6e0504dabe6394e38c9b09 SHA-256: b4ce4cca04f38f31086711098f0941ec932b5df507352d3640c2937d90e95d5a
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 function, which is a known technique for executing malicious code upon opening the workbook. The critical heuristic firings indicate the presence of dangerous formula APIs within the XLM macro, suggesting an attempt to exploit the application or download a secondary payload. No specific family could be identified.

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) 6752 bytes
SHA-256: c63134e1b6acd16fe7d3ce180244b087333b7c4d260f30d4f9bc934421360db7
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  GSSiNCt
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C154 
' 0018     22 LABEL : Cell Value, String Constant - blwkCSj len=0 
' 0018     26 LABEL : Cell Value, String Constant - dXGZGqbtjov len=0 
' 0018     23 LABEL : Cell Value, String Constant - dZccvMmn len=0 
' 0018     20 LABEL : Cell Value, String Constant - EVoxW len=0 
' 0018     24 LABEL : Cell Value, String Constant - hbEvekEUV len=0 
' 0018     26 LABEL : Cell Value, String Constant - HNXDnsWdHfc len=0 
' 0018     27 LABEL : Cell Value, String Constant - HRVrMZcBWWdX len=0 
' 0018     27 LABEL : Cell Value, String Constant - hxqalpustrZP len=0 
' 0018     26 LABEL : Cell Value, String Constant - kNMeVNBlaBl len=0 
' 0018     24 LABEL : Cell Value, String Constant - kZVasjLUY len=0 
' 0018     23 LABEL : Cell Value, String Constant - loupgUZg len=0 
' 0018     20 LABEL : Cell Value, String Constant - lpmiL len=0 
' 0018     27 LABEL : Cell Value, String Constant - MxtMAlSBqMbu len=0 
' 0018     27 LABEL : Cell Value, String Constant - RUVIPhqOrRkT len=0 
' 0018     25 LABEL : Cell Value, String Constant - sQZlKnffzp len=0 
' 0018     21 LABEL : Cell Value, String Constant - ToGyJV len=0 
' 0018     27 LABEL : Cell Value, String Constant - UHwkdwQcsGTq len=0 
' 0018     23 LABEL : Cell Value, String Constant - uJAEmEjn len=0 
' 0018     22 LABEL : Cell Value, String Constant - XzsAPYP len=0 
' 0018     27 LABEL : Cell Value, String Constant - zguRuQytyOxz 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 Consta
... (truncated)

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