Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 cd3d08f54d551326…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:28:22 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: 9df9380b1d9df355d5caffadd8a2603d SHA-1: ee5e86de33b0d2b20e5fb7243157d138ab0c6efc SHA-256: cd3d08f54d5513262aff5144ed56eab49334a965d16d983244b9f1fdf0d0e362
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 (XLM) macros with an Auto_Open entry, which is a common technique for executing malicious code upon opening the document. The macro sheet contains formulas that call dangerous functions, including RUN, suggesting it is designed to execute arbitrary commands. This points to a macro-based downloader or dropper.

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) 6453 bytes
SHA-256: a79ec046f3498c3eb714988b228eb3e9a58e376a9687326c42895d9cff2eaf51
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 -  QchwdQE
' 0018     21 LABEL : Cell Value, String Constant - amDfZl len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F191 
' 0018     24 LABEL : Cell Value, String Constant - BXLwYqdbB len=0 
' 0018     25 LABEL : Cell Value, String Constant - CLqjOIpXeK len=0 
' 0018     22 LABEL : Cell Value, String Constant - DtldLfx len=0 
' 0018     21 LABEL : Cell Value, String Constant - DWIMuz len=0 
' 0018     25 LABEL : Cell Value, String Constant - gRFwpAgeZZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - HBEHzWO len=0 
' 0018     20 LABEL : Cell Value, String Constant - JbFlN len=0 
' 0018     20 LABEL : Cell Value, String Constant - jClNr len=0 
' 0018     23 LABEL : Cell Value, String Constant - JvvsMnpC len=0 
' 0018     26 LABEL : Cell Value, String Constant - KhXqaURSaoI len=0 
' 0018     27 LABEL : Cell Value, String Constant - nFVicHVxxwwc len=0 
' 0018     24 LABEL : Cell Value, String Constant - NMVbKYSju len=0 
' 0018     20 LABEL : Cell Value, String Constant - nzFnG len=0 
' 0018     22 LABEL : Cell Value, String Constant - QdPXiQU len=0 
' 0018     21 LABEL : Cell Value, String Constant - rkpIkX len=0 
' 0018     20 LABEL : Cell Value, String Constant - TABGS len=0 
' 0018     25 LABEL : Cell Value, String Constant - THBVmSjCBn len=0 
' 0018     23 LABEL : Cell Value, String Constant - unNlqTDX len=0 
' 0018     20 LABEL : Cell Value, String Constant - VlerR 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 LABELSST : Cel
... (truncated)

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