Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c62b7b5ba2375565…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:46:00 Authoring application: Microsoft Excel First seen: 2021-09-24
MD5: 904aad734a13958833839980e3b55b00 SHA-1: 245f55e6c8964f0a28c9060871cd60ab35ecc6b6 SHA-256: c62b7b5ba23755656608776301453d3f2bedab518e8b36617c7cc8abbb297462
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is an Excel 4.0 macro-enabled workbook containing an Auto_Open defined name, which is a critical indicator of malicious intent. This technique allows for the automatic execution of code upon opening the document, bypassing standard macro security warnings. The presence of dangerous formula APIs further supports the malicious nature of the macro.

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) 6433 bytes
SHA-256: 1c8103bfe9e8dbf604d42a6be4e69dfd8ea2e2d9335f1a54be656fef78ef2ebf
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 -  iqFwfu
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F165 
' 0018     27 LABEL : Cell Value, String Constant - avGSaqCXPENY len=0 
' 0018     26 LABEL : Cell Value, String Constant - DseccrzOxvN len=0 
' 0018     20 LABEL : Cell Value, String Constant - eTLWU len=0 
' 0018     20 LABEL : Cell Value, String Constant - GfWcr len=0 
' 0018     26 LABEL : Cell Value, String Constant - jNXPtvBshEY len=0 
' 0018     22 LABEL : Cell Value, String Constant - OiRdQLp len=0 
' 0018     27 LABEL : Cell Value, String Constant - PDooaRmxDxdT len=0 
' 0018     23 LABEL : Cell Value, String Constant - qvLQZvDF len=0 
' 0018     27 LABEL : Cell Value, String Constant - RinivpIohbIq len=0 
' 0018     22 LABEL : Cell Value, String Constant - SaCAFUR len=0 
' 0018     20 LABEL : Cell Value, String Constant - sQtBC len=0 
' 0018     22 LABEL : Cell Value, String Constant - tdtkmwO len=0 
' 0018     22 LABEL : Cell Value, String Constant - TOockYb len=0 
' 0018     25 LABEL : Cell Value, String Constant - unhqqvSoHF len=0 
' 0018     20 LABEL : Cell Value, String Constant - vCJah len=0 
' 0018     20 LABEL : Cell Value, String Constant - WTbQL len=0 
' 0018     25 LABEL : Cell Value, String Constant - XWlSccXWiI len=0 
' 0018     24 LABEL : Cell Value, String Constant - yKLIxHYEg len=0 
' 0018     23 LABEL : Cell Value, String Constant - YzjQSPSr len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZAlAPe 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 LABE
... (truncated)

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