Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 394e3f7a291d59db…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:42:15 Authoring application: Microsoft Excel First seen: 2021-10-04
MD5: b42baf7a86ac5bf08f5e37a6eb64bb56 SHA-1: c0c6812cb6c03acf1b936adacf7b39b90900dead SHA-256: 394e3f7a291d59dbe975e8e5c3d1bfd8da3337901411213e3da0bbf3d8790810
140 Risk Score

Malware Insights

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

The critical heuristics OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN indicate the presence of an Excel 4.0 macro sheet with an Auto_Open entry, which is designed to execute automatically upon opening the workbook. This functionality is commonly abused to download and execute malicious payloads. No specific family could be identified from the available evidence.

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) 6863 bytes
SHA-256: ad32d12b1fd76b784cdb8a7682b92ee95200e05957bf63c797e272aefdd3ca4b
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  zGqpGzudl
' 0018     26 LABEL : Cell Value, String Constant - aQprnqrYbgp len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H142 
' 0018     20 LABEL : Cell Value, String Constant - BjBky len=0 
' 0018     21 LABEL : Cell Value, String Constant - bKrkNO len=0 
' 0018     24 LABEL : Cell Value, String Constant - BVVWGfgZS len=0 
' 0018     24 LABEL : Cell Value, String Constant - CwOdeyTWy len=0 
' 0018     27 LABEL : Cell Value, String Constant - dOwzGwOKgXNj len=0 
' 0018     22 LABEL : Cell Value, String Constant - drmItGJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - HcIqQaby len=0 
' 0018     26 LABEL : Cell Value, String Constant - hWLNfMRGFAx len=0 
' 0018     23 LABEL : Cell Value, String Constant - ibJmejcD len=0 
' 0018     24 LABEL : Cell Value, String Constant - LUxWMFjaO len=0 
' 0018     26 LABEL : Cell Value, String Constant - MBlkxnGxIsa len=0 
' 0018     25 LABEL : Cell Value, String Constant - mrRUrCKZlg len=0 
' 0018     27 LABEL : Cell Value, String Constant - OenGzokeUcts len=0 
' 0018     20 LABEL : Cell Value, String Constant - PmZjs len=0 
' 0018     24 LABEL : Cell Value, String Constant - SdNmTsUkt len=0 
' 0018     22 LABEL : Cell Value, String Constant - SgfVhxu len=0 
' 0018     27 LABEL : Cell Value, String Constant - UesicAfgIiiK len=0 
' 0018     24 LABEL : Cell Value, String Constant - wTmUWhZar len=0 
' 0018     21 LABEL : Cell Value, String Constant - ybMOsx 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
'
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.