Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6eddb8524be0e7bc…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:44:09 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 6395e3ab6e005ffd5091774331ab0a85 SHA-1: 6b0989479c4a07723afb6da5799c03217e455d70 SHA-256: 6eddb8524be0e7bcafc2b451ca96cdd816a68f00fadc7c460cb33e52f7a22cc0
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 macros with an Auto_Open entry, a common technique for executing malicious code upon file opening. The presence of 'risky-formula=2; RUN=0' suggests the macro attempts to run external commands or download payloads. No specific family could be identified, but the technique strongly points to a downloader or initial execution stage.

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) 6711 bytes
SHA-256: 4a9b43d7c50acaa6c883ece7323358f94c0b7d55dcee9e0b90f699d914e5cec5
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 -  JWGEjZf
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H148 
' 0018     23 LABEL : Cell Value, String Constant - avUKWyVC len=0 
' 0018     27 LABEL : Cell Value, String Constant - dCavCgjlQVSN len=0 
' 0018     25 LABEL : Cell Value, String Constant - DtcTfoJgRn len=0 
' 0018     27 LABEL : Cell Value, String Constant - eaaTXcjzyIoZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - fdowysPwsOGa len=0 
' 0018     23 LABEL : Cell Value, String Constant - FFfYVsex len=0 
' 0018     23 LABEL : Cell Value, String Constant - FjLlfLuW len=0 
' 0018     25 LABEL : Cell Value, String Constant - FpPOjOCoEb len=0 
' 0018     23 LABEL : Cell Value, String Constant - ggKJXWZB len=0 
' 0018     26 LABEL : Cell Value, String Constant - HSKiShzUSLK len=0 
' 0018     22 LABEL : Cell Value, String Constant - IWjRoVU len=0 
' 0018     21 LABEL : Cell Value, String Constant - jiazaf len=0 
' 0018     23 LABEL : Cell Value, String Constant - jRQSLPRL len=0 
' 0018     24 LABEL : Cell Value, String Constant - mAQmeFFGp len=0 
' 0018     20 LABEL : Cell Value, String Constant - Mbzdd len=0 
' 0018     21 LABEL : Cell Value, String Constant - pvTuYE len=0 
' 0018     27 LABEL : Cell Value, String Constant - RwggSOXXEOsI len=0 
' 0018     20 LABEL : Cell Value, String Constant - rXDPo len=0 
' 0018     21 LABEL : Cell Value, String Constant - VHuXzu len=0 
' 0018     23 LABEL : Cell Value, String Constant - vRwIkfKD 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  
... (truncated)

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