Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 208ea9ca5061cb45…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:38:20 Authoring application: Microsoft Excel First seen: 2021-10-16
MD5: d3c1b1bcce6df44bd65ca0b03ce37c76 SHA-1: b930fe1cadc6bfcb865242940de584ce323ae546 SHA-256: 208ea9ca5061cb4555b7d3773bcc441d547156df2eb0c7c2c2d5f258a113bfbf
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook. Heuristics indicate the presence of an Auto_Open function, which is a common technique for executing malicious code upon opening the document. The `RUN` formula API was also detected, suggesting the macro attempts to execute a command or payload.

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) 6568 bytes
SHA-256: 38d51091ee7bd4f4ac21d9f357e38a3cc66822478eadc3850bc6fecd37cbe4f4
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  KKJ
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B151 
' 0018     27 LABEL : Cell Value, String Constant - bzgWtYfSfips len=0 
' 0018     20 LABEL : Cell Value, String Constant - CizDy len=0 
' 0018     26 LABEL : Cell Value, String Constant - CSeixPRSXgl len=0 
' 0018     25 LABEL : Cell Value, String Constant - ECNDpffKEk len=0 
' 0018     20 LABEL : Cell Value, String Constant - ffYpr len=0 
' 0018     23 LABEL : Cell Value, String Constant - gVqmzXlH len=0 
' 0018     24 LABEL : Cell Value, String Constant - hkpEEdEln len=0 
' 0018     21 LABEL : Cell Value, String Constant - HNpbql len=0 
' 0018     21 LABEL : Cell Value, String Constant - hxTWsb len=0 
' 0018     20 LABEL : Cell Value, String Constant - iBNRc len=0 
' 0018     25 LABEL : Cell Value, String Constant - IkGVJOxqTP len=0 
' 0018     27 LABEL : Cell Value, String Constant - JNxeMHjNsGDG len=0 
' 0018     22 LABEL : Cell Value, String Constant - jpkqJyX len=0 
' 0018     20 LABEL : Cell Value, String Constant - JqmMR len=0 
' 0018     25 LABEL : Cell Value, String Constant - MUabLAPcrB len=0 
' 0018     22 LABEL : Cell Value, String Constant - NmTYytc len=0 
' 0018     24 LABEL : Cell Value, String Constant - OmFJIQguO len=0 
' 0018     22 LABEL : Cell Value, String Constant - rfGWIni len=0 
' 0018     21 LABEL : Cell Value, String Constant - xEZuvW len=0 
' 0018     20 LABEL : Cell Value, String Constant - YzgoT 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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