Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 bd757f4f69bec3b2…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:25:16 Authoring application: Microsoft Excel First seen: 2021-07-10
MD5: 33f20cdb07fde9a91505deee5028ba3c SHA-1: 9295d76c5adf69a3111ccfd139c630fe345a71f5 SHA-256: bd757f4f69bec3b25b6dc1a952705ffc9286d7378b4eaae997d890f29cea8a18
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code, likely a downloader for a secondary payload. 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) 6611 bytes
SHA-256: d2dca86ba295b765e2a49014bd6e5e65c0904a96e38116693e79daa8334a775c
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 -  MyqZfmOqP
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F163 
' 0018     24 LABEL : Cell Value, String Constant - aVWQYQvsd len=0 
' 0018     23 LABEL : Cell Value, String Constant - DsvOiHRw len=0 
' 0018     22 LABEL : Cell Value, String Constant - fdHbSoA len=0 
' 0018     24 LABEL : Cell Value, String Constant - FLZQAUZjP len=0 
' 0018     24 LABEL : Cell Value, String Constant - grgZgOFCY len=0 
' 0018     26 LABEL : Cell Value, String Constant - HmOoyRRBoZk len=0 
' 0018     24 LABEL : Cell Value, String Constant - JxqiAzSRg len=0 
' 0018     23 LABEL : Cell Value, String Constant - kMMXmpzf len=0 
' 0018     21 LABEL : Cell Value, String Constant - LeSseD len=0 
' 0018     21 LABEL : Cell Value, String Constant - LuQVBl len=0 
' 0018     26 LABEL : Cell Value, String Constant - MYlataJXwfm len=0 
' 0018     21 LABEL : Cell Value, String Constant - pRRyse len=0 
' 0018     26 LABEL : Cell Value, String Constant - pywIACorBBG len=0 
' 0018     23 LABEL : Cell Value, String Constant - RqOVaTrT len=0 
' 0018     24 LABEL : Cell Value, String Constant - RzBbSELeQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - uAUMsyDaJSC len=0 
' 0018     26 LABEL : Cell Value, String Constant - UavrfAKQMOa len=0 
' 0018     26 LABEL : Cell Value, String Constant - ucqPtyMqCEB len=0 
' 0018     23 LABEL : Cell Value, String Constant - uXoLSakc len=0 
' 0018     23 LABEL : Cell Value, String Constant - vFXedFKh 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)

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