Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 02c340f1ea39ca6e…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:47:20 Authoring application: Microsoft Excel First seen: 2021-09-18
MD5: 5531da851b84daf944488ca7fc923ec4 SHA-1: 41a49205736437f212eaed78fb8c22e3ed1d3230 SHA-256: 02c340f1ea39ca6e5f61daacded920f38a99b81ef5f5cf28ccf5868a889c6b62
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open defined name, which is a critical indicator of malicious intent. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code. This is a common technique for downloading and executing further malicious payloads.

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) 6650 bytes
SHA-256: 0b1df11785e0301f80dfa010da8bfd1e64cb70d6e421cbc21ee5ee839a156b01
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 -  KfROyHkzp
' 0018     23 LABEL : Cell Value, String Constant - AdaeKpbs len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E172 
' 0018     24 LABEL : Cell Value, String Constant - aZtTnaKHH len=0 
' 0018     27 LABEL : Cell Value, String Constant - bFWhpbDaGofh len=0 
' 0018     23 LABEL : Cell Value, String Constant - bROLYxIC len=0 
' 0018     26 LABEL : Cell Value, String Constant - DbzXgJPHLLo len=0 
' 0018     26 LABEL : Cell Value, String Constant - eZbBMTefQgZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - jvhEBYKEKt len=0 
' 0018     21 LABEL : Cell Value, String Constant - kAkPqs len=0 
' 0018     23 LABEL : Cell Value, String Constant - nVsMqTlS len=0 
' 0018     23 LABEL : Cell Value, String Constant - nwdAMUsH len=0 
' 0018     22 LABEL : Cell Value, String Constant - omLNJUA len=0 
' 0018     27 LABEL : Cell Value, String Constant - pFEsJKKoLgsT len=0 
' 0018     22 LABEL : Cell Value, String Constant - pSMtNTX len=0 
' 0018     25 LABEL : Cell Value, String Constant - qSrPoRtgvv len=0 
' 0018     22 LABEL : Cell Value, String Constant - rfLSSFB len=0 
' 0018     21 LABEL : Cell Value, String Constant - WXvGoa len=0 
' 0018     24 LABEL : Cell Value, String Constant - xHKbbpqFP len=0 
' 0018     25 LABEL : Cell Value, String Constant - XRKbZgHlit len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZDIWlkhUmY len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZnnWtim 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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