Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7be4f9e5e36adebc…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:37:45 Authoring application: Microsoft Excel First seen: 2021-10-05
MD5: fdfd67c1ae72f0822d746039a7157604 SHA-1: b80aa634a6441c563f0b7d7e6d204628a1c185ba SHA-256: 7be4f9e5e36adebce5ce97311efe422a65af9e501de522fa63fb9deb2a261007
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 downloading and running a second-stage 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) 6730 bytes
SHA-256: 765e156de01a1a800709a2bd60448514484d61d9296be142b0e1e005b701f672
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  JzmLix
' 0018     27 LABEL : Cell Value, String Constant - AMNRgPrNIvSV len=0 
' 0018     27 LABEL : Cell Value, String Constant - APQOoNaNaGEL len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G172 
' 0018     23 LABEL : Cell Value, String Constant - bxkLPFKV len=0 
' 0018     27 LABEL : Cell Value, String Constant - CejtwImYKYEj len=0 
' 0018     27 LABEL : Cell Value, String Constant - CvkBpeEjdRzx len=0 
' 0018     26 LABEL : Cell Value, String Constant - gOtYacidHdZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - iAjzCndGwira len=0 
' 0018     25 LABEL : Cell Value, String Constant - JOmmlOfiRk len=0 
' 0018     22 LABEL : Cell Value, String Constant - kxXqaZg len=0 
' 0018     21 LABEL : Cell Value, String Constant - nJsxcW len=0 
' 0018     23 LABEL : Cell Value, String Constant - oPFazwbg len=0 
' 0018     21 LABEL : Cell Value, String Constant - pSGVet len=0 
' 0018     27 LABEL : Cell Value, String Constant - SENmfuQRaBwf len=0 
' 0018     22 LABEL : Cell Value, String Constant - SkaGIFZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - SvBJYycJuDTW len=0 
' 0018     26 LABEL : Cell Value, String Constant - vzWoJOFqPKP len=0 
' 0018     21 LABEL : Cell Value, String Constant - wGQlFr len=0 
' 0018     21 LABEL : Cell Value, String Constant - XIZCrg len=0 
' 0018     21 LABEL : Cell Value, String Constant - XXImTJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - ygdeGFhr 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/ 
... (truncated)

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