Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 be54ec6eae40d4c8…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:44 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: b93b5be411626ea0ab44d2ee5af01f96 SHA-1: 8bceb2a1fd72f8e411f0c8ba2f7502b58030f23f SHA-256: be54ec6eae40d4c8324d07d11ce34fa76387551c6b64125a77967678ee4eaba5
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 finding indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN further suggests malicious intent. While the exact payload is not discernible from the provided evidence, the mechanism points to an attempt to execute arbitrary code.

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) 6432 bytes
SHA-256: a91429bbc5625582c6adb9bd2fc97533f8dfe98cb191b1cbe921ac2f81b20841
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  ttPb
' 0018     22 LABEL : Cell Value, String Constant - aaobQhu len=0 
' 0018     24 LABEL : Cell Value, String Constant - arcisaFEt len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B157 
' 0018     22 LABEL : Cell Value, String Constant - hoNgTHl len=0 
' 0018     20 LABEL : Cell Value, String Constant - iiZtO len=0 
' 0018     21 LABEL : Cell Value, String Constant - JrdztI len=0 
' 0018     20 LABEL : Cell Value, String Constant - KOgcS len=0 
' 0018     22 LABEL : Cell Value, String Constant - NuiaXzW len=0 
' 0018     22 LABEL : Cell Value, String Constant - NUTpWPd len=0 
' 0018     20 LABEL : Cell Value, String Constant - OTNMa len=0 
' 0018     20 LABEL : Cell Value, String Constant - qsulc len=0 
' 0018     22 LABEL : Cell Value, String Constant - QvGIRWl len=0 
' 0018     27 LABEL : Cell Value, String Constant - RJBokaCiATLr len=0 
' 0018     26 LABEL : Cell Value, String Constant - rQWOsZZcOZB len=0 
' 0018     20 LABEL : Cell Value, String Constant - UclsR len=0 
' 0018     25 LABEL : Cell Value, String Constant - VcVpXEjGiM len=0 
' 0018     20 LABEL : Cell Value, String Constant - vRweJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - wZDXlOsDdkl len=0 
' 0018     26 LABEL : Cell Value, String Constant - yvhaoieSABm len=0 
' 0018     26 LABEL : Cell Value, String Constant - zOHECGMbAkG len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZsjiGMnuv 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 : Ce
... (truncated)

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