Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2bdb066fafec3403…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:38:46 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: f088e5cee162e5c5cbd5de73a1564a7b SHA-1: fe387c2763e1d0d894990e9eb011459eb3531003 SHA-256: 2bdb066fafec3403c102a4338ab6c7536c8fbb13e7055651cb8ef67716e0c5cd
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open defined name, which is a known method for executing arbitrary commands upon opening the workbook. The `RUN` function API was identified, suggesting the macro is designed to execute a 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) 6660 bytes
SHA-256: a8d9c773386b93371dcdb0e9de728d994abec25a977cd904581fca4e7eceda0d
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 -  zJz
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F160 
' 0018     24 LABEL : Cell Value, String Constant - bogPbIjiy len=0 
' 0018     26 LABEL : Cell Value, String Constant - chJXyxhlHaJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - coCeLsIiZnTw len=0 
' 0018     22 LABEL : Cell Value, String Constant - HiEKSEZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - HkQKAi len=0 
' 0018     21 LABEL : Cell Value, String Constant - JNjVOr len=0 
' 0018     27 LABEL : Cell Value, String Constant - LVddItVoWkxc len=0 
' 0018     23 LABEL : Cell Value, String Constant - MlKXCVcT len=0 
' 0018     25 LABEL : Cell Value, String Constant - PBYDWKDgUP len=0 
' 0018     22 LABEL : Cell Value, String Constant - qPXsBtC len=0 
' 0018     27 LABEL : Cell Value, String Constant - QzLipjTKTkef len=0 
' 0018     27 LABEL : Cell Value, String Constant - TluvQeToLQnI len=0 
' 0018     22 LABEL : Cell Value, String Constant - vwzwXlb len=0 
' 0018     20 LABEL : Cell Value, String Constant - wWoSo len=0 
' 0018     22 LABEL : Cell Value, String Constant - xPOpwbY len=0 
' 0018     20 LABEL : Cell Value, String Constant - xQSYB len=0 
' 0018     24 LABEL : Cell Value, String Constant - XsvBAaQTn len=0 
' 0018     24 LABEL : Cell Value, String Constant - yLQqfJbih len=0 
' 0018     20 LABEL : Cell Value, String Constant - yntDC len=0 
' 0018     25 LABEL : Cell Value, String Constant - zntrshIAUj 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 
... (truncated)

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