Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 cb28132bc16de751…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:37:02 Authoring application: Microsoft Excel First seen: 2021-10-12
MD5: 91852b0654ed4033c2df6024f11a6c84 SHA-1: 9798aa009de795fb5fd5408ec8a95cec2a287c47 SHA-256: cb28132bc16de751ca70935c4e14937ff573efca70847c8f3b6305ab58d8350d
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 commands. While the exact payload is not discernible from the provided evidence, the mechanism points to a downloader or initial execution stage.

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) 6438 bytes
SHA-256: 69c6eb4cc90ff4d5886bf25e43f6226f9a196b3d6e9e48570debc055fdc3fd46
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  aWafU
' 0018     24 LABEL : Cell Value, String Constant - AufsHIfnl len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G137 
' 0018     27 LABEL : Cell Value, String Constant - axiNkSAobjvn len=0 
' 0018     23 LABEL : Cell Value, String Constant - BIPQcAfe len=0 
' 0018     27 LABEL : Cell Value, String Constant - CzOACALotDbc len=0 
' 0018     23 LABEL : Cell Value, String Constant - ECLdBJJN len=0 
' 0018     20 LABEL : Cell Value, String Constant - EmaqV len=0 
' 0018     22 LABEL : Cell Value, String Constant - FQybnlP len=0 
' 0018     26 LABEL : Cell Value, String Constant - GwquiCfeQqH len=0 
' 0018     26 LABEL : Cell Value, String Constant - HLnPnzrbywp len=0 
' 0018     21 LABEL : Cell Value, String Constant - iMjBHR len=0 
' 0018     24 LABEL : Cell Value, String Constant - IQfQKdZeV len=0 
' 0018     22 LABEL : Cell Value, String Constant - JdQkBag len=0 
' 0018     22 LABEL : Cell Value, String Constant - MrZIWgj len=0 
' 0018     20 LABEL : Cell Value, String Constant - nXloG len=0 
' 0018     25 LABEL : Cell Value, String Constant - PaCDUcJVBq len=0 
' 0018     24 LABEL : Cell Value, String Constant - PXiXBTMVm len=0 
' 0018     22 LABEL : Cell Value, String Constant - QErePOA len=0 
' 0018     21 LABEL : Cell Value, String Constant - sVyyvw len=0 
' 0018     24 LABEL : Cell Value, String Constant - XYdVNeGHD len=0 
' 0018     27 LABEL : Cell Value, String Constant - zuBGFltYjcFM 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     
... (truncated)

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