Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 06a8a26c4dd1c1c4…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:46:27 Authoring application: Microsoft Excel First seen: 2021-06-17
MD5: fc4139136b35ff68b93d6e8968a6dc9c SHA-1: f4f612cd4c0712b09024d586e8166e7020cfddb2 SHA-256: 06a8a26c4dd1c1c494a5389a2e88247cca87851633498de1d5b2243c4227e561
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 common technique for executing malicious code upon opening the workbook. The macro sheet contains a reference to 'Auto_Open', suggesting it's designed to run automatically. This functionality is likely used to download and execute a secondary payload, although no specific URLs or commands were extracted.

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) 6569 bytes
SHA-256: cc1c8ff422d069a784a1ead4951168bc87a072b3618d031a4f127db352774607
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 -  RwX
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F159 
' 0018     26 LABEL : Cell Value, String Constant - bUIinsHRCnY len=0 
' 0018     21 LABEL : Cell Value, String Constant - CZcJej len=0 
' 0018     26 LABEL : Cell Value, String Constant - eDcCOQZWIEM len=0 
' 0018     23 LABEL : Cell Value, String Constant - FDnOdalE len=0 
' 0018     22 LABEL : Cell Value, String Constant - GdAUslG len=0 
' 0018     21 LABEL : Cell Value, String Constant - grhQvB len=0 
' 0018     26 LABEL : Cell Value, String Constant - IgHVkedAuMx len=0 
' 0018     26 LABEL : Cell Value, String Constant - ILTTtFbqlPL len=0 
' 0018     26 LABEL : Cell Value, String Constant - MSXKkyyDpId len=0 
' 0018     22 LABEL : Cell Value, String Constant - OxVkimN len=0 
' 0018     25 LABEL : Cell Value, String Constant - pNCEdKsqbc len=0 
' 0018     21 LABEL : Cell Value, String Constant - POApvS len=0 
' 0018     22 LABEL : Cell Value, String Constant - PTwSSwu len=0 
' 0018     25 LABEL : Cell Value, String Constant - UlLbaSHcoB len=0 
' 0018     26 LABEL : Cell Value, String Constant - VMFyujovKlE len=0 
' 0018     27 LABEL : Cell Value, String Constant - wQxmlgsZugrS len=0 
' 0018     22 LABEL : Cell Value, String Constant - wXNMaEB len=0 
' 0018     26 LABEL : Cell Value, String Constant - XMAVgDAldLy len=0 
' 0018     23 LABEL : Cell Value, String Constant - xzilEjmF len=0 
' 0018     23 LABEL : Cell Value, String Constant - zncAPnwR 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
' 00
... (truncated)

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