Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1b426804ed4309fe…

MALICIOUS

Office (OLE)

113.5 KB Created: 2020-06-22 16:20:38 Authoring application: Microsoft Excel First seen: 2020-08-25
MD5: 1cf747f737d4e5771dd8e5e3f3758dd0 SHA-1: 4c03ed04d13179c8461ed5779195369814f1efd7 SHA-256: 1b426804ed4309fe0470cbf383653eeb458430674fd5909f16104197b63591f1
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The file is an Excel document containing Excel 4.0 (XLM) macros, indicated by the OLE_XLM_AUTOOPEN heuristic. The document body contains a lure instructing the user to 'Enable Editing to continue', which is a common technique to bypass macro security. The presence of an Auto_Open defined name suggests that the macro will execute automatically upon opening the workbook.

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.
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

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) 57145 bytes
SHA-256: d6274c9079467aa273e92712a47750f5fec5d7d8d5b3830253ef17a27395cd8c
Preview script
First 1,000 lines of the extracted script
' 0085     10 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  P
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet
' 0085     22 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  ewRkeUzJKINxq
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet1
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet1
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet1
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet1
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet1
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet1
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet1
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet1
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet1
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet1
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet2
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet2
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet2
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet2
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet2
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet2
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet2
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet2
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet2
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet2
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  P!GL36926 
' 0018     21 LABEL : Cell Value, String Constant - bHCCBG len=0 
' 0018     23 LABEL : Cell Value, String Constant - bpOPpyLn len=0 
' 0018     23 LABEL : Cell Value, String Constant - ChGXjXVP len=0 
' 0018     20 LABEL : Cell Value, String Constant - Chqrp len=0 
' 0018     23 LABEL : Cell Value, String Constant - CHryGWxw len=0 
' 0018     22 LABEL : Cell Value, String Constant - cMXcZkC len=0 
' 0018     23 LABEL : Cell Value, String Constant - cNuwRtyN len=0 
' 0018     20 LABEL : Cell Value, String Constant - dezCL len=0 
' 0018     20 LABEL : Cell Value, String Constant - DRyQD len=0 
' 0018     21 LABEL : Cell Value, String Constant - EDIfls len=0 
' 0018     22 LABEL : Cell Value, String Constant - EoipTgf len=0 
' 0018     21 LABEL : Cell Value, String Constant - ePIPtU len=0 
' 0018     22 LABEL : Cell Value, String Constant - FHyYBfQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - GBetNg len=0 
' 0018     21 LABEL : Cell Value, String Constant - gJNblG len=0 
' 0018     20 LABEL : Cell Value, String Constant - hJIYO len=0 
' 0018     22 LABEL : Cell Value, String Constant - hlnfFUM len=0 
' 0018     20 LABEL : Cell Value, String Constant - HNgod len=0 
' 0018     23 LABEL : Cell Value, String Constant - HtgIdcFm len=0 
' 0018
... (truncated)