Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 15055b29c3ae5957…

MALICIOUS

Office (OLE)

192.0 KB Created: 2020-07-16 03:34:56 Authoring application: Microsoft Excel First seen: 2020-09-07
MD5: 1f26f869490af8110c0fc6d7b0f3408d SHA-1: e156df4ed37eeafa2ffb43d4d7725b0d43c0bee1 SHA-256: 15055b29c3ae5957a61f54b3d24555d4508812ccc5dc1d4ab0a6b1b0a2708505
220 Risk Score

Heuristics 5

  • ClamAV: Xls.Dropper.Agent-8901712-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8901712-0
  • 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.
  • 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) 75851 bytes
SHA-256: 64e7e9f607c9bfd4fdd7be67499b37fb59c65084422f89f81ae900b69440e444
Preview script
First 1,000 lines of the extracted script
' 0085     11 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  vr
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  qPHEPgu
' 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     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet3
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet3
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet3
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0018     23 LABEL : Cell Value, String Constant - acJdiqgM len=0 
' 0018     18 LABEL : Cell Value, String Constant - aEG len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  vr!R44822 
' 0018     16 LABEL : Cell Value, String Constant - b len=0 
' 0018     23 LABEL : Cell Value, String Constant - bCLXzTyW len=0 
' 0018     34 LABEL : Cell Value, String Constant - bpxyIgbEGmsMUKpkljo len=0 
' 0018     25 LABEL : Cell Value, String Constant - bpzUhVIiFE len=0 
' 0018     29 LABEL : Cell Value, String Constant - BqhvGoobOpLYmU len=0 
' 0018     52 LABEL : Cell Value, String Constant - BwIMavxHRLoFXrLFuajjimYRYDPPeildCRKtb len=0 
' 0018     47 LABEL : Cell Value, String Constant - bzSrSdXpYvfpvrEUjqsCZUxzgmGODiee len=0 
' 0018     56 LABEL : Cell Value, String Constant - cjOoaptwoNqVFBpKzqFPxxkXyUhvdugkKyvpIFcxW len=0 
' 0018     45 LABEL : Cell Value, String Constant - ckxZtYwOaPMGYVscmsozRSnpyWDgwd len=0 
' 0018     48 LABEL : Cell Value, String Constant - CPZuIvhJfdGnFquVuGzSPmIgZVgxMhVfD len=0 
' 0018     22 LABEL : Cell Value, String Cons
... (truncated)