Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 83aaf79ba8cb78ba…

MALICIOUS

Office (OLE)

166.0 KB Created: 2020-07-02 15:46:44 Authoring application: Microsoft Excel First seen: 2020-09-07
MD5: 122e863c8d959fdb586a6a4ca09e6cb1 SHA-1: ab5d42a9f39bfedf3e9f27972757dfe943b1893d SHA-256: 83aaf79ba8cb78ba77a7ad2b96e276e1d7bc731d734987c8acdfa6db40eea318
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding. The macros utilize dangerous formula APIs like RUN, indicating an attempt to execute code. The presence of a lure to enable macros further supports this, suggesting the document is designed to trick users into running a malicious payload. The reconstructed URL 'http://fjgdENrC\ROwKLTIcHoSzWy,DeisvUMnaFAJxuGBPbQm' is likely the initial stage of a download or command and control communication.

Heuristics 4

  • 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) 112529 bytes
SHA-256: c73f97288f7b941f0fda0a0341240bf5d27c533f05c5ccba1df150e774793b7c
Preview script
First 1,000 lines of the extracted script
' 0085     13 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, very hidden -  Erro
' 0085     11 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  Bw
' 0085     13 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Exce
' 0018     16 LABEL : Cell Value, String Constant - a len=0 
' 0018     64 LABEL : Cell Value, String Constant - aCLXyTxWoOoztMuSCMSOaqGNPYvqUWDJckZFBBzFpvEUutKzD len=0 
' 0018     35 LABEL : Cell Value, String Constant - adrNPYidGWoJcWMrBBzF len=0 
' 0018     26 LABEL : Cell Value, String Constant - afndJSSRVsz len=0 
' 0018     47 LABEL : Cell Value, String Constant - ahoTffuyCtShaKruPrvKHpDccEMYBUzX len=0 
' 0018     37 LABEL : Cell Value, String Constant - aJwRIyNXGFssUcoRkQoGSG len=0 
' 0018     33 LABEL : Cell Value, String Constant - aphSzCXzESOwLkkLUg len=0 
' 0018     58 LABEL : Cell Value, String Constant - apLyIfaEGmGMUJoxywCZfmRedtxzrRgYJqsNpuIFnBa len=0 
' 0018     44 LABEL : Cell Value, String Constant - aqrNPYvdHWDJckaGBBzFpipUugwzD len=0 
' 0018     58 LABEL : Cell Value, String Constant - aSrUywfToeVjtccPPqyMnHmLcocaUmjGpBHDOfgCDNk len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Erro!IW15396 
' 0018     63 LABEL : Cell Value, String Constant - axeIYFLembHDDCGrkrWwixCFwVydNJxSIyNXGGsfHdpElDos len=0 
' 0018     63 LABEL : Cell Value, String Constant - ayFBNQezCLVQtJbvPJyennmrcVcHUTjmphGVOxgiDfkxIdqe len=0 
' 0018     16 LABEL : Cell Value, String Constant - b len=0 
' 0018     27 LABEL : Cell Value, String Constant - baOzbxKYGXJp len=0 
' 0018     43 LABEL : Cell Value, String Constant - BaphSzCXyEScwLxkLhgJpHtxXxJD len=0 
' 0018     38 LABEL : Cell Value, String Constant - bBMGYIeOZfbmESablJEhiPW len=0 
' 0018     28 LABEL : Cell Value, String Constant - BbNdgjbzdIrnc len=0 
' 0018     34 LABEL : Cell Value, String Constant - bcafQXeuVVkbdVuXCzh len=0 
' 0018     21 LABEL : Cell Value, String Constant - BfsrIL len=0 
' 0018     40 LABEL : Cell Value, String Constant - BFTdyMylNjhKrJuyYyKEWTqMk len=0 
' 0018     52 LABEL : Cell Value, String Constant - BGdkrWiixCFwVkdNuxSuyNJsGffHPbEXDasSs len=0 
' 0018     49 LABEL : Cell Value, String Constant - bGevWwICUDZJUaWhyOVXgEyceLRkshNJJH len=0 
' 0018     19 LABEL : Cell Value, String Constant - bhoG len=0 
' 0018     25 LABEL : Cell Value, String Constant - biMZYosvmM len=0 
' 0018     20 LABEL : Cell Value, String Constant - blUUH len=0 
' 0018     52 LABEL : Cell Value, String Constant - BNCysLIeOZfbmEFablJpTjPWpxmSOOMRDvDhI len=0 
' 0018     42 LABEL : Cell Value, String Constant - bsFsqkDzWGRXTevwSTdBhLaHOgo len=0 
' 0018     63 LABEL : Cell Value, String Constant - bTsIzkSUoRWjuPcQCdzyaIZLQpQbVnkHdCtpCShDqzXSvxex len=0 
' 0018     38 LABEL : Cell Value, String Constant - bUEloJlpEziwWWwGSuOtRjJ len=0 
' 0018     42 LABEL : Cell Value, String Constant - BukQZZYcOHOsFFVYbTrHzjRUoRV len=0 
' 0018     36 LABEL : Cell Value, String Constant - bVnWscntpBShopzXSvxdk len=0 
' 0018     20 LABEL : Cell Value, String Constant - BVzYp len=0 
' 0018     61 LABEL : Cell Value, String Constant - bWzQiDWQGluusxjcjOaaptwoNcVFmpKmqFPkxkXyUTvdug len=0 
' 0018     58 LABEL : Cell Value, String Constant - BXkygxjnNCysLIeBZfbmqFaclupTjCWpjZFOONRDvDh len=0 
' 0018     49 LABEL : Cell Value, String Constant - BxVFPVRdtuQSbyfJZGMfncIEEDHslsXxjz len=0 
' 0018     23 LABEL : Cell Value, String Constant - bYvfpvrE len=0 
' 0018     45 LABEL : Cell Value, String Constant - bzRdSPJbYuepvrDUVqsCZGjzgmGODi len=0 
' 0018     31 LABEL : Cell Value, String Constant - CEYBGTdyMzlNjiKr len=0 
' 0018     35 LABEL : Cell Value, String Constant - cfXvLEnVYsVZnxTgTGhE len=0 
' 0018     46 LABEL : Cell Value, String Constant - CjlHjnCMguhUuRQsZrdhHhsmFCYuTLH len=0 
' 0018     17 LABEL : Cell Value, String Constant - CL len=0 
' 0018     17 LABEL : Cell Value, String Constant - cP len=0 
' 0018     51 LABEL : Cell Value, String Constant - CPqLpOfGgrlEmJsEKGRixFGQniMOuBUcRwss len=0 
' 0018     31 LABEL : Cell Value, String Constant - CqnhzwUDOUQbstPR len=0 
' 0018     23 LABEL : Cell 
... (truncated)

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