Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3f56eaa38eace04e…

MALICIOUS

Office (OLE)

295.5 KB Created: 2020-07-10 10:41:45 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: 393ded3846127150dc6b7dbd2dc32082 SHA-1: a2b57df48dd77bbd46718ad9d4bc82fc710984aa SHA-256: 3f56eaa38eace04eaaee759ab6d855ef9555f66d472106099a42ab31c3f746ec
242 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 macros, specifically an Auto_Open function, which is a critical indicator of malicious intent. The macros utilize dangerous API calls like RUN, suggesting the execution of arbitrary code. The presence of an embedded URL and the ClamAV detection further support its classification as a dropper. The document also attempts to lure the user into enabling macros, a common social engineering tactic.

Heuristics 7

  • ClamAV: Xls.Dropper.Agent-8780923-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8780923-0
  • 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
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns# In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/mm/In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/In document text (OLE body)

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) 47676 bytes
SHA-256: 41392d4d466329c6d08b2f052f2f5e7d8fc18f794910e4397ec20b9b24f5780a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, very hidden -  Sheet
' 0085     10 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  w
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0018     46 LABEL : Cell Value, String Constant - aBMGYVrNmealDSnbkIDgiPiowlRabZe len=0 
' 0018     58 LABEL : Cell Value, String Constant - aMnKWkSjVZznlfxuRmMROZcrNOXhcGVoIbWLqzByEoh len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!IX35086 
' 0018     35 LABEL : Cell Value, String Constant - aXizOjXgFyceLfksiOXX len=0 
' 0018     44 LABEL : Cell Value, String Constant - aycHqmbvmdqBjjXJkHThPgSWwkhbt len=0 
' 0018     60 LABEL : Cell Value, String Constant - ayfJYFLemcIDECHrksWxiyDFwWydOKxSJzOYHGtgHdpFl len=0 
' 0018     55 LABEL : Cell Value, String Constant - bIDDCHryGWwvMCFwVydbJxSJzNXGGttUdpSlRoHT len=0 
' 0018     64 LABEL : Cell Value, String Constant - BkHqCHEPguDENlfJLrxRZPupqotelsJjjzprjJlQOvkFvmzLt len=0 
' 0018     36 LABEL : Cell Value, String Constant - bvBJyennlqOVcHTTimphG len=0 
' 0018     57 LABEL : Cell Value, String Constant - bVnXtdouqCThpqBYTwxelEMChcdbgSYfvXWmcfWvYE len=0 
' 0018     60 LABEL : Cell Value, String Constant - BwJaawxHeMpFlrLTJojkinYRYDdPfildDfKupeypgtEnm len=0 
' 0018     55 LABEL : Cell Value, String Constant - bWXVaLSZpQQfWYQpSwucRlcTgraZNNowJlFkIama len=0 
' 0018     51 LABEL : Cell Value, String Constant - CDYajHoShOUnvlRMMLQBtBfGrILOGeImWSHb len=0 
' 0018     49 LABEL : Cell Value, String Constant - cFlEptTtFyROkHfXTfvLgUdBvZbIchpfLT len=0 
' 0018     45 LABEL : Cell Value, String Constant - CfvOiCvlRaaZePIPtHGWZcUsIBkTVp len=0 
' 0018     47 LABEL : Cell Value, String Constant - CIPtHGWacUtJBlTVpSXkhQdDDenzbvay len=0 
' 0018     17 LABEL : Cell Value, String Constant - Cj len=0 
' 0018     28 LABEL : Cell Value, String Constant - cPqMZnVmYcCqn len=0 
' 0018     60 LABEL : Cell Value, String Constant - ctIQRaxsWYFLemcIDECHryGWwwMCFwVydbJxSJzNXHGtt len=0 
' 0018     28 LABEL : Cell Value, String Constant - CVBYqDqoiBxUE len=0 
' 0018     32 LABEL : Cell Value, String Constant - dcswyqQeXIprMotHE len=0 
' 0018     55 LABEL : Cell Value, String Constant - DfjxIcqdQqNMoWnZdDdoiBxUqPHDPguQENkfJLrM len=0 
' 0018     25 LABEL : Cell Value, String Constant - DnVXrUZnjS len=0 
' 0018     23 LABEL : Cell Value, String Constant - dOvxSuzO len=0 
' 0018     54 LABEL : Cell Value, String Constant - dpGHcenLsVlSYrzoUQQPUFxFjKvMPSKiMqaWLfW len=0 
' 0018     29 LABEL : Cell Value, String Constant - DptTHFyROkHflh len=0 
' 0018     22 LABEL : Cell Value, String Constant - DRZakID len=0 
' 0018     59 LABEL : Cell Value, String Constant - DSWZRpFxhPSmPThrNaNzbwvYGXJNmNYSkhFayqnyQezn len=0 
' 0018     42 LABEL : Cell Value, String Constant - fHdcElDptTtFyROkHfXTfvLgUdB len=0 
' 0018     36 LABEL : Cell Value, String Constant - fjxTVeoiMcuPicSxHHGKv len=0 
' 0018     26 LABEL : Cell Value, String Constant - FLTInwxvBYe len=0 
' 0018     60 LABEL : Cell Value, String Constant - fVMakTTGGhpDeydCTfURLdaxhrxtGWXsuEbIlCioIQFkg len=0 
' 0018     24 LABEL : Cell Value, String Constant - FXHdNYeal len=0 
' 0018     50 LABEL : Cell Value, String Constant - FxhQSmPUheNazzbjwYrXvNnNYSkUqalrnyQ len=0 
' 0018     17 LABEL : Cell Value, String Constant - gf len=0 
' 0018     43 LABEL : Cell Value, String Constant - ghOVnvlRMNLQBIPfHGWMPGfInkTH len=0 
' 0018     45 LABEL : Cell Value, String Constant - GJMEcrkUDFZCHURzNmmOWiLeKizazL len=0 
' 0018     24 LABEL : Cell Value, String Constant - GQyymmNWi len=0 
' 0018     54 LABEL : Cell Value, String Constant - GurlEBXtSYUfixTUeniMcuPicSxGHFKvovammCG len=0 
' 0018     28 LABEL : Cell Value, String Constant - hCsiwHppcPqNZ len=0 
' 0018     57 LABEL : Cell Value, String Constant - HExQOkUekgsJKfhqOvZoVbuDsYTUSXIBImNyPSVNlP len=0 
' 0018     17 LABEL : Cell Value, String Constant - HF len=0 
' 0018     63 LABEL : Cell Value, String Constant - hFLSwKJZdfXwMEoWYsVankTgGGhqDeydCUtUfZraxhrxtGWl len=0 
' 0018     55 LABEL : Cell Value, String Constan
... (truncated)

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