Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c221112f02f36a1e…

MALICIOUS

Office (OLE)

359.5 KB Created: 2020-07-10 10:41:45 Authoring application: Microsoft Excel First seen: 2020-09-15
MD5: 5ab8c1f4d5087c1ad231a6cb418db6e1 SHA-1: e2889db9c6fb083d51f454765a736b2628fad537 SHA-256: c221112f02f36a1e902fcf2fad12faf8a458cbbdfa5cb91d5ec6520f019851e0
242 Risk Score

Malware Insights

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

The sample is an Excel 4.0 macro-enabled workbook that contains an Auto_Open macro. Heuristics indicate the document uses a lure to enable macros and impersonates a document signing service. ClamAV detected it as a dropper. The XLM macro sheet contains a reference to a URL, which is likely used to download and execute a second-stage payload.

Heuristics 7

  • ClamAV: Xls.Dropper.Agent-9116362-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-9116362-0
  • 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) 110283 bytes
SHA-256: 6a1447b4d90b092fb750e48c2a820d40009366fb7658026e66414ff2bad485e2
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, very hidden -  Sheet
' 0085     11 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  dZ
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0018     22 LABEL : Cell Value, String Constant - abZeCJQ len=0 
' 0018     44 LABEL : Cell Value, String Constant - aDHVfBOBnPljMtLwBaBMGYVsOmebm len=0 
' 0018     62 LABEL : Cell Value, String Constant - aHOgoeKFGEJuBIYzyPFIyYBgeMBVLCQaJJvvXfsUoTrJVKH len=0 
' 0018     38 LABEL : Cell Value, String Constant - aKVbXizBWXhFlPeLSksiOJK len=0 
' 0018     64 LABEL : Cell Value, String Constant - amDEZbkIpSiPVowlRNNMRCuCgHsJMPHfJnXTIcTKXhQQEpRnz len=0 
' 0018     20 LABEL : Cell Value, String Constant - amEFa len=0 
' 0018     41 LABEL : Cell Value, String Constant - amOiNlEdEPJbKhRbhdpGVcenLG len=0 
' 0018     54 LABEL : Cell Value, String Constant - aOMGYVrNlrnzDSnoxIDgvOiCvlRabZePIPtHGWZ len=0 
' 0018     60 LABEL : Cell Value, String Constant - aoNOoxKmGkJbBbmgyhFoyFBNdszCLidHJpvPXMsnnmrcj len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!CA20940 
' 0018     31 LABEL : Cell Value, String Constant - aVyBhBHPEjstrwUb len=0 
' 0018     44 LABEL : Cell Value, String Constant - aWiyzVXgElOeLRkshOJJINxqxcDoF len=0 
' 0018     35 LABEL : Cell Value, String Constant - axsWYFYembHQRPUrxFjw len=0 
' 0018     29 LABEL : Cell Value, String Constant - axsWYFZemcIQRP len=0 
' 0018     62 LABEL : Cell Value, String Constant - ayFBMPezBLUPsIbuOJxdmnlqbVcGTSimogGVNxfhDfjxIcq len=0 
' 0018     16 LABEL : Cell Value, String Constant - B len=0 
' 0018     53 LABEL : Cell Value, String Constant - BbaqgjazcIGncwmdrCkkXXyHUvQuTkwlicurPy len=0 
' 0018     47 LABEL : Cell Value, String Constant - BBzFbipUggwzDuTibLsvQswLIqEddFNZ len=0 
' 0018     49 LABEL : Cell Value, String Constant - bfGtrlEBXtSXUfixTUdniMbuOhcRwGHFKu len=0 
' 0018     23 LABEL : Cell Value, String Constant - bguqZmMN len=0 
' 0018     56 LABEL : Cell Value, String Constant - bIlCioIQFkggfkVOVzaMcfiaycHqmbvlcqBjjWJkH len=0 
' 0018     50 LABEL : Cell Value, String Constant - BImyyOSVMlBtdLOiLPdnJWJvWsrUCTFJiJU len=0 
' 0018     30 LABEL : Cell Value, String Constant - biNnZpsvnMpUEzo len=0 
' 0018     59 LABEL : Cell Value, String Constant - bipUggvzDuTibLsvQswLHqEddFNZCVBYqQqCvOxUEPUR len=0 
' 0018     59 LABEL : Cell Value, String Constant - bJaMQpebVnkIdCIEQThDFOYTvMeySMChqqpufYfKXWmp len=0 
' 0018     44 LABEL : Cell Value, String Constant - BKidGIouOWMrmnlqbipGhgwmogGiN len=0 
' 0018     29 LABEL : Cell Value, String Constant - bkJpTiPVowmSNO len=0 
' 0018     43 LABEL : Cell Value, String Constant - BKKINyrydppFJMEcrkUCFZCGUezN len=0 
' 0018     64 LABEL : Cell Value, String Constant - BKWySxVnznlfxuRBLRNZqrNOXucGVCIbjZFzByEohoTtfvzCt len=0 
' 0018     42 LABEL : Cell Value, String Constant - bLWbYjBPXYhGzdfMSltjPKLJOyG len=0 
' 0018     22 LABEL : Cell Value, String Constant - BMROZqF len=0 
' 0018     47 LABEL : Cell Value, String Constant - bRwGHFKhnuZmlCFIzZngRyBVxDQNvJii len=0 
' 0018     56 LABEL : Cell Value, String Constant - BTQmWhnjuMNiktRxbrYexGuaWWUZLELpQCRVYQoSw len=0 
' 0018     51 LABEL : Cell Value, String Constant - bUFmoJlqEBjwWWxGTuPtSjKkvpIqOxIOKVmC len=0 
' 0018     22 LABEL : Cell Value, String Constant - bvOJyem len=0 
' 0018     28 LABEL : Cell Value, String Constant - BvZbIOhpfLGGF len=0 
' 0018     31 LABEL : Cell Value, String Constant - bXizOWXhFzdeLSks len=0 
' 0018     43 LABEL : Cell Value, String Constant - BYISYUgwMTVeCwacJPiqgMHHGLvD len=0 
' 0018     35 LABEL : Cell Value, String Constant - BYTwyflFNDiddchSZgwX len=0 
' 0018     38 LABEL : Cell Value, String Constant - bYuRpurDGVqrBLGjySlFzoU len=0 
' 0018     64 LABEL : Cell Value, String Constant - byUskgsKYthqPJmoVpuDsYhhgkIPWBNNcgjbzPIrZcwZdroXk len=0 
' 0018     61 LABEL : Cell Value, String Constant - BZRNZpFaOXupTVCWbjZFNOMRovDgtsJNQHgvoYGJdGKYUD len=0 
' 0018     19 LABEL : Cell Value, String Constant - cCCd len=0 
' 0018     20 LABEL : Cell Value, String
... (truncated)

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