Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 19f3a9906b73b1bf…

MALICIOUS

Office (OLE)

369.0 KB Created: 2020-07-10 10:41:45 Authoring application: Microsoft Excel First seen: 2020-09-07
MD5: 7b7fc3e51dd62c1176b96faef734f25f SHA-1: 92d16b2f8bb30281a42d3b01215e56062f6a96ba SHA-256: 19f3a9906b73b1bff355ed9df5b03d1b815f7a622d0c611cae147a951d704b9c
182 Risk Score

Malware Insights

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

The sample is an Excel 4.0 macro-enabled document that uses an Auto_Open macro. It impersonates a document signing service to lure the user into enabling macros, a common tactic for initial execution. The XLM macro contains dangerous API calls, including one that likely executes code or downloads a payload. No specific family could be identified.

Heuristics 6

  • 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) 119975 bytes
SHA-256: ea3027bdb7f7b86c35414c9c8d7db5b74b4088a3229acb70c459b66b58c2e0ba
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 -  RM
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0018     52 LABEL : Cell Value, String Constant - aDigODXNEScLLxxZhuWqVtLXMJDVSoYjplwOP len=0 
' 0018     36 LABEL : Cell Value, String Constant - aehZxNGpXauXbpmViIIjr len=0 
' 0018     63 LABEL : Cell Value, String Constant - afQXeuVVlbdVuXCzhWqhYlwfeSStCOqKpOfrfdXpmJsEJGRi len=0 
' 0018     39 LABEL : Cell Value, String Constant - agcnFTbcmKFijQXpxnTOPNSE len=0 
' 0018     33 LABEL : Cell Value, String Constant - agcoFUbdmKFikRXqyn len=0 
' 0018     48 LABEL : Cell Value, String Constant - ahisQLoqWdwEtZUVTYKQXoPOeUXOnQvtb len=0 
' 0018     21 LABEL : Cell Value, String Constant - aJJviJ len=0 
' 0018     55 LABEL : Cell Value, String Constant - aoyhhUHhERfMeQUtifZroLhGMITWlHISbWzQiDWQ len=0 
' 0018     17 LABEL : Cell Value, String Constant - aq len=0 
' 0018     38 LABEL : Cell Value, String Constant - aqGbPYvqUWDWckZFOPNSpvE len=0 
' 0018     55 LABEL : Cell Value, String Constant - areiIvtnGDZvUZWhkzVWfpkOdwQjeTyIJHMwpxbo len=0 
' 0018     22 LABEL : Cell Value, String Constant - asBqWRS len=0 
' 0018     29 LABEL : Cell Value, String Constant - aspNiHNJVYmIKT len=0 
' 0018     58 LABEL : Cell Value, String Constant - aTParGbPZwrVWDXckaGPPOTpwEivuLORJhwpZIKeHMZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - aUmVscmso len=0 
' 0018     46 LABEL : Cell Value, String Constant - auNIxdlmkpbUbGSShlofFUNwehCeiwH len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!EX31835 
' 0018     60 LABEL : Cell Value, String Constant - aWhlzVXgpkOewRkeUzJJHMxqxcooEILDbqjTBEYBFTdyM len=0 
' 0018     18 LABEL : Cell Value, String Constant - baq len=0 
' 0018     41 LABEL : Cell Value, String Constant - BbNcgjbzdIrncwmdrCkkXKlHUi len=0 
' 0018     57 LABEL : Cell Value, String Constant - bcJdiqgMVVUZvDKoCBRUXPnDvfOQkNSfcLYxxZhuWp len=0 
' 0018     27 LABEL : Cell Value, String Constant - bcxzJgOrHntN len=0 
' 0018     49 LABEL : Cell Value, String Constant - BcyLZHYKOocaUmjGcBGDORgCDMWRuKdwQL len=0 
' 0018     17 LABEL : Cell Value, String Constant - bd len=0 
' 0018     58 LABEL : Cell Value, String Constant - BdhvrboOOpxKmGlJbBbmgyiFozFCNesBCLjdHJpvPXN len=0 
' 0018     63 LABEL : Cell Value, String Constant - BdivHbocOpMLmUlXbCcnhzwToOGCNetPDMjeIKqKQYNsCDBG len=0 
' 0018     55 LABEL : Cell Value, String Constant - BDMWRuKcwQKzfoonsdWdIVUknqiHWPyhjEglyJer len=0 
' 0018     18 LABEL : Cell Value, String Constant - BDX len=0 
' 0018     40 LABEL : Cell Value, String Constant - BegNgmujPYZXczGOrFEUYaSrH len=0 
' 0018     44 LABEL : Cell Value, String Constant - bEIWSBPooPYkNgMjCbCNHZJfPZfbn len=0 
' 0018     59 LABEL : Cell Value, String Constant - BfGrHLOGeImWSHbRIWgPPCoQmyNuMxCbQNHZWtPntpCF len=0 
' 0018     33 LABEL : Cell Value, String Constant - BGcjqVihxBEvUjcMuw len=0 
' 0018     33 LABEL : Cell Value, String Constant - BgppnsQXeJVVkorjIX len=0 
' 0018     58 LABEL : Cell Value, String Constant - BIxdYZXcOHOsTFUYbTrUzjfUoeVjtccPCdyMaIZLPod len=0 
' 0018     43 LABEL : Cell Value, String Constant - bLWcYjBCXZiGmQgNTmujPLLKOzsz len=0 
' 0018     24 LABEL : Cell Value, String Constant - BNbJaMQqe len=0 
' 0018     62 LABEL : Cell Value, String Constant - BNdezCLiQtJpvPXNsnnmrcVcHhTjmphGjOxtiDtkxIrqeQr len=0 
' 0018     31 LABEL : Cell Value, String Constant - bnQjPmFRFDwPMiSd len=0 
' 0018     33 LABEL : Cell Value, String Constant - boQkPnFfGRLdMiSdjf len=0 
' 0018     60 LABEL : Cell Value, String Constant - BRgnpyWRuwdjDLzgbYXbNTbrSRhXaSqUyweTndUisbbOP len=0 
' 0018     51 LABEL : Cell Value, String Constant - BRHJBaDhfOCXNEScLLxxZhuWpVtLXLJDVSoY len=0 
' 0018     21 LABEL : Cell Value, String Constant - brSShY len=0 
' 0018     57 LABEL : Cell Value, String Constant - bRUMkOsqYNhYOcmVVIJjsFhBfEWiWTNfczjtzvIYZu len=0 
' 0018     33 LABEL : Cell Value, String Constant - BSgopyXRuwdjDLBgbc len=0 
'
... (truncated)

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