Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6c5003ef79ee398f…

MALICIOUS

Office (OLE)

335.5 KB Created: 2020-07-10 10:41:45 Authoring application: Microsoft Excel First seen: 2020-09-24
MD5: 4d0014d95338a38d6d8a725038364e1a SHA-1: 536b3101afc4c66d4848e01f1d5519e981e404a3 SHA-256: 6c5003ef79ee398fc40505910558d0d7d90ea152cc3c25d474559c73bceb0588
182 Risk Score

Malware Insights

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

The sample contains Excel 4.0 macros, including an Auto_Open entry, which is a strong indicator of malicious intent. The presence of a 'Macro/content-enable lure' heuristic and the impersonation of a document signing service suggest the file attempts to trick users into enabling macros. The XLM macro sheet contains a defined name 'Auto_Open' and uses dangerous formula APIs, indicating it's designed to execute automatically upon opening. While specific URLs extracted are benign, the overall structure points to a macro-based downloader.

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) 86438 bytes
SHA-256: 8aab634a1f6e8b7398e4d961de1404243120a22ac03b9806c61b8dcac091c277
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 -  l
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0018     18 LABEL : Cell Value, String Constant - aDk len=0 
' 0018     26 LABEL : Cell Value, String Constant - aeFsqkDzWsR len=0 
' 0018     53 LABEL : Cell Value, String Constant - ahBIxdYZXcOHOsTFUYbSrUzjfUoeVjtccPCdyM len=0 
' 0018     44 LABEL : Cell Value, String Constant - aiXDyyxDngnSseuxBsRuZJFtOFuJT len=0 
' 0018     63 LABEL : Cell Value, String Constant - aIZLPodaUmjHcBHDOSgCENXRuLdxRLBgpposeXeJVVkorjIX len=0 
' 0018     46 LABEL : Cell Value, String Constant - aIZLPpPaUmkHcBtpBSgCpzXSvwdxDLB len=0 
' 0018     23 LABEL : Cell Value, String Constant - ajjhmKRY len=0 
' 0018     52 LABEL : Cell Value, String Constant - aOMGYVrNmrozDSnoxIDgvPiCwlRabZePIPtHG len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!JI53038 
' 0018     32 LABEL : Cell Value, String Constant - axsWYFYembHQRPUry len=0 
' 0018     19 LABEL : Cell Value, String Constant - BaDi len=0 
' 0018     29 LABEL : Cell Value, String Constant - BDMWRuKcwQKzfo len=0 
' 0018     42 LABEL : Cell Value, String Constant - bDZlzhykoPDBuNKgDbgdorHcdmw len=0 
' 0018     41 LABEL : Cell Value, String Constant - bFUnHaVKpyzxDngnSfeuyBsShZ len=0 
' 0018     17 LABEL : Cell Value, String Constant - BG len=0 
' 0018     19 LABEL : Cell Value, String Constant - BIly len=0 
' 0018     25 LABEL : Cell Value, String Constant - BmOkwLsKvz len=0 
' 0018     43 LABEL : Cell Value, String Constant - BpmgyvSoNTPaesOQZidHXpKdXNsC len=0 
' 0018     45 LABEL : Cell Value, String Constant - bqjTCEYBGTQyMllNViKeJhyZzLFXGc len=0 
' 0018     41 LABEL : Cell Value, String Constant - BSEIhITNfczVtlitLZuirQLnpW len=0 
' 0018     48 LABEL : Cell Value, String Constant - bseiIwtnGDavUaWilzVXgqlOewRkeUzJJ len=0 
' 0018     41 LABEL : Cell Value, String Constant - BSFJiJUOgdzWumiuLavjsQLoqX len=0 
' 0018     35 LABEL : Cell Value, String Constant - bSfpZYMMmvIkEjHZlZXR len=0 
' 0018     30 LABEL : Cell Value, String Constant - bstPQaxeIXELdlb len=0 
' 0018     56 LABEL : Cell Value, String Constant - btCrXSTRWIOVlNMcSVMlOtrZOiYPdnWWJJksGhCgF len=0 
' 0018     26 LABEL : Cell Value, String Constant - btodKSTRWHB len=0 
' 0018     36 LABEL : Cell Value, String Constant - BUcRwssrwhahMmYorumLo len=0 
' 0018     35 LABEL : Cell Value, String Constant - BuNLhDbUQbsHdQaxsWXE len=0 
' 0018     30 LABEL : Cell Value, String Constant - bVnXtdotqCThpqz len=0 
' 0018     22 LABEL : Cell Value, String Constant - bzGCORf len=0 
' 0018     60 LABEL : Cell Value, String Constant - caIwRIyMWFFssTcoRkQnGSGDwPNjTdjfrJJfgpNuYnUat len=0 
' 0018     28 LABEL : Cell Value, String Constant - CCdlyatZxPpPa len=0 
' 0018     43 LABEL : Cell Value, String Constant - cDCSILDbEjhPEYOFTdMMyyaivXrW len=0 
' 0018     19 LABEL : Cell Value, String Constant - CegN len=0 
' 0018     56 LABEL : Cell Value, String Constant - CfKtpeypgtEmmaMnKWkSjVZznkewuRmLRNZcqNOXh len=0 
' 0018     61 LABEL : Cell Value, String Constant - cGVnIbVLqzByEohoTgfvyCtThaLsuPrwKUpDqcEaZBizlp len=0 
' 0018     23 LABEL : Cell Value, String Constant - cNGNrSEU len=0 
' 0018     59 LABEL : Cell Value, String Constant - CnrRrDwPMjFdVSduJeSbzuXZGafndJSSRWszHlyxORUM len=0 
' 0018     42 LABEL : Cell Value, String Constant - cNUbrSShXaSqUyweTneViscbPPq len=0 
' 0018     46 LABEL : Cell Value, String Constant - CooQYlNhMkCODztMJgQagcoFGbdmKqU len=0 
' 0018     25 LABEL : Cell Value, String Constant - coRkQnGfGR len=0 
' 0018     37 LABEL : Cell Value, String Constant - CQmZjHCfgNhmukQZaYdBHO len=0 
' 0018     28 LABEL : Cell Value, String Constant - CRJtbdxaftpYl len=0 
' 0018     36 LABEL : Cell Value, String Constant - CRKtbeybftpZmMMmvIkEj len=0 
' 0018     24 LABEL : Cell Value, String Constant - CrXSTRWHz len=0 
' 0018     30 LABEL : Cell Value, String Constant - CShoqzXSvxekEMC len=0 
' 0018     20 LABEL : Cell Value, Strin
... (truncated)

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