Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2bf0974fa472c6f5…

MALICIOUS

Office (OLE)

341.0 KB Created: 2020-07-10 10:41:45 Authoring application: Microsoft Excel First seen: 2020-09-07
MD5: 83b34045f9e6a47db435563781043771 SHA-1: 3b26dbe25ab59afab691a3f2f5b3c48fab652b23 SHA-256: 2bf0974fa472c6f54f605485ce08ca11b1938290a4d2e703d375430989861453
242 Risk Score

Malware Insights

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

The sample contains Excel 4.0 macros, including an Auto_Open entry, which is a strong indicator of malicious intent. The document body is obfuscated, but heuristics indicate it uses a lure to enable macros, impersonating a signing service. The presence of XLM macros and the lure suggest the file is designed to execute a secondary payload, likely a downloader.

Heuristics 7

  • ClamAV: Xls.Dropper.Agent-8903522-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8903522-0
  • 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) 91755 bytes
SHA-256: 505fb5cdee5e3fd78981c638c01a9c1b15ec6d0b707f3974afd2a7b05d1ecb9c
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 -  n
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0018     22 LABEL : Cell Value, String Constant - aBalfxu len=0 
' 0018     35 LABEL : Cell Value, String Constant - aBMGYVsOmebmESnbkJEg len=0 
' 0018     23 LABEL : Cell Value, String Constant - aBXkyfxj len=0 
' 0018     54 LABEL : Cell Value, String Constant - adUtWClhWqgXlveeREeBOcKbNRqfcWolIeDJFQU len=0 
' 0018     35 LABEL : Cell Value, String Constant - aeEepjCyVrQIEQgvRFOl len=0 
' 0018     40 LABEL : Cell Value, String Constant - akUTHsUqDRyQCGgUSMebxTsxu len=0 
' 0018     39 LABEL : Cell Value, String Constant - alrnyQemnwVQsubhBJyeZaYd len=0 
' 0018     60 LABEL : Cell Value, String Constant - anyhgUUvEQsMrPhthfZroLuGLITklHIRpWzPvCVdTytus len=0 
' 0018     25 LABEL : Cell Value, String Constant - aptwoNqVFB len=0 
' 0018     37 LABEL : Cell Value, String Constant - aPuEFDIflsXkjzEGxXlePw len=0 
' 0018     33 LABEL : Cell Value, String Constant - aUmjGbBsozRgCoyWRu len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!JE50392 
' 0018     34 LABEL : Cell Value, String Constant - aXizOWXgFzceLRksiOJ len=0 
' 0018     56 LABEL : Cell Value, String Constant - ayqmyQeznwUPsubvBJyennlqOVcHTTimphGVOxfiD len=0 
' 0018     25 LABEL : Cell Value, String Constant - azPHrZbvYd len=0 
' 0018     33 LABEL : Cell Value, String Constant - azzbjvYrXvNmNYSkUq len=0 
' 0018     16 LABEL : Cell Value, String Constant - b len=0 
' 0018     33 LABEL : Cell Value, String Constant - BImOyPTVNmPteZOiZQ len=0 
' 0018     55 LABEL : Cell Value, String Constant - bkIDgiPjowmSabZeCJQuHHWadUtJClTWqTXlhReE len=0 
' 0018     33 LABEL : Cell Value, String Constant - bKJwwYgsVoUsKWKICU len=0 
' 0018     33 LABEL : Cell Value, String Constant - bLWcYjBCXYiGmQgMTm len=0 
' 0018     40 LABEL : Cell Value, String Constant - BmDGJBZDhRNCWNERbLKxjLhtI len=0 
' 0018     23 LABEL : Cell Value, String Constant - bmEFaclJ len=0 
' 0018     62 LABEL : Cell Value, String Constant - BmfmRrdtwzrQtYIEsNDtISBBnaCYkygxjnNCysLIfBZfbnq len=0 
' 0018     43 LABEL : Cell Value, String Constant - bMTaqRQgWZRpTxvdSmdUhraaOOox len=0 
' 0018     63 LABEL : Cell Value, String Constant - BNHYIeOZfbmESablJEhiPWowmSNOMRDJQhIHXNQHgJomUJdT len=0 
' 0018     31 LABEL : Cell Value, String Constant - bnnDHKCapiSzDXzE len=0 
' 0018     36 LABEL : Cell Value, String Constant - BNQezCLVQsJbvPJyennmr len=0 
' 0018     48 LABEL : Cell Value, String Constant - BpVefdiGMTxLKaegYxNFpXZtWbolUhHHi len=0 
' 0018     52 LABEL : Cell Value, String Constant - BQGJBZDhfNCWNERbLKxxZhtWpVsLXLJDVSoYj len=0 
' 0018     18 LABEL : Cell Value, String Constant - bvl len=0 
' 0018     56 LABEL : Cell Value, String Constant - bvYdqBWjXJkHGhPgSWwXicurOjJBwIZoKxHeZDFlF len=0 
' 0018     31 LABEL : Cell Value, String Constant - bwyIfMpGmsMUJokk len=0 
' 0018     57 LABEL : Cell Value, String Constant - BxVqPIEPguQEOlgKLrMRZPuEEDIelsXkjzDGxWleOw len=0 
' 0018     44 LABEL : Cell Value, String Constant - bZePWdtUUjZcUtWBygVpgXkvedRRs len=0 
' 0018     62 LABEL : Cell Value, String Constant - cHfwJxuoHEbLVbXizBWYhFlPfMSltiOKKJNyrydEpFJMEcG len=0 
' 0018     24 LABEL : Cell Value, String Constant - chHhsmFCY len=0 
' 0018     56 LABEL : Cell Value, String Constant - CjBmqRrDwPMiEdVRctJeRbytXZGZfncIRSQVsyGkx len=0 
' 0018     33 LABEL : Cell Value, String Constant - CjNcJPiqgMHHGLvova len=0 
' 0018     28 LABEL : Cell Value, String Constant - CJQuHHWadVtJC len=0 
' 0018     33 LABEL : Cell Value, String Constant - ckwZsYvOaOMGYVrbmr len=0 
' 0018     47 LABEL : Cell Value, String Constant - ckZFBByEpipUugvzDuTwbLHvQGwLVEEq len=0 
' 0018     48 LABEL : Cell Value, String Constant - ClvCxKapwyIfaEGmsMUJokkjoZfnEedtj len=0 
' 0018     27 LABEL : Cell Value, String Constant - CLXzTyWoBolf len=0 
' 0018     54 LABEL : Cell Value, String Constant - ctIQRbytXYFLemcIDECHryGWxwNDGwWydbKxTJz len=0 
'
... (truncated)

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