Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3f21a3f101abdbae…

MALICIOUS

Office (OLE)

360.5 KB Created: 2020-07-10 10:41:45 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: 7253441f74b402e427115f84426f7089 SHA-1: 1ceddd73cce540fa873398b9daebdb59ddffb3b4 SHA-256: 3f21a3f101abdbae7910472c0a7feaeaa0973eccd4a72c60a539e86a0c7e1929
182 Risk Score

Malware Insights

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

The sample contains Excel 4.0 macros, specifically an Auto_Open function, which is a strong indicator of malicious intent. The presence of a 'Document signing service impersonation lure' heuristic suggests the document attempts to trick the user into enabling macros. The XLM macros likely execute dangerous functions such as RUN, indicating it's designed to download and execute a second-stage payload.

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) 110241 bytes
SHA-256: 34be4e6d83670855f7a095e92fe8fcafa491fe86f55636cb49ed909b48db4b86
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, very hidden -  Sheet
' 0085      9 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0018     29 LABEL : Cell Value, String Constant - aBbmgyhFoyFBMd len=0 
' 0018     54 LABEL : Cell Value, String Constant - aCKXySxWnOoztMuRBMSOZqGNOYvqUWCJcjZFBBy len=0 
' 0018     36 LABEL : Cell Value, String Constant - aDIVSBOnnPXkMgLjBbCNH len=0 
' 0018     61 LABEL : Cell Value, String Constant - adrNPYidGWoJcWMrBBzFpipUhgwzDuTibLtvQsxLVqErdF len=0 
' 0018     59 LABEL : Cell Value, String Constant - aEigODXNEScLLxxZiuWqVtMXMJDVSpZjplxOPkmvTBdt len=0 
' 0018     60 LABEL : Cell Value, String Constant - aFduVvHBTCYITZVgxNUWfDxbdKQjrgMIIHLwDKbCBRHKC len=0 
' 0018     32 LABEL : Cell Value, String Constant - agzIwcYYXcNGNrSEU len=0 
' 0018     64 LABEL : Cell Value, String Constant - aHNgodJFFDItzHYyxOEHyXBfdLzUKBPZIIuuWfrTnSqJUJGzS len=0 
' 0018     48 LABEL : Cell Value, String Constant - amPiOmEQECvOLhRchepHIdenMsWlSYrzp len=0 
' 0018     44 LABEL : Cell Value, String Constant - aNRqRcWolIeDuqDTiErBYTwyfzFND len=0 
' 0018     32 LABEL : Cell Value, String Constant - aoyhhUHiFRfNeQUti len=0 
' 0018     33 LABEL : Cell Value, String Constant - aPjZQeoXXKwYuHVDUG len=0 
' 0018     45 LABEL : Cell Value, String Constant - aqJdwqgMVVTYKDKoBBQUXPnDvfNQkN len=0 
' 0018     54 LABEL : Cell Value, String Constant - aQvFFDIfmtYkkzEHyXmfPwzUwBPMuIhhJRdGZFc len=0 
' 0018     49 LABEL : Cell Value, String Constant - aRfpYYLxYuIWEVHLkZWQifCYwDyKOcxzJS len=0 
' 0018     18 LABEL : Cell Value, String Constant - aTa len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!GG30324 
' 0018     64 LABEL : Cell Value, String Constant - aVWUZKDKoQBRVXPoRvgbQkbSgqZYMxZvIWEVIMlZXRjgDZxEz len=0 
' 0018     27 LABEL : Cell Value, String Constant - aVxOgBUOEjss len=0 
' 0018     21 LABEL : Cell Value, String Constant - aYGuPF len=0 
' 0018     16 LABEL : Cell Value, String Constant - b len=0 
' 0018     52 LABEL : Cell Value, String Constant - bbOPpyLmHlKcncZTliGpzGCOefBDMjRtKqwQY len=0 
' 0018     36 LABEL : Cell Value, String Constant - BCLVQtJbvPJyenomrcVcH len=0 
' 0018     26 LABEL : Cell Value, String Constant - BCzFpipUhgw len=0 
' 0018     26 LABEL : Cell Value, String Constant - BIlyxOSVMlB len=0 
' 0018     24 LABEL : Cell Value, String Constant - BNNcgjbzP len=0 
' 0018     42 LABEL : Cell Value, String Constant - BpmgyvSoNTPaesOQZidHXpKdXNs len=0 
' 0018     27 LABEL : Cell Value, String Constant - BPwOzEeSPJbY len=0 
' 0018     17 LABEL : Cell Value, String Constant - BQ len=0 
' 0018     56 LABEL : Cell Value, String Constant - BQlYiGBegNgmujPYZXczGNrFEUYaSrHyjRTnQVifO len=0 
' 0018     25 LABEL : Cell Value, String Constant - brSRhXaSqU len=0 
' 0018     17 LABEL : Cell Value, String Constant - bz len=0 
' 0018     37 LABEL : Cell Value, String Constant - BzFpwEUutKzDuTwbZHvQHx len=0 
' 0018     37 LABEL : Cell Value, String Constant - CapiSzDXzEScxLxkMhgJqI len=0 
' 0018     24 LABEL : Cell Value, String Constant - CbCNHZJfP len=0 
' 0018     36 LABEL : Cell Value, String Constant - CCBFqjqVhhwBEvUjcMtwR len=0 
' 0018     48 LABEL : Cell Value, String Constant - CDMkRuKqwQYOtopnsdWeIjUkoqiIkPzvj len=0 
' 0018     61 LABEL : Cell Value, String Constant - cfiayOHqZbvYdqBWjXJkHGhPgSWwWhbtqOjIBwIZnJwHeZ len=0 
' 0018     49 LABEL : Cell Value, String Constant - cGkiQFZQHUeNNBBbkwZsYvOaOMGYVrblrn len=0 
' 0018     23 LABEL : Cell Value, String Constant - cHiTjnph len=0 
' 0018     28 LABEL : Cell Value, String Constant - CIEQghDFOlTvM len=0 
' 0018     19 LABEL : Cell Value, String Constant - CioI len=0 
' 0018     42 LABEL : Cell Value, String Constant - cjluSNqsZfyHvbXXWbMTaqRQgWZ len=0 
' 0018     40 LABEL : Cell Value, String Constant - cklvTOrsZgyHwcXYWbMTaqSRh len=0 
' 0018     26 LABEL : Cell Value, String Constant - CKXyTxWnzol len=0 
' 0018     17 LABEL : Cell Value, String Constant - cl len=0 
' 0018     41
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.