Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 771008be6fe9fdad…

MALICIOUS

Office (OLE)

174.5 KB Created: 2020-06-22 16:20:38 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: 0bace61c8a47314f4b62d0584996ce17 SHA-1: 2743861e1b1e245fc3f37447adefc064cb6bfdfc SHA-256: 771008be6fe9fdad03aabf7f498be67a40bdfdcd104fe30ef5cffc558be810af
100 Risk Score

Malware Insights

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

This Excel 4.0 macro-enabled document uses a common lure to trick users into enabling macros, which is a primary step in delivering malicious payloads. The presence of an Auto_Open defined name indicates that the XLM macros will execute automatically upon opening the workbook. While no specific payload or C2 infrastructure was directly extracted, the technique strongly suggests a downloader or droppper functionality.

Heuristics 3

  • 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.
  • 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

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) 112400 bytes
SHA-256: 7710fa3785b32202d09c73d869aafb46996ce4bbd3b2d17d6a70dced6b760510
Preview script
First 1,000 lines of the extracted script
' 0085      9 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  
' 0085     27 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  txBrRgZJqtOquJTnCo
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0018     58 LABEL : Cell Value, String Constant - aHkBhnHPEjffdiUNUyZLaehZxbGplaukbpziiVIjGSg len=0 
' 0018     42 LABEL : Cell Value, String Constant - aJJwwXgsVoUrKWKHBTQnXhnjvMN len=0 
' 0018     31 LABEL : Cell Value, String Constant - akFSGsTpoRxPCGfG len=0 
' 0018     37 LABEL : Cell Value, String Constant - aLELpDCSVYQoEwgPRlOSgq len=0 
' 0018     24 LABEL : Cell Value, String Constant - aSqGyjRTn len=0 
' 0018     46 LABEL : Cell Value, String Constant - auOIxdmmlpbUbGSShlogFUNwehCeiwH len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  !GP36983 
' 0018     20 LABEL : Cell Value, String Constant - BCXZi len=0 
' 0018     24 LABEL : Cell Value, String Constant - bfFfqkDzW len=0 
' 0018     58 LABEL : Cell Value, String Constant - bIlCioIQFkggfjVOVzaMbfiaycHqmbvlcqBjjWJkHTh len=0 
' 0018     42 LABEL : Cell Value, String Constant - BKKINkrydppFJMEcrkUCFZCGURz len=0 
' 0018     22 LABEL : Cell Value, String Constant - BpKBrGQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - bQkaRfp len=0 
' 0018     22 LABEL : Cell Value, String Constant - bRUMkOs len=0 
' 0018     29 LABEL : Cell Value, String Constant - bRwrsqvgahLmXn len=0 
' 0018     27 LABEL : Cell Value, String Constant - BsSuZXFtOFvJ len=0 
' 0018     47 LABEL : Cell Value, String Constant - BtdMOiLQdnJWKvXtsUCTFJjJUOgeBWun len=0 
' 0018     21 LABEL : Cell Value, String Constant - BuNwTD len=0 
' 0018     54 LABEL : Cell Value, String Constant - BxrKHezYealpEZbkuoSiBVoiYENNMQCuCgssIMP len=0 
' 0018     64 LABEL : Cell Value, String Constant - caIwRIxMWFFrsTcoRkPnGSGDwPMjTdjfrIJegpNuYnUatCrXS len=0 
' 0018     44 LABEL : Cell Value, String Constant - CCdlyauZxPpQbVnWscntpBShoqzXS len=0 
' 0018     55 LABEL : Cell Value, String Constant - CENkRuLrxRZOtppnseXeJjVkorjIlQzvkFulzKss len=0 
' 0018     17 LABEL : Cell Value, String Constant - CF len=0 
' 0018     62 LABEL : Cell Value, String Constant - CgFXiXUOgdBkuBwJZavxHeMoFlrLTInjjinYRYDdPfildCf len=0 
' 0018     46 LABEL : Cell Value, String Constant - cmhLatNgbQvFGEJtmuYlkBFHyYnfQxz len=0 
' 0018     43 LABEL : Cell Value, String Constant - cmVVJJjsFhBgEWiWTNfczjtzvIYZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - cOSrSd len=0 
' 0018     35 LABEL : Cell Value, String Constant - cpcPqNLnVmYcCcnhzwUp len=0 
' 0018     33 LABEL : Cell Value, String Constant - CqLCrGQyymYzWiwevh len=0 
' 0018     38 LABEL : Cell Value, String Constant - cQZxrVXEYdlbHQQPTqxFjvv len=0 
' 0018     37 LABEL : Cell Value, String Constant - CSToqzXFhxekEMBhccbgRK len=0 
' 0018     21 LABEL : Cell Value, String Constant - cXBDjp len=0 
' 0018     24 LABEL : Cell Value, String Constant - cxyISNqGZ len=0 
' 0018     38 LABEL : Cell Value, String Constant - cZwgqwsFVWrtDaIkBhnHPEj len=0 
' 0018     64 LABEL : Cell Value, String Constant - DBuNKgDbgdorHcdmwrVkEXqlaGPQOTEwFivuLPRJixpaIKeHM len=0 
' 0018     19 LABEL : Cell Value, String Constant - ddcg len=0 
' 0018     38 LABEL : Cell Value, String Constant - DeydCTfURLdaxhrxtFWXsuE len=0 
' 0018     22 LABEL : Cell Value, String Constant - dJgyLyv len=0 
' 0018     17 LABEL : Cell Value, String Constant - dm len=0 
' 0018     42 LABEL : Cell Value, String Constant - dMMyyaivXrWuMYNKEWTqakqmyPQ len=0 
' 0018     56 LABEL : Cell Value, String Constant - dMMzlNjvKrJuyZNKEWTqMkqmyCQlnwHCfuNhBukQZ len=0 
' 0018     40 LABEL : Cell Value, String Constant - DNIlBTnHBqWfgejUNUyMLbehZ len=0 
' 0018     28 LABEL : Cell Value, String Constant - dNjTejgrJXfgp len=0 
' 0018     58 LABEL : Cell Value, String Constant - dnLGjlRYryoUPQOTFLSjKJZPSJiLqoWLfVMakTTGGhp len=0 
' 0018     36 LABEL : Cell Value, String Constant - DpcEZmBizlpPEBuNKhDbh len=0 
' 0018     54 LABEL : 
... (truncated)

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