Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c9e3b6c234038dc3…

MALICIOUS

Office (OLE)

431.5 KB Created: 2018-05-31 19:58:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: b0ceb6704362dab65ed79cc0ddb82cd4 SHA-1: d2a4e41be59f0eaad9701d1fb476640b3e6fe69f SHA-256: c9e3b6c234038dc32254f1f19606e4ef89e2d353816202c5d145682aa4966fea
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample is a malicious Office document containing VBA macros. The document body explicitly prompts the user to enable macros to decrypt sensitive information, a typical lure for malware droppers. The VBA macro code appears to be obfuscated but is designed to execute further malicious actions, likely involving downloading and executing a second-stage payload, as indicated by the ClamAV detection 'Doc.Dropper.Agent-6567106-0'.

Heuristics 4

  • ClamAV: Doc.Dropper.Agent-6567106-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6567106-0
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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) 1919 bytes
SHA-256: fed245b4509923eb56b7bdb19c85f968bdda86eed108d6168f61b8a65e7dca93
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
Attribute VB_Control = "CommandButton1, 0, 0, MSForms, CommandButton"
Private Sub Dfi()
If ActiveDocument.Variables("xWdHoq").Value <> "toto" Then
hvshYNWnGySsxcC
ActiveDocument.Variables("xWdHoq").Value = "toto"
If ActiveDocument.ReadOnly = False Then
ActiveDocument.Save
End If
End If
End Sub

Private Sub CommandButton1_Click()
Dfi
End Sub

Attribute VB_Name = "SamHZum"
Private Function hBIOoCiVnq(ujkpovPmKJ As Variant, fotrsGTHOB As Integer)
Dim EUKEBTHZRU, VlOzbjkPOq As String, KMBoDvGuCw, GAePituIuz
VlOzbjkPOq = ActiveDocument.Variables("xWdHoq").Value()
EUKEBTHZRU = ""
KMBoDvGuCw = 1
While KMBoDvGuCw < UBound(ujkpovPmKJ) + 2
GAePituIuz = KMBoDvGuCw Mod Len(VlOzbjkPOq): If GAePituIuz = 0 Then GAePituIuz = Len(VlOzbjkPOq)
EUKEBTHZRU = EUKEBTHZRU + Chr(Asc(Mid(VlOzbjkPOq, GAePituIuz + fotrsGTHOB, 1)) Xor CInt(ujkpovPmKJ(KMBoDvGuCw - 1)))
KMBoDvGuCw = KMBoDvGuCw + 1
Wend
hBIOoCiVnq = EUKEBTHZRU
End Function
Function OWlsViHdlNonIul(ByVal ijkPHCcdFp As String) As Boolean
FileExists = (Dir(ijkPHCcdFp) <> "")
End Function
Public Function hvshYNWnGySsxcC()
PxvtOuHS = hBIOoCiVnq(Array(12, 57, 46, 22, 5, 9, 120, 95, 11, 119), 18)
atLyVEnCTYkdOBL = hBIOoCiVnq(Array(26, 63, 36, 15, 33, 21, 63, 3, 51, 80, 28, 15, 86, 53, 9, 28, 86, 6), 0)
CLPcQ = "ExcludedString"
MsgBox atLyVEnCTYkdOBL
NjgDgLdHXBSR = hBIOoCiVnq(Array(30, 63, 67, 54, 98, 94, 119, 20, 70, 40, 62, 6, 27, 84, 12, 57, 95, 26, 43, 33, 68, _
106, 55, 18, 36, 59, 61, 17, 4, 102, 58, 25), 39)
VQDD = hBIOoCiVnq(Array(123, 110, 48, 35, 60, 64, 104, 49, 15, 35, 39), 28)
MsgBox NjgDgLdHXBSR
MsgBox VQDD
End Function

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