Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ea8e70d8f483e64e…

MALICIOUS

Office (OLE)

50.5 KB Created: 1998-06-22 22:28:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: ea635257efef815dac9b4410dc5e3022 SHA-1: 591884c794d52661091199f4581ef25c1c549b23 SHA-256: ea8e70d8f483e64e6b41b4ff2fb12c8f0b48ed5bc3db4e609da1c45e06c9aee0
82 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is a legacy Microsoft Word document containing a WordBasic AutoClose macro. This macro is designed to execute automatically when the document is closed, indicating a malicious intent to run arbitrary code. The macro appears to be obfuscated, and further analysis would be required to determine the exact payload.

Heuristics 4

  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close 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.
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 16111 bytes
SHA-256: c0a12921a00cf390a5654ec6449cf2e6452c959747013a74e41ab89a066479bf
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 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_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Attribute VB_Name = "Ol354"
Rem C293N807B54M314J509Q450H74J572R579O806J796Q692Q192R69F949S219E236U257G713P772R308S718U222I552I204N629D60O837O424E494V768I484M673B647U340D425R357J746
Rem G751U821E108A151I187W871N728D257B827R790H450M802M203F364N343M425N49

Sub AutoClose()

    ' Word2000                       
    ' =======================================                              %W97M. D425R357J746
Rem G751U821E108A151I187W871N728D257B827R790H450M802M203F364N343M425N49

Sub AutoClose()re()

    ' Word2000                       
    ' =======================================             ´s=========                          PN728D257B827R790H450M802M203F364N343MiB647U340D425R357J746
Rem G751U821E108KKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKK========             ´s=========                                              %W97M. D425Ro===================================                 PN728D25============== KKKKKKKKKKKKKKKKKKKKKKKKKK. 1KKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKK========             ´s===4-           ´s===4-           u=====            3B647U340H74J572R579O806J796Q751U821E108A151I18 R151I187Wuõ Nex cÁ     s =========   ====             9

Sub Autable827Rem G7s 0
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.En    CancelKeyQ75wd====
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virus\Virscan.deW8A
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... (truncated)

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