Malicious Office (OLE) — malware analysis report

Heuristics 9

• CVE-2007-3899 — Microsoft Word malformed string memory corruption critical CVE likely CVE_2007_3899
  Word OLE document has the MS07-060 malformed-string exploit shape: a Word 97-family FIB points to a malformed DOP/string-table region with an abnormal INT_MAX run, inflated text counters, and exploit payload or Mdropper.Z campaign evidence.
• 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.
• Ole10Native package payload is a download-and-execute script critical OFFICE_PACKAGE_SCRIPT_DROPPER
  The OLE Package's embedded payload contains a script that hosts a shell (PowerShell/WScript/mshta), fetches a remote resource, and executes it — a download-and-run dropper. Embedding such a script inside an Office document via the Object Packager is a direct user-execution delivery technique (MITRE T1204.002), not a benign attachment.
• 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.
• x86 GetPC stub (CALL $+5; POP EAX) high SC_GETPC_CALL
  x86 GetPC stub (CALL $+5; POP EAX)
  Disassembly

  Attempted x86 opcode disassembly

  000982FD  e800000000        call 0x98302
  00098302  58                pop eax
  00098303  055a0b0000        add eax, 0xb5a
  00098308  8b30              mov esi, dword ptr [eax]
  0009830A  03f0              add esi, eax
  0009830C  2bc0              sub eax, eax
  0009830E  8bfe              mov edi, esi
  00098310  66ad              lodsw ax, word ptr [esi]
  00098312  c1e00c            shl eax, 0xc
  00098315  8bc8              mov ecx, eax
  00098317  50                push eax
  00098318  ad                lodsd eax, dword ptr [esi]
  00098319  2bc8              sub ecx, eax
  0009831B  03f1              add esi, ecx
  0009831D  8bc8              mov ecx, eax
  0009831F  57                push edi
  00098320  51                push ecx
  00098321  49                dec ecx
  00098322  8a443906          mov al, byte ptr [ecx + edi + 6]
  00098326  880431            mov byte ptr [ecx + esi], al
  00098329  75f6              jne 0x98321
  0009832B  2bc0              sub eax, eax
  0009832D  ac                lodsb al, byte ptr [esi]
  0009832E  8bc8              mov ecx, eax
  00098330  80e1f0            and cl, 0xf0
  00098333  240f              and al, 0xf
  00098335  c1e10c            shl ecx, 0xc
  00098338  8ae8              mov ch, al
  0009833A  ac                lodsb al, byte ptr [esi]
  0009833B  0bc8              or ecx, eax
  0009833D  51                push ecx
  0009833E  02cd              add cl, ch
  00098340  bd00fdffff        mov ebp, 0xfffffd00
  00098345  d3e5              shl ebp, cl
  00098347  59                pop ecx
  00098348  58                pop eax
  00098349  8bdc              mov ebx, esp
  0009834B  8da46c90f1ffff    lea esp, [esp + ebp*2 - 0xe70]
  00098352  51                push ecx
  00098353  2bc9              sub ecx, ecx
  00098355  51                push ecx
  00098356  51                push ecx
  00098357  8bcc              mov ecx, esp
  00098359  51                push ecx
  0009835A  668b17            mov dx, word ptr [edi]

• Reference to ShellExecute API high SC_STR_SHELLEXEC
  Reference to ShellExecute API
• Reference to GetProcAddress API high SC_STR_GETPROCADDRESS
  Reference to GetProcAddress API
• Suspicious extracted artifact medium 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.
• 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://ocsp.thawte.com0 Embedded OLE package script

  • http://ts-ocsp.ws.symantec.com07Embedded OLE package script
  • http://crl.thawte.com/ThawteTimestampingCA.crl0Embedded OLE package script
  • http://ts-aia.ws.symantec.com/tss-ca-g2.cer0Embedded OLE package script
  • http://ts-crl.ws.symantec.com/tss-ca-g2.crl0(In document text (OLE body)
  • http://schemas.openxmlformats.org/officeDocument/2006/bibliographyIn document text (OLE body)
  • http://schemas.openxmlformats.org/officeDocument/2006/customXmlIn document text (OLE body)
  • http://schemas.openxmlformats.org/drawingml/2006/mainIn document text (OLE body)
  • http://ts-crl.ws.symantec.com/tss-ca-g2.crl0Embedded OLE package script

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