Win.Trojan.Razy-9879269-0 — Office (OLE) malware analysis

Static analysis result for SHA-256 4c7572bda2944d1c…

MALICIOUS

Office (OLE)

950.5 KB Created: 2021-07-14 10:48:00
MD5: 19641e46c4e30988781685119af8facb SHA-1: 94c29eef91034d51ec0f4fe34b7d60bc0335f98f SHA-256: 4c7572bda2944d1cca5b2d6c8d700037037f0a7d06d20eb304b95dc769bf0c81
602 Risk Score

Malware Insights

Win.Trojan.Razy-9879269-0 · confidence 95%

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample exploits CVE-2007-3899, a memory corruption vulnerability in Microsoft Word, to achieve code execution. A VBA macro, specifically the Document_Open macro, is then executed. This macro attempts to download and execute a DLL file named 'ier.dll' into the user's template path, likely to establish persistence or download a further payload. The embedded PE executable and OLE package further indicate malicious intent.

Heuristics 15

  • 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.
  • Office EPRINT stream contains EMF object high CVE related OLE_EPRINT_EMF_OBJECT
    OLE ObjectPool contains an EPRINT stream with EMF data. This is rare in normal documents and is CVE-2007-3893/MS07-046-family evidence when paired with Office exploit payload anomalies, but the malformed EMF record is not proven by this rule alone.
  • 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.
  • Embedded PE executable critical OLE_EMBEDDED_EXE
    MZ/PE header found inside document — possible embedded executable
  • ClamAV: Win.Trojan.Razy-9879269-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Razy-9879269-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • Reference to LoadLibrary API high SC_STR_LOADLIBRARY
    Reference to LoadLibrary API
  • Reference to GetProcAddress API high SC_STR_GETPROCADDRESS
    Reference to GetProcAddress API
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • Ole10Native package carries executable/script file type high OFFICE_PACKAGE_RISKY_FILE
    OLE Package displayName or fullPath ends in an executable or script-capable extension. Even without UI extension spoofing, embedding a runnable payload inside an Office document is a high-risk delivery pattern.
  • 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.
  • Reference to VirtualProtect API medium SC_STR_VIRTUALPROTECT
    Reference to VirtualProtect API
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
cd373730e402d9f03abae7f1bf19947d1010e6c9a796db35534731907f4e3852		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3215 bytes
embedded_office_0008ee6e.exe
e8a609c3db5fd7a8d671b31ec9b26e8d2bc1c0d808ae8b58803c2c7925c4ac8d		 embedded-pe Office MZ+PE at offset 0x8EE6E 387986 bytes
Detection
ClamAV: Win.Packed.Zusy-9878765-0
Obfuscation or payload: unlikely
ole10native_00.bin
655b6ee874a330ef24558392537aa2a477f55ab6b8bcc43bab49842668c53d8f		 ole-package OLE Ole10Native stream: ObjectPool/_1687740003/Ole10Native 347436 bytes
Detection
ClamAV: Win.Trojan.Razy-9879269-0
Obfuscation or payload: unlikely

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