Office (OLE) malware analysis — malicious · 2f1b72ec0d02dd1b

MALICIOUS

Office (OLE)

901.0 KB Created: 2021-07-06 12:09:00 Authoring application: Microsoft Office Word

MD5: b1a57b1a512c238391ae6638970e182f SHA-1: df7301322793debf51c84a5c207c0875a860a5fc SHA-256: 2f1b72ec0d02dd1bef168ff7fc59617e0b1bd2f283b43df9b6669be237b48104

642 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.005 Visual Basic

The sample exploits CVE-2007-3899, a memory corruption vulnerability in Microsoft Word, to achieve code execution. The embedded VBA macro, specifically the Document_Open subroutine, attempts to write and execute a DLL file named 'niberius.dll' and also attempts to create a Run key entry for 'IAccessible2Proxy'. The presence of embedded PE executables and the ClamAV detections further confirm its malicious nature. The script's intent is to download and execute a second-stage payload, likely the embedded 'embedded_office_0008ec71.exe' or a similarly named DLL.

Heuristics 16

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.Generic-9876346-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Generic-9876346-0
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 CreateProcess API high SC_STR_CREATEPROCESS

Reference to CreateProcess API
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.

Filename	Kind	Source	Size
`macros.bas` `e71d307f9d10461ac01ffd83b84bd3b183b6ceb16528afc94404f1086c39a1ab`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2990 bytes
`embedded_office_0008ec71.exe` `e9352680688f2df736081a7c38fe207a69e43d51cb6b963570c307e7853591b9`	embedded-pe	Office MZ+PE at offset 0x8EC71	337807 bytes
Detection ClamAV: Win.Trojan.Injectorx-9876306-0 Obfuscation or payload: unlikely
`ole10native_00.bin` `e8c3dd29e1941d2332204b3aaefbcfe049ca49b07c9b177aaabed330217da1fb`	ole-package	OLE Ole10Native stream: ObjectPool/_1687053570/Ole10Native	298805 bytes
Detection ClamAV: Win.Trojan.Generic-9876346-0 Obfuscation or payload: unlikely

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