Office (OLE) / .DOCX malware analysis — malicious · 4b0b043cbaabdf97

MALICIOUS

Office (OLE) / .DOCX

1.07 MB Created: 2021-05-20 10:16:00 Authoring application: Microsoft Office Word

MD5: de17357c5343026479fcd454c593a8d1 SHA-1: bc78ed0db121aa1a9b132c46a9ea643e36be2aec SHA-256: 4b0b043cbaabdf97a47604f43883f55b358217b430a9407b602358593af5b521

522 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample contains a VBA macro with a Document_Open auto-exec function that utilizes the Shell() function to execute an embedded PE executable. This is further supported by heuristics indicating PEB access, LoadLibrary, GetProcAddress, and VirtualProtect API calls, typical of malware execution. The presence of an embedded executable and the use of VBA for execution strongly suggest a malicious downloader or initial access payload.

Heuristics 14

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.
Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
Embedded PE executable critical OLE_EMBEDDED_EXE

MZ/PE header found inside document — possible embedded executable
PEB access via FS segment (x86) high SC_PEB_ACCESS

PEB access via FS segment (x86)
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
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.
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 — context-specific rules above attribute URLs they actually evaluated; this rule lists URLs that were present in the bytes but were not otherwise tied to a specific finding.

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` `83e5bb7b78842e6cc089e78ca70aa1b0bdc97d050ffbeac6ac77bd23552833de`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1491 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`embedded_office_0008f068.exe` `30eca6f768a81a9a3089bf1fec7e846e02086a64d557c75ea248e882f61a83e8`	embedded-pe	Office MZ+PE at offset 0x8F068	531864 bytes
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` `3150aec4a366f3a8bfe7eb42fd8b0793ac26dc2bd77f0d3dc0f22d3b8f00ecb6`	ole-package	OLE Ole10Native stream: ObjectPool/_1682985893/Ole10Native	505626 bytes

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