Office (OLE) / .DOC malware analysis — malicious · cbc4f07f3c3650f1

MALICIOUS

Office (OLE) / .DOC

416.5 KB Created: 2020-12-14 13:59:00 Authoring application: Microsoft Office Word

MD5: 838df14794a2f312ea0368cc6cf584c9 SHA-1: 33ad416465490d21194f069c88912979f8689ffb SHA-256: cbc4f07f3c3650f172552a3849663085f51bc92053cdab9e19dc49dc749d9672

620 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The sample is a malicious OLE document containing VBA macros. The critical 'OLE_VBA_SHELL' and 'OLE_VBA_PCODE_AUTOEXEC_EXEC' heuristics indicate that the 'Document_Open' macro uses the Shell() function to execute an embedded PE executable. This executable was also detected by ClamAV as a keylogger. The overall attack pattern is a macro-based dropper.

Heuristics 16

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
ClamAV: Doc.Dropper.Hancitor-9845854-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Hancitor-9845854-0
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
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 VirtualAlloc API medium SC_STR_VIRTUALALLOC

Reference to VirtualAlloc API
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` `29c3f3935b5a8e5e7e75438c4c31208c6b1248c0a530c7f50ff1196f9a2f50ae`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	3699 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_00021a71.exe` `7813c57e3976130d9fc58fbae36ffea141664fca1f614f2e1f105b44423df4bf`	embedded-pe	Office MZ+PE at offset 0x21A71	288655 bytes
Detection ClamAV: Win.Keylogger.Cridex-9807692-0 Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`ole10native_00.bin` `c865f6907dde57e2e7f537fd8c648cb1a7709c877035cde72cd604e3e48da868`	ole-package	OLE Ole10Native stream: ObjectPool/_1669437929/Ole10Native	250165 bytes

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