Office (OLE) / .DOC malware analysis — malicious · 827866089f958b9d

MALICIOUS

Office (OLE) / .DOC

368.0 KB Created: 2020-11-25 11:42:00 Authoring application: Microsoft Office Word

MD5: bdba9e0cbaa81843d8a651ed0098a9fd SHA-1: a105d9e6bb732093237bc2d555478c9a8a54bb6d SHA-256: 827866089f958b9df535168bc3efed843ee0d769cbe015758d90f9199f7b0d25

620 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1106 Native API T1204.002 Malicious File

The sample is a malicious OLE document containing VBA macros. The AutoOpen macro is configured to execute a Shell command, which likely launches the embedded PE executable. ClamAV detections indicate this is a dropper for Hancitor, Cridex, and Zusy malware families. The embedded executable and the VBA macro itself are the primary IOCs.

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
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen 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` `bb2c6977abdda1c6cc965a8fcead4d99a2b9747fb5fbe999b06343b8ac9bda3a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	3327 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_00021a73.exe` `f5b1421c80825a3afcdf21a359191bbd8054fb2404afb8085083c2c78f9347c3`	embedded-pe	Office MZ+PE at offset 0x21A73	238989 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` `90abad743af90cade9dd1909c45e201b7528e1dc1d4730c4a498ca47dccbaea4`	ole-package	OLE Ole10Native stream: ObjectPool/_1667788122/Ole10Native	192827 bytes
Detection ClamAV: Win.Malware.Zusy-9891271-0 Obfuscation or payload: unlikely

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