Office (OLE) / .DOC malware analysis — malicious · a63e5b77cebdfd4a

MALICIOUS

Office (OLE) / .DOC

4.30 MB Created: 2021-03-09 14:29:00 Authoring application: Microsoft Office Word

MD5: 321795beb3a3c9183639a0d5b82c7ae1 SHA-1: ae82915e9fe1b8b2f5224c74f145f80431b5443e SHA-256: a63e5b77cebdfd4afd70c7f80ed4d962d5d16ea67c27c2355dab2cf583365f96

282 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The presence of VBA macros, specifically an AutoOpen macro, combined with references to WinExec, ShellExecute, and cmd.exe, strongly indicates an attempt to execute arbitrary code. The heap spray heuristic suggests sophisticated evasion or exploitation techniques are employed. The AutoOpen macro is designed to run automatically when the document is opened, likely to download and execute a second-stage payload.

Heuristics 10

Heap-spray pattern detected high SC_HEAP_SPRAY

Repeated 0x41 (A) bytes found
Reference to WinExec API high SC_STR_WINEXEC

Reference to WinExec API
Reference to ShellExecute API high SC_STR_SHELLEXEC

Reference to ShellExecute API
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen macro
cmd.exe reference in VBA high OLE_VBA_CMD

cmd.exe reference in VBA
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 VirtualAlloc API medium SC_STR_VIRTUALALLOC

Reference to VirtualAlloc API
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Suspicious extracted artifact info 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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `259733fd9c7e0154cbb3c8813e8c5e3ef9739fad9203b8581a8e2cd6fbf15167`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	44837 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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