Office (OLE) / .DOC malware analysis — malicious · 8a87c11a8e4b0046

MALICIOUS

Office (OLE) / .DOC

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

MD5: 7f9056a0be01d4a37d28c87855516227 SHA-1: ead6fc70906801d45e8490a302b5dcac10e75547 SHA-256: 8a87c11a8e4b004631d5420f059c51d6f868776354ad12a5e076695aabdc744d

282 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell

The sample contains VBA macros, specifically an AutoOpen macro, which is designed to execute automatically. Heuristics indicate the use of WinExec and ShellExecute APIs, along with a direct reference to cmd.exe within the VBA code. This suggests the macro is intended to download and execute a second-stage payload. The heap spray pattern further indicates a potential exploit or obfuscation technique.

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` `b3dfa590780a2a453daf3da7d30cc042a1003504977c46abd829f9f6f96ef93c`	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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