Office (OLE) / .DOC malware analysis — malicious · 9857b0a657e35746

MALICIOUS

Office (OLE) / .DOC

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

MD5: d40ee9c8e2047bf8391d45ff1b067dda SHA-1: 0d327f54a14d9515f3818a23ec6ff3f5df8d4f29 SHA-256: 9857b0a657e357460e67f1f1830ec8e461f3c84115a466f9eee3af32c92e2e20

282 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Service Execution: Service Execution T1059.003 Command and Scripting Interpreter: Windows Command Shell T1204.002 Malicious File: Malicious File T1059.001 Command and Scripting Interpreter: PowerShell

The sample is a malicious OLE document containing VBA macros. The AutoOpen macro is present and executes cmd.exe via ShellExecute, indicating an attempt to download and execute a second-stage payload. Heap spraying and references to WinExec and VirtualAlloc further support a malicious intent. The specific family is not identifiable from the available heuristics.

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` `ac1574b6b687e709b63b7f59eeb4fe406aa40d1e0e9595d9fdbe667e608abc25`	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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