Office (OLE) / .DOC malware analysis — malicious · 6a9ae19a175b78a0

MALICIOUS

Office (OLE) / .DOC

12.5 KB First seen: 2022-11-09

MD5: 52b4729b795b2ebe5e6667106a1f32ef SHA-1: 7d264d2b2ee7f3f647a8fbcd5d6dd75129144b9d SHA-256: 6a9ae19a175b78a0afcf6605237d4776072a9c3eacff375b807f9f1c54419161

380 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample contains a VBA macro that is obfuscated and uses `WScript.Shell` to execute a command. The `Document_Open` subroutine triggers an obfuscated loader that reconstructs a command to download and execute a payload from `http://192.168.1.100/payload.exe` using PowerShell. This indicates a downloader or droppper functionality.

Heuristics 9

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER

Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
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.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Suspicious extracted artifact medium 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `a21b334dc31aa636a65eaaf4fd82a99bd8a1763a50c1e92223aece253b6875ac`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2487 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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