Office (OLE) / .DOC malware analysis — malicious · dc9940e0344075ab

MALICIOUS

Office (OLE) / .DOC

22.0 KB First seen: 2022-11-06

MD5: f358ef1a710785d1976b99cafe3008dc SHA-1: e6b6e37419babb6ee2e814984aaedd97c612f340 SHA-256: dc9940e0344075ab9499ea007793e9ff8177f89b3b76c79f2186826cbd21a067

302 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample contains obfuscated VBA macros that are triggered by the Workbook_Open event. These macros attempt to download a file from the URL 'https://www.mediafire.com/file/g6luj3uyngepzop/4.txt/file' and execute it using Shell.Application. The obfuscation and use of Shell.Application indicate a malicious intent to download and run a second-stage payload.

Heuristics 8

VBA instantiates a dangerous COM class by CLSID critical OLE_VBA_GETOBJECT_CLSID_DANGEROUS

VBA uses GetObject("new:{CLSID}") to instantiate an execution/scripting-capable COM class by its raw CLSID, avoiding the CreateObject ProgID that name-based detection keys on.
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 ShellExecute API high SC_STR_SHELLEXEC

Reference to ShellExecute API
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
GetObject call high OLE_VBA_GETOBJ

GetObject 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
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 https://www.mediafire.com/file/g6luj3uyngepzop/4.txt/file

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `07a011b09615e0664ac294efc76ee438ce01a16618e0ba2f1038995151630629`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2474 bytes

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