Office (OLE) / .DOC malware analysis — malicious · 5e23bdae36d10b3a

MALICIOUS

Office (OLE) / .DOC

36.5 KB Created: 2022-04-11 01:09:00 Authoring application: Microsoft Office Word First seen: 2022-04-11

MD5: c9ee2b6dbee4f293e2e2dbaf490e254b SHA-1: ec365d254c19e6be8a0410bea87d90fd9b5069ac SHA-256: 5e23bdae36d10b3aed9934a2cc93304ce8917da2d1268910545881e61cc92477

370 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File

The sample is a malicious Office document containing obfuscated VBA macros. The AutoOpen macro triggers a function that downloads an executable file from 'http://transfe.sh/LK6XeD/FRANK.exe' using an HTTP GET request. The downloaded file is saved as 'FRANK.exe' in the user's temporary directory and then executed. This indicates a downloader or droppper functionality.

Heuristics 10

VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC

VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
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.
ClamAV: Doc.Malware.Valyria-6923224-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.Valyria-6923224-0
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
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
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)
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` `53581857eec04abc96c5254773559c17f784e54bd5bf45ea69b1d8854f99c5ba`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	3421 bytes

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