Office (OLE) / .DOCX malware analysis — malicious · b7c1d330ae0704a5

MALICIOUS

Office (OLE) / .DOCX

164.5 KB Created: 2020-09-14 11:42:00 Authoring application: Microsoft Office Word First seen: 2020-09-15

MD5: a65953b9196952ef303b81ac3511afe0 SHA-1: 3b2facc2e3b2bf55b7aae868eb14edb9c7da4469 SHA-256: b7c1d330ae0704a55e88453febc87487493166e74f41e8858126b915c055ed5c

300 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The sample contains a Document_Open macro that utilizes CreateObject to initiate a PowerShell stager. This stager is heavily obfuscated using UTF-16LE encoding and appears to be designed to download and execute a second-stage payload. The presence of a critical heuristic for an obfuscated PowerShell stager and the detection by ClamAV strongly indicate malicious intent.

Heuristics 8

ClamAV: Doc.Downloader.Generic-9759992-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Generic-9759992-0
Hidden UserForm PowerShell EncodedCommand stager critical OLE_USERFORM_OBFUSCATED_POWERSHELL

OLE document contains a UTF-16LE form/property string with an obfuscated PowerShell -EncodedCommand payload. The observed macro family reconstructs this hidden string with Split/Join or UserForm property reads and launches it through WMI/COM process creation. This is downloader malware, not an Office CVE exploit.
Suspicious extracted artifact high 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.
VBA macros detected medium 3 related findings OLE_VBA_MACROS

Document contains VBA macro code
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.
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 In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `21906a5a0abde96faec8374301375697a3e8b4bd728c1429248ea92df8224a99`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	25189 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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