RTF / .DOC malware analysis — malicious · 310ae5d5d28e8c79

MALICIOUS

RTF / .DOC

383.7 KB

MD5: 350a4f8c0cfa1a3075e06edfe1048c2e SHA-1: 887adb90e3cb87a397c5ebcb4c9357b2de4309ba SHA-256: 310ae5d5d28e8c79e1773b1fd8848f7553e81aea0c8220bf1973ce4f51045a5d

140 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains multiple embedded OLE objects, with specific heuristics indicating the use of \objupdate and Composite Monikers, strongly suggesting an attempt to exploit OLE object activation. One of the extracted artifacts, objdata_00_off000007d1.bin, is flagged as suspicious due to script execution terms. This indicates the document is likely designed to download and execute a second-stage payload via the embedded OLE objects.

Heuristics 5

Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED

RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
\objupdate forces OLE activation high RTF_OBJUPDATE

RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
OLE object data medium RTF_OBJDATA

RTF contains 3 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000007d1.bin` `7cc585a9f7f548fb83e3dabb964373233e88aef70f9c9141818839a3dc147124`	rtf-objdata-decoded	RTF \objdata at offset 0x7D1	97527 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off000320d6.bin` `ad7bf1923f855fca5949d0c557a2a819b106cd84b204870bcc59064eb0c6e331`	rtf-objdata-decoded	RTF \objdata at offset 0x320D6	2632 bytes
`objdata_02_off00033679.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x33679	12297 bytes

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