RTF / .DOC malware analysis — malicious · a3f600d0d1de53ee

MALICIOUS

RTF / .DOC

383.9 KB

MD5: 9a802b83f597cbb0adaabed57442bc50 SHA-1: b2b9b3fb8a423885f2971fe557637ab7bf84f53d SHA-256: a3f600d0d1de53ee5f125b1fe51f90c393f74125767abe5bb7cb07725124d76d

140 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains multiple 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_off000007de.bin, is flagged as a suspicious extracted artifact with signals related to script execution. This indicates the file likely attempts to download and execute a second-stage payload.

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_off000007de.bin` `ce3fb7a59983435cbcf4737d5ec9cfb4dbee085e80e89573d25ee3b2e8f14643`	rtf-objdata-decoded	RTF \objdata at offset 0x7DE	97619 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off000321a3.bin` `ad7bf1923f855fca5949d0c557a2a819b106cd84b204870bcc59064eb0c6e331`	rtf-objdata-decoded	RTF \objdata at offset 0x321A3	2632 bytes
`objdata_02_off00033746.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x33746	12297 bytes

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