RTF / .DOC malware analysis — malicious · 41fb65b6794c33a1

MALICIOUS

RTF / .DOC

383.9 KB

MD5: c99b83b7ae7fe5bb0a17fec704736e4c SHA-1: 09135d44ba26fff5bb9c7dd2d4231f9c3e7a9bbe SHA-256: 41fb65b6794c33a19ddb580204ad1f8fff97f235a49fda9faa90d670d0fc8bfb

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 \objdata and \objupdate to force OLE activation. This suggests the document is designed to exploit vulnerabilities related to OLE object handling, likely leading to the execution of embedded malicious code. No scripts were extracted, but the presence of embedded binary data points to a dropper or exploit delivery mechanism.

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` `08917efc4f431d51e840354fc234027b57502babd4cb1cc6cfc4049995c2f43a`	rtf-objdata-decoded	RTF \objdata at offset 0x7DE	97615 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00032199.bin` `ad7bf1923f855fca5949d0c557a2a819b106cd84b204870bcc59064eb0c6e331`	rtf-objdata-decoded	RTF \objdata at offset 0x32199	2632 bytes
`objdata_02_off0003373c.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x3373C	12297 bytes

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