RTF / .DOC malware analysis — malicious · c189a5878c860c31

MALICIOUS

RTF / .DOC

383.4 KB

MD5: 2c8781d207498674a3512fd42a4b093f SHA-1: c7145a8dd8dd20b7f87c3798ba1cd696b727637b SHA-256: c189a5878c860c3172b87a193414ea838ac970b132636a22336b9d7726f59f34

140 Risk Score

Malware Insights

MITRE ATT&CK

T1559.001 Component Object Model T1059.001 PowerShell

The RTF document contains multiple OLE objects, with specific heuristics indicating the use of ".objupdate" and Composite Monikers, strongly suggesting an exploit targeting OLE object activation. One of the extracted artifacts, objdata_00_off000007de.bin, is flagged as suspicious due to script execution terms. This indicates the document is likely designed to drop and execute a secondary payload, leveraging the OLE vulnerability for initial execution.

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` `8aea0bdca923f1d83734b45d13753f89be828e03aa2edc64eca98b49af9a69e3`	rtf-objdata-decoded	RTF \objdata at offset 0x7DE	97381 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00031fb3.bin` `ad7bf1923f855fca5949d0c557a2a819b106cd84b204870bcc59064eb0c6e331`	rtf-objdata-decoded	RTF \objdata at offset 0x31FB3	2632 bytes
`objdata_02_off00033556.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x33556	12297 bytes

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