RTF malware analysis — malicious · 41ee5400133d5ab0

MALICIOUS

RTF

217.4 KB First seen: 2022-04-11

MD5: aa03f25e1c754bd1e277c1e26d67485a SHA-1: 8941c589db2dd91cf34fd3593d83bfae5f6aefc5 SHA-256: 41ee5400133d5ab045d53694480e9db23f80a45e199c237f7d31059f356e689c

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file 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_off000007d2.bin, is flagged as a suspicious extracted artifact with signals for script execution. This indicates the file is designed to drop and execute a malicious payload, likely 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_off000007d2.bin` `655406f6a753ff6309f3bb60d8cfc45556cec16ede55dda52a0eae19b4f39a12`	rtf-objdata-decoded	RTF \objdata at offset 0x7D2	15635 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00008778.bin` `64b1f15a0e9494bf93ea2a1e9ea1b7d807d3f377db217eed0f95ae662942e168`	rtf-objdata-decoded	RTF \objdata at offset 0x8778	2632 bytes
`objdata_02_off00009d1b.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x9D1B	12297 bytes

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