RTF / .DOC malware analysis — malicious · 2d237e43a52c24d4

MALICIOUS

RTF / .DOC

235.8 KB First seen: 2022-06-08

MD5: e06c869808e471cb079465e8209fd3fb SHA-1: 1da52093905fba6a261730a2bd714d1357a35d08 SHA-256: 2d237e43a52c24d4099491cb71ecd0c8941a94d5484bf3f4bdb16e495b7bb52e

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The RTF document contains multiple OLE objects, with specific heuristics indicating the use of ".objupdate" and composite monikers, which are commonly used to bypass security measures and execute embedded code. The document body explicitly prompts the user to 'Enable Editing', a typical lure for macro-based malware delivery. While no scripts were directly extracted, the OLE object structure and the lure suggest the embedded objects are intended to download and execute a secondary payload.

Heuristics 6

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
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
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_off00000ba4.bin` `f36cebd63594000acbd3aced680b5fd35f838bf52d381865c47d30b7e91fe172`	rtf-objdata-decoded	RTF \objdata at offset 0xBA4	24247 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000d144.bin` `dd004dba58b2c656e3d355d24a17308be9b6544ee8ace220ec7787c93dcaad64`	rtf-objdata-decoded	RTF \objdata at offset 0xD144	2632 bytes
`objdata_02_off0000e6e7.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0xE6E7	12297 bytes

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