RTF malware analysis — malicious · d167a3ad7e35bbf9

MALICIOUS

RTF

327.8 KB First seen: 2021-07-07

MD5: 398db46009fddba421ccbd3a3f7f1f64 SHA-1: e8fa0d9e0f4bf8e0f056582f17a408e1e25b7107 SHA-256: d167a3ad7e35bbf9bda52b07eff3eb4905ee13f37f06f4f6c064c56804183606

280 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of malicious OLE object embedding and automatic linking, specifically related to CVE-2017-8570. The document body explicitly instructs the user to 'download the document and click Enable Editing', which is a common lure to bypass security measures. The presence of shellcode command strings and extracted artifacts like 'objdata_01_off00007114.bin' suggests that the file is designed to execute a secondary payload.

Heuristics 8

Composite Moniker — CVE-2017-8570 (drops SCT script) critical CVE related CVE_2017_8570

RTF \objdata decodes to OLE data containing the Composite Moniker — CVE-2017-8570 (drops SCT script) CLSID — the vulnerable control/moniker is embedded directly in the document's object stream, the delivery shape of this exploit. RTF objects auto-render when Word opens the file.
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.
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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.
Suspicious extracted artifact high 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.
OLE object data medium RTF_OBJDATA

RTF contains 4 \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

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000965.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x965	56425 bytes
SHA-256: `c8f3f677a7f0bd722d44970f5eec3e5140195110118e4b9d14259bee8f28cdd6`
`objdata_01_off00007114.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x7114	56398 bytes
SHA-256: `00ca2734b5fcdc193a82d4e919276c15b045f13e47661c61d6db082847f2ea02`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell"")")
`objdata_02_off00023bf1.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x23BF1	2632 bytes
SHA-256: `a8e170497da15decc11753d202c99c86f7a7ffd2d52481e6b9c79a5403675379`
`objdata_03_off00025194.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x25194	12297 bytes
SHA-256: `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`

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