RTF malware analysis — malicious · 2f8141c3517394df

MALICIOUS

RTF

873.1 KB Created: 2017-08-08 13:19:00 First seen: 2017-08-27

MD5: 369da79c5fa049b6ccc951bf3c1ab051 SHA-1: 90fe0203699c9e871cf14898b6888dd953bb1064 SHA-256: 2f8141c3517394dfd818bd9ae762332a9454c8ae12b815de7eb73851a47d9b83

242 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple embedded OLE objects and uses \objupdate to force activation, indicating an attempt to exploit vulnerabilities. Specifically, the CVE-2017-8759 heuristic firing points to exploitation of MSXML SAX OLE activation. The embedded URL 'http://jasadoa.co.id/1111111111111tesla.exe' is highly suspicious and likely serves as a download location for a secondary payload, consistent with dropper malware.

Heuristics 7

CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759

RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
ClamAV: Doc.Dropper.Agent-6940932-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Agent-6940932-0
\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 10 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://jasadoa.co.id/1111111111111tesla.exe In RTF body
- http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00002a35.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2A35	30254 bytes
SHA-256: `abe68635be885fce8f0c11e6a3680ac66693fd3803dd7e05b694ebb0fe439c67`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_01_off00016e65.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x16E65	30254 bytes
SHA-256: `1870bfa0f7f4eb4de8346a460876684c4ca5ea1f28c9b65cdb39185fce0448d4`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_02_off0002b295.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2B295	38446 bytes
SHA-256: `648549447e371923fedddf69d65ecdc8f17b2e37bd580ab4fd50dafe8eb0e88f`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_03_off00043747.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x43747	30254 bytes
SHA-256: `f747059e171dc96d63f5e493e12b1a24015c98de3968ff633d2ade05d9b42f36`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_04_off00057b77.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x57B77	30254 bytes
SHA-256: `5b14d6940ae1550e410e075049a730b62acb7013812b34bad60d230485b79315`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_05_off0006bfa7.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x6BFA7	30254 bytes
SHA-256: `6fb21db97c1005ccb2e2594f82f1144b8ec84b46ef7490b6e2c7743413727eb3`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_06_off000803d7.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x803D7	30254 bytes
SHA-256: `89fdcae8915d0a8792daf77af0ecdf67b19a0187058bdea46cd86078f5ca4ee0`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_07_off00094807.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x94807	30254 bytes
SHA-256: `e76c1aa51a108608f3817e0ce9cfe8838e6d028f5c3ccd9bf7212098c2786aa4`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_08_off000a8c37.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xA8C37	38446 bytes
SHA-256: `429513d81bfcbfa0a3deac858b0c7c241177c702f39667a4e73f3b490a7fbb22`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_09_off000c10e9.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xC10E9	30254 bytes
SHA-256: `b5ea15116d1c78e7a351699fcff4321c806a8312ad679742417ec7d643df40ae`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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