RTF malware analysis — malicious · 4b9a0e133472e7ca

MALICIOUS

RTF

2.57 MB Created: 2018-02-04 22:31:00 First seen: 2018-02-19

MD5: f073328b984dc8ac06b23af413ad2afb SHA-1: a1a5aaf0eb929092c1fa4c5150005c274485ccea SHA-256: 4b9a0e133472e7caeeec448bb692d4e29e555c1d4856ebf4eb9913fb132c9c1d

282 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is an RTF document that contains multiple OLE objects, with evidence of OLE activation via \objupdate. Critical heuristics indicate exploitation of CVE-2017-8759, a known vulnerability for client execution. The embedded URL points to a VBScript file, suggesting the document's purpose is to download and execute this script.

Heuristics 8

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.Macro.Obfuscation-6391394-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Macro.Obfuscation-6391394-0
\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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1079KB of hex-encoded data inside \objdata sections — may hide a payload
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://fast-cargo.com/images/file/vb/22.vbs\\ 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_off00002c17.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2C17	67630 bytes
SHA-256: `574a70d9f3259eac3bde3295f701b57b12a6077c55fa24d98d34e095f1c0a27f`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_01_off00029ace.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x29ACE	67630 bytes
SHA-256: `00b4ed2ee7f9f9d32a919a9a1703b532ce7be9ae35773af520e6863c63b14de9`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_02_off000508fc.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x508FC	67630 bytes
SHA-256: `c84f8f6ec5e7d744dcebcaf94cd96d0ae0f42c4386a35fb6b0936bdeae5ab0d4`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_03_off0007772a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x7772A	67630 bytes
SHA-256: `0ad283d2911e637762b90c51b317e06973fa3a627c37312a81f1c4c5dfae5171`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_04_off0009e5a6.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x9E5A6	67630 bytes
SHA-256: `681a56bf54eb0f94b9cef2c50c604b263d8c0e73d6a70fa893605542b8725bae`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_05_off000c53d4.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xC53D4	67630 bytes
SHA-256: `00b52948fecaef4526ac58013b3f4dbfd27b1bdef528c64fe3c7eca26542c79a`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_06_off000ec202.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xEC202	67630 bytes
SHA-256: `6bb5ce25aa48caa72ed6452d70c009708ba6439edbe9296098c10b24fa3b1863`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_07_off00113030.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x113030	67630 bytes
SHA-256: `b501ed1aaa1918ea52b353363081037b71f8375a41c3afb88c2d3931f22d2b6a`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_08_off00139e5e.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x139E5E	67630 bytes
SHA-256: `608a717eb17d3461620afd78a83737458e1cbcac74b95d3863a1a0da573f0be4`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_09_off00160c93.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x160C93	67630 bytes
SHA-256: `733814dc13088acf6f8c763d8c97d72746a1486a330edfc5288cf52fa47b27b3`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell Carved macro source contains an auto-exec entry point and execution/download terms.

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