RTF malware analysis — malicious · f982fb8ef63466c1

MALICIOUS

RTF

767.7 KB Created: 2017-08-17 16:35:00 First seen: 2017-10-10

MD5: 4a1b505ec13d51b804a24ac333d5a139 SHA-1: cf3325e99f029b891ecd91a091379207542ae65e SHA-256: f982fb8ef63466c16cdc5c8d107770f986e4b28c476edf5d848a600e2f4320fa

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF file contains multiple embedded OLE objects, with heuristics indicating that \objupdate forces OLE activation. One of the extracted URLs, http://a.pomf.cat/adlwjt.exe, is suspicious and likely points to a malicious executable. The embedded objects are likely used to deliver and execute this payload, suggesting a spearphishing attachment attack vector.

Heuristics 5

\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://a.pomf.cat/adlwjt.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_off000028f4.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x28F4	32302 bytes
SHA-256: `58b8842392244e8871552005d490e7cb0365a01e647fb2a370773d83f1ae55bd`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_01_off00015007.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x15007	32302 bytes
SHA-256: `0bd3bc39ba0c6c4f42f8c05d485ab183acaa2c4cf636bf7913695ec49d70f872`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_02_off0002771a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2771A	32302 bytes
SHA-256: `2d11b4770afa2bcc5e1953dce2a8e1c48016acbe3ebed79b4481bba2a28608ee`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_03_off00039e2d.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x39E2D	32302 bytes
SHA-256: `f81a3fc8c8fe2529e2c7683b57e1f7b278fe2b231d1cd5e3d73abc119fb833dc`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_04_off0004c540.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x4C540	32302 bytes
SHA-256: `3134b338c4143122f3e3488316388899c16340fb9edea827624299199993075a`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_05_off0005ec53.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x5EC53	32302 bytes
SHA-256: `b8e72280148fe785b594b336ec9e0202fc17e35f148e7f113867ecb0fdbf1d84`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_06_off00071366.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x71366	32302 bytes
SHA-256: `3cb2851e7225de5d121347f80b004f6ebb7f689ba7b70b6b5389d5054830375c`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_07_off00083a79.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x83A79	32302 bytes
SHA-256: `c50f6389b94f655b9e75c328bdb96b74cabe0160f6e32891e50c8987b55aeb38`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_08_off0009618c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x9618C	32302 bytes
SHA-256: `ae09d6db92f34546e2b9d6f1667be26877f37e4fcf731e6d33bf8a0c8fe15a10`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_09_off000a889f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xA889F	32302 bytes
SHA-256: `2ad90fb50d1ca8d1002445a2ab0776af6583a72a11205ccc1aab6eab2a2beba2`
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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