Log4Shell-IOCs

Members of the Curated Intelligence Trust Group have compiled a list of IOC feeds and threat reports focused on the recent Log4Shell exploit targeting CVE-2021-44228 in Log4j

Analyst Comments:

• IOCs shared by these feeds are LOW-TO-MEDIUM CONFIDENCE we strongly recommend NOT adding them to a blocklist
• These could potentially be used for THREAT HUNTING and could be added to a WATCHLIST
• Curated Intel members at various organisations recommend to FOCUS ON POST-EXPLOITATION ACTIVITY by threats leveraging Log4Shell (ex. threat actors, botnets)
• IOCs include JNDI requests (LDAP, but also DNS and RMI), cryptominers, DDoS bots, as well as Meterpreter or Cobalt Strike
• Critical IOCs to monitor also include attacks using DNS-based exfiltration of environment variables (e.g. keys or tokens) - see here

Indicators of Compromise (IOCs)

Source	URL
GreyNoise (1)	https://gist.github.com/gnremy/c546c7911d5f876f263309d7161a7217
Malwar3Ninja's GitHub	https://github.com/Malwar3Ninja/Exploitation-of-Log4j2-CVE-2021-44228/blob/main/Threatview.io-log4j2-IOC-list
Tweetfeed.live by @0xDanielLopez	https://twitter.com/0xdaniellopez/status/1470029308152487940?s=21
Azure Sentinel	https://raw.githubusercontent.com/Azure/Azure-Sentinel/master/Sample%20Data/Feeds/Log4j_IOC_List.csv
URLhaus	https://urlhaus.abuse.ch/browse/tag/log4j/
Malware Bazaar	https://bazaar.abuse.ch/browse/tag/log4j/
ThreatFox	https://threatfox.abuse.ch/browse/tag/log4j/
Cronup	https://github.com/CronUp/Malware-IOCs/blob/main/2021-12-11_Log4Shell_Botnets
RedDrip7	https://github.com/RedDrip7/Log4Shell_CVE-2021-44228_related_attacks_IOCs
AbuseIPDB	Google/Bing Dorks site:abuseipdb.com "log4j", site:abuseipdb.com "log4shell"
CrowdSec	https://gist.github.com/blotus/f87ed46718bfdc634c9081110d243166
Andrew Grealy, CTCI	https://docs.google.com/spreadsheets/d/e/2PACX-1vT1hFu_VlZazvc_xsNvXK2GJbPBCDvhgjfCTbNHJoP6ySFu05sIN09neV73tr-oYm8lo42qI_Y0whNB/pubhtml#
Bad Packets	https://twitter.com/bad_packets/status/1469225135504650240
NCSC-NL	https://github.com/NCSC-NL/log4shell/tree/main/iocs
Costin Raiu, Kaspersky	https://twitter.com/craiu/status/1470341085734051840?s=21
Kaspersky	https://securelist.com/cve-2021-44228-vulnerability-in-apache-log4j-library/105210/
SANS Internet Storm Center	https://isc.sans.edu/diary/Log4Shell+exploited+to+implant+coin+miners/28124
@cyber__sloth	https://twitter.com/cyber__sloth/status/1470353289866850305?s=21
SuperDuckToes	https://gist.github.com/superducktoes/9b742f7b44c71b4a0d19790228ce85d8
Nozomi Networks	https://www.nozominetworks.com/blog/critical-log4shell-apache-log4j-zero-day-attack-analysis/
Miguel Jiménez	https://hominido.medium.com/iocs-para-log4shell-rce-0-day-cve-2021-44228-98019dd06f35

Threat Reports

Source	Threat	URL
@GelosSnake	Kinsing	https://twitter.com/GelosSnake/status/1469341429541576715
@an0n_r0	Kinsing	https://twitter.com/an0n_r0/status/1469420399662350336?s=20
@zom3y3	Muhstik	https://twitter.com/zom3y3/status/1469508032887414784
360 NetLab (1)	Mirai, Muhstik	https://blog.netlab.360.com/threat-alert-log4j-vulnerability-has-been-adopted-by-two-linux-botnets/
MSTIC	Cobalt Strike	https://www.microsoft.com/security/blog/2021/12/11/guidance-for-preventing-detecting-and-hunting-for-cve-2021-44228-log4j-2-exploitation/
Cronup	Kinsing, Katana-Mirai, Tsunami-Mirai	https://twitter.com/1zrr4h/status/1469734728827904002?s=21
Cisco Talos	Kinsing, Mirai	https://blog.talosintelligence.com/2021/12/apache-log4j-rce-vulnerability.html
Profero	Kinsing	https://medium.com/proferosec-osm/log4shell-massive-kinsing-deployment-9aea3cf1612d
CERT.ch	Kinsing, Mirai, Tsunami	https://www.govcert.ch/blog/zero-day-exploit-targeting-popular-java-library-log4j/
IronNet	Mirai, Cobalt Strike	https://www.ironnet.com/blog/log4j-new-software-supply-chain-vulnerability-unfolding-as-this-holidays-cyber-nightmare
@80vul	New Ransomware	https://twitter.com/80vul/status/1470272820571963392
@Laughing_Mantis	Log4j Worm	https://twitter.com/Laughing_Mantis/status/1470168079137067008
Lacework	Kinsing, Mirai	https://www.lacework.com/blog/lacework-labs-identifies-log4j-attackers/
360 NetLab (2)	Muhstik, Mirai, BillGates (Elknot), XMRig, m8220, SitesLoader, Meterpreter	https://blog.netlab.360.com/ten-families-of-malicious-samples-are-spreading-using-the-log4j2-vulnerability-now/
Trend Micro	Cobalt Strike, Kirabash, Swrort, Kinsing, Mirai	https://www.trendmicro.com/en_us/research/21/l/patch-now-apache-log4j-vulnerability-called-log4shell-being-acti.html
BitDefender	Khonsari Ransomware, Orcus RAT, XMRig, Muhstik	https://businessinsights.bitdefender.com/technical-advisory-zero-day-critical-vulnerability-in-log4j2-exploited-in-the-wild

Payload Examples

Source	URL
GreyNoise (2)	https://gist.github.com/nathanqthai/01808c569903f41a52e7e7b575caa890
Cloudflare	https://blog.cloudflare.com/actual-cve-2021-44228-payloads-captured-in-the-wild/
yt0ng	https://gist.github.com/yt0ng/8a87f4328c8c6cde327406ef11e68726
eromang	https://github.com/eromang/researches/tree/main/CVE-2021-44228
VX-Underground	https://samples.vx-underground.org/samples/Families/Log4J%20Malware/