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BumbleBee Roasts Its Way to Domain Admin

➡️Initial Access: BumbleBee (zipped ISO /w LNK+DLL)
➡️Persistence: AnyDesk
➡️Discovery: VulnRecon, Seatbelt, AdFind, etc.
➡️Credentials: Kerberoast, comsvcs.dll, ProcDump
➡️C2: BumbleBee, CobaltStrike, AnyDesk…
Analysis and reporting completed by @Tornado and @MetallicHack

Shout outs: @threatinsight, Google's Threat Analysis Group, @vladhiewsha, @benoitsevens, @DidierStevens, @malpedia, @k3dg3, @malware_traffic, @Unit42_Intel, @EricRZimmerman, & @svch0st. Thanks ya'll!




CS Payload Hosting
Read 6 tweets
If you utilise API hashing in your #malware or offensive security tooling. Try rotating your API hashes. This can have a significant impact on #detection rates and improve your chances of remaining undetected by AV/EDR. See below for an example with a Bind Shell vs #Virustotal.
Since API hashing can be confusing, most attackers won't rotate their hashes with each iteration of malware. Those same hashes can be a reliable detection mechanism if you can recognize them in code.
Luckily finding these hashes isn't too difficult, just look for random hex values prior to a "call rbp".
If you're unsure whether the value is an API hash, just google it and see if you get any hits. Most of the time, identification can be a simple google search away.
Read 6 tweets
Righto. Lets talk about this data and how to use it. To start, I'm uploading a zip file of all samples as well to allow downloading in bulk. I'll also share out some more parts of this as we go. So, off we go...

For background, #CobaltStrike is an "adversary simulation tool" (pentesting tools vs malware sometimes are only philosophically different #FightMe). It is widely used for legitimate security testing, pre-ransomware operations and other malicious threat actors.

The files provide are called Beacon. It's the malware deployed and controlled by CobaltStrike. While the two names are commonly misused interchangeably (even by myself). @Mandiant did a solid write-up on names.…

Read 14 tweets
Here's a thread on some of the interesting things we've seen in the #ContiLeaks.

If you would like to read the chat logs and TrickBot Forum information, @Kostastsale has translated them to English here:…. He will be adding more as things get leaked.
New chat logs from the 26 Feb to the 28 Feb were released. It included an entertaining exchange where the user "pumba" was not happy with their work partner "tramp" (also referred to as “trump”). “Pumba” ends the conversation by asking to be moved to another team. #ContiLeaks Image
Leaked Bazar Bot panels show hundreds of past infected clients. Entries contain comments that include reconnaissance of revenue, and tracking work to be done. #ContiLeaks ImageImageImageImage
Read 78 tweets
Today i've published my first blog with @sophos 🥳

"Zloader Installs Remote Access Backdoors and Delivers Cobalt Strike"


(🧵Thread with details)
This attack campaign was recently researched by @_CPResearch_ and @sysopfb



Given our observations regarding initial access and the CobaltStrike beacon deployed, we wanted to publish our corresponding research.
On a Friday afternoon in December a user google searched for "teamviewer download"

Unfortunately they clicked on a malvertising result that directed them to the C2 domain teamviewer-u[.]com

The user downloaded and ran #Zloader malware named 'TeamViewer.msi'
Read 11 tweets
This content looks VERY familiar...

1. "Initial Actions"
2. rclone config using Mega
3. rclone instructions
4.Powerview/UserHunter instructions

Thanks @vxunderground!!
1. NTDS dumping
2. Kerberoasting
3. Netscan (Thanks Perry)
4. Ping script
1. Dump LSASS via #CobaltStrike, RDP, Mimikatz
2. AnyDesk install/exec
3. Scheduled task and wmic exec
4. AdFind! The same script we've been seeing since 2019
Read 9 tweets
Here's some newer #CobaltStrike servers we're tracking:




Full list available @
Here's some newer #CobaltStrike servers we're tracking:




Full list available @
Here's some newer #CobaltStrike servers we're tracking:




Full list available @
Read 4 tweets
ICYMI, @PwC_UK’s 2020 #threatintel Year in Retrospect report is out now! All team contributed but h/t to @KystleM_Reid! :fire: You can check it out here: In this thread, I will summarise some of what I thought were key findings: 🧵👇 1/n
#Ransomware has become the most significant cyber security threat faced by organisations, irrespective of industry/location. TTPs have pivoted to mass data exfiltration prior to encryption, along with leaks & extortion. S/o to @andyp346 for all your work countering this.🙏 2/n
In 2020, 86% of the incidents that PwC’s Incident Response team responded to were attributable to cyber criminals. 79% of leaks happened in 2nd half of 2020. Our data sees Manufacturing, TMT, & Professional Services most impacted. 3/n
Read 19 tweets
As part of our commitment to keeping our customers/community protected & informed, we are releasing a blog that shines light on transition between Stage 1 and 2 of #Solorigate/#SUNBURST campaign, custom Cobalt Strike loaders, post-exploit. artifacts, IOCs:…
Here are some highlights:
The missing link between the Solorigate backdoor and the custom #CobaltStrike loaders observed during the #Solorigate is an Image File Execution Options (IFEO) Debugger registry value created for the legitimate process dllhost.exe (ATT&CK ID: T1546.012).
Once the registry value is created, the attackers wait for the occasional execution of dllhost.exe, which might happen naturally on a system. This execution triggers a process launch of wscript.exe configured to run the VBScript file dropped by the SolarWinds backdoor (Stage 1).
Read 21 tweets
Facebook’s @ngleicher was right about linking #APT32 to CyberOne and here is why:
As per Group-IB #ThreatIntelligence & #Attribution the domain cbo[.]group had an IP 45[.]61[.]136[.]214 in the A-record. On this IP address, we detected a unique SSH 4b390f0b7125c0d01fe938eb57d24051 Image
According to Group-IB Graph Network Analysis, this fingerprint was also seen on 30 other hosts including on 45[.]61[.]136[.]166 and 45[.]61[.]136[.]65. Both were used to deploy a uniquely configured #CobaltStrike framework, used exclusively by #APT32 aka #OceanLotus Image
All the listed IPs belong to the autonomous network - AS53667 within the range of 45.61[.]128[.]0 to 45[.]61[.]191[.]255. We've also seen #APT32 hosting #CobaltStrike on the 45[.]61[.]139[.]211, which was indicated in the A-record of feeder[.]blogdns[.]com
Read 3 tweets

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