added detect-cyzfc-activity.md

Author: martyav

Campaigns/detect-cyzfc-activity.md

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+# Detect activity associated with malicious DLL, cyzfc.dat
+
+These queries was originally published in the threat analytics report, *Attacks on gov't, think tanks, NGOs*.
+
+As described further in *[Analysis of cyberattack on U.S. think tanks, non-profits, public sector by unidentified attackers](https://www.microsoft.com/security/blog/2018/12/03/analysis-of-cyberattack-on-u-s-think-tanks-non-profits-public-sector-by-unidentified-attackers/)*, there was a very large spear-phishing campaign launched in November 2019.
+
+The attackers would gain access to a target by having the user click on a link to a compromised website and download a .zip archive.
+
+Once established on a target's device, the attackers used a malicious DLL named *cyzfc.dat* to execute additional payloads. They would call a function in the malicious DLL via the legitimate Windows process, [rundll32.exe](https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/rundll32), to connect directly to their command-and-control (C2) servers.
+
+The following queries detect activity associated with the malicious DLL, *cyzfc.dat.*, used in this campaign.
+
+## Query
+
+```Kusto
+​// Query 1: Events involving the DLL container
+let fileHash = "9858d5cb2a6614be3c48e33911bf9f7978b441bf";
+find in (FileCreationEvents, ProcessCreationEvents, MiscEvents,
+RegistryEvents, NetworkCommunicationEvents, ImageLoadEvents)
+where SHA1 == fileHash or InitiatingProcessSHA1 == fileHash
+| where EventTime > ago(10d)
+// Query 2: C2 connection
+NetworkCommunicationEvents
+| where EventTime > ago(10d)
+| where RemoteUrl == "pandorasong.com"
+// Query 3: Malicious PowerShell
+ProcessCreationEvents
+| where EventTime > ago(10d)
+| where ProcessCommandLine contains
+"-noni -ep bypass $zk='JHB0Z3Q9MHgwMDA1ZTJiZTskdmNxPTB4MDAwNjIzYjY7JHRiPSJ"
+// Query 4: Malicious domain in default browser commandline
+ProcessCreationEvents
+| where EventTime > ago(10d)
+| where ProcessCommandLine contains
+"https://www.jmj.com/personal/nauerthn_state_gov"
+// Query 5: Events involving the ZIP
+let fileHash = "cd92f19d3ad4ec50f6d19652af010fe07dca55e1";
+find in (FileCreationEvents, ProcessCreationEvents, MiscEvents,
+RegistryEvents, NetworkCommunicationEvents, ImageLoadEvents)
+where SHA1 == fileHash or InitiatingProcessSHA1 == fileHash
+| where EventTime > ago(10d
+```
+
+## Category
+
+This query can be used to detect the following attack techniques and tactics ([see MITRE ATT&CK framework](https://attack.mitre.org/)) or security configuration states.
+
+| Technique, tactic, or state | Covered? (v=yes) | Notes |
+|-|-|-|
+| Initial access |  |  |
+| Execution | v |  |
+| Persistence |  |  |
+| Privilege escalation |  |  |
+| Defense evasion |  |  |
+| Credential Access |  |  |
+| Discovery |  |  |
+| Lateral movement |  |  |
+| Collection |  |  |
+| Command and control |  |  |
+| Exfiltration |  |  |
+| Impact |  |  |
+| Vulnerability |  |  |
+| Misconfiguration |  |  |
+| Malware, component |  |  |
+
+## Contributor info
+
+**Contributor:** Microsoft Threat Protection team