MALICIOUS — api-ms-win-core-fibers-l1-1-1.dll
MALICIOUS — api-ms-win-core-fibers-l1-1-1.dll is a pe sample analyzed by MalwareAnalyzer by Cyble with a malicious verdict (98/100), attributed to the Container family. 9 of 55 detection engines flagged it, exhibiting 1 ATT&CK technique.
Identification
- SHA-256:
037b0ba594058986ff84f40436acf1aa5f692daa64295d9022cf7c531298280c - SHA-1:
7aa03bb11083d8e39d9303defc70850b11f4729e - MD5:
c0946863b74057fc5ae31de4945563b9 - imphash:
38aa7c2ff6ef0e48a9520d6702d08df4 - ssdeep:
6144:TeEriRsAxH/K2jye9POln4RUOeinwl5gaO5W2cRFWx5G3TX:igixH/dpPOV4uOeinggFQF45k - TLSH:
T1FB4BAFB1021A1135D9FABEB0A01CCE7CD063784970786F5E9187DB5D9098AE3E8FE491 - Submitted as: api-ms-win-core-fibers-l1-1-1.dll
- File type: pe · Size: 483722 bytes
- Verdict: malicious (98/100) · Family: Container
Detections (9 of 55 engines)
- MalwareAnalyser heuristics (entropy/packer): UPX
- ClamAV (daily): Win.Trojan.Agent-6943819-1
- YARA: delivr.to detections: DLV_ISO_IMG_Container_Lure
- YARA: JPCERT/CC: JPCERT_HUILoader_PlugX_SideLoad
- Detect It Easy (packer/type): DIE:UPX
- Microsoft Defender: Virus:Win32/Sivis.A
- Emsisoft (Emergency Kit): Win32.Sivis.A
- Trellix Stinger (McAfee): PolyPatch-UPX
- Kaspersky (KVRT): Virus.Win32.Agent.es
MITRE ATT&CK
Why this verdict
The malicious score of 98/100 is the fusion of 10 weighted signals:
- ClamAV (daily) flagged Win.Trojan.Agent-6943819-1 (rule
Win.Trojan.Agent-6943819-1) - engine signal, weight 0.90, confidence 0.95 - Contacted 24 external host(s) at runtime (20 HTTP) - network signal, weight 0.40, confidence 0.80
- Anti-analysis: T1497 - dynamic signal, weight 0.40, confidence 0.75
- YARA: delivr.to detections flagged DLV_ISO_IMG_Container_Lure (rule
DLV_ISO_IMG_Container_Lure) - engine signal, weight 0.35, confidence 0.70 - YARA: JPCERT/CC flagged JPCERT_HUILoader_PlugX_SideLoad (rule
JPCERT_HUILoader_PlugX_SideLoad) - engine signal, weight 0.35, confidence 0.70 - Detect It Easy (packer/type) flagged DIE:UPX (rule
DIE:UPX) - engine signal, weight 0.35, confidence 0.70 - Embedded network infrastructure: http://creativecommons.org/publicdomain/zero/1.0/, https://d.symcb.com/rpa0, http://s.symcb.com/universal-root.crl0 - static signal, weight 0.35, confidence 0.60
- Packing/obfuscation: UPX - static signal, weight 0.25, confidence 0.55
- Dropped 83 executable file(s) at runtime - dynamic signal, weight 0.20, confidence 0.60
- Extracted generic config (1 C2) (generic/advisory) - engine signal, weight 0.15, confidence 0.30
Dynamic analysis (windows)
25428 behavior events · 0 ATT&CK techniques · 97 dropped files.
Runtime network
- www.msftconnecttest.com
- rb.symcd.com
- rb.symcb.com
- inference.location.live.net
- to-do.office.com
- staging.to-do.officeppe.com
- teams.cloud.microsoft
- outlook.office.com
- outlook.office365.com
- outlook.cloud.microsoft
- ctldl.windowsupdate.com
- login.live.com
- ocsp.digicert.com
- desktop-hsgcbep
- v20.events.data.microsoft.com
- config.edge.skype.com
- licensing.mp.microsoft.com
- windows.msn.com
- oneocsp.microsoft.com
- www.msn.com
Dropped files
- C:\Program Files\Eclipse Adoptium\jdk-21.0.5+11-jre\bin\api-ms-win-crt-heap-l1-1-0.dll -
5990cd6595e245afa1918ee843d58dcb862ce68deaa75123218066249b7a60f9 - C:\Program Files\Eclipse Adoptium\jdk-21.0.5+11-jre\bin\api-ms-win-crt-process-l1-1-0.dll -
fa0dd23539106c08b5366c0e2eaf9bc2e920efed55e3e7920189bf27c9b854d4 - C:\Program Files\Eclipse Adoptium\jdk-21.0.5+11-jre\bin\mlib_image.dll -
4a132ba2a697efc1830dcbcdd09a95c1656b4fc08fc8e9750633f0487eb93871 - C:\Program Files\Eclipse Adoptium\jdk-21.0.5+11-jre\bin\api-ms-win-core-fibers-l1-1-1.dll -
8c68e036d26d4a4f8c4fc4acac60dc7721ad56b7b1b78eff0c298b348fc7cea6 - C:\Program Files\Eclipse Adoptium\jdk-21.0.5+11-jre\bin\management.dll -
a957fb1c5b96a6eb9c45d18497939d6bd80888a06327cda9c10ea01e8475da01 - C:\Program Files\Eclipse Adoptium\jdk-21.0.5+11-jre\bin\api-ms-win-crt-convert-l1-1-0.dll -
e3c7ef42ae5ef7798aea4a37cd1e471e0ffad5700b68d4007f6570fcf2c58145 - C:\Program Files\Eclipse Adoptium\jdk-21.0.5+11-jre\bin\api-ms-win-core-synch-l1-1-0.dll -
2663b86551d6f391898fd7c668cf9a2687dff2e95d2ae2141ffa63b7d2284a4f - C:\Program Files\Eclipse Adoptium\jdk-21.0.5+11-jre\bin\keytool.exe -
1fcb73af8f351b1efcc054d1ad05dbfc9b84a91de91352edf971b34f68ce6e5f - C:\Program Files\Eclipse Adoptium\jdk-21.0.5+11-jre\bin\api-ms-win-core-errorhandling-l1-1-0.dll -
8b6ff35e2bd27e7d85ca34eaac7eb70fd71425408281b8241f5fb971c6f1e30a - C:\Program Files\Eclipse Adoptium\jdk-21.0.5+11-jre\bin\fontmanager.dll -
727b1e54fd488dc034c6bab7124b6e07064f09db2038bbfc461ee2d044ceee92 - C:\Program Files\Eclipse Adoptium\jdk-21.0.5+11-jre\bin\api-ms-win-core-memory-l1-1-0.dll -
9387006ce352d50a38797b226b0a0a860bde85d275ff5dae336e522b3d3f6772 - C:\$WinREAgent\Backup\ReAgent.xml -
dbf5cc342eef710092fc72b23ebc4a30916e5f30127da63aeb9573fd55645c88 - C:\Program Files\Eclipse Adoptium\jdk-21.0.5+11-jre\bin\api-ms-win-core-file-l1-1-0.dll -
a3a6646a427c08d0766c5b3b4a6e8acd458211b487ee674ac017820640b76768 - C:\Program Files\Eclipse Adoptium\jdk-21.0.5+11-jre\bin\api-ms-win-core-datetime-l1-1-0.dll -
03140a6914d285822bf1cff8296a70b470343ab65903b760e412a890b971b610 - C:\Program Files\Eclipse Adoptium\jdk-21.0.5+11-jre\bin\api-ms-win-core-debug-l1-1-0.dll -
c56d5e9238d9db11bf9a26342b719827b879abab9accab654ebbd6ddfaa82568
Embedded URLs
- http://creativecommons.org/publicdomain/zero/1.0/
- http://www.adobe.com/go/reader_system_reqs_it.UnmoveFilesRimozione
- http://www.adobe.com/go/reader_system_reqs_it
- https://www.digicert.com/CPS0
- http://cacerts.digicert.com/DigiCertEVCodeSigningCA-SHA2.crt0
- http://cacerts.digicert.com/DigiCertHighAssuranceEVRootCA.crt0
- http://crl3.digicert.com/DigiCertHighAssuranceEVRootCA.crl0@
- http://crl4.digicert.com/DigiCertHighAssuranceEVRootCA.crl0
- http://www.digicert.com/ssl-cps-repository.htm0
- https://d.symcb.com/rpa0
- http://s.symcb.com/universal-root.crl0
- https://d.symcb.com/rpa0@
- http://ts-crl.ws.symantec.com/sha256-tss-ca.crl0
- http://ts-aia.ws.symantec.com/sha256-tss-ca.cer0
- http://www.microsoft.com/pki/certs/MicCodSigPCA_2010-07-06.crt0
- http://www.microsoft.com/pki/certs/MicRooCerAut_2010-06-23.crt0
- http://www.microsoft.com/windows0
- http://www.digicert.com/CPS0
- http://www.eclipse.org/0
- http://www.msftconnecttest.com/connecttest.txt
- http://rb.symcd.com/MFEwTzBNMEswSTAJBgUrDgMCGgUABBTDRSYViRCZTxmZjLENmnwVjLly9QQU1MAGIknrOUvdk%2BJcobhHdglyA1gCEF0QyxjrOnkAh4OrdHf50xk%3D
- http://rb.symcb.com/rb.crl
- http://203.26.79.13/filestreamingservice//files/753bb2df-a166-494f-aa7d-5678b1ef0c56/pieceshash?cacheHostOrigin=dl.delivery.mp.microsoft.com
- http://203.26.79.13/filestreamingservice/files/753bb2df-a166-494f-aa7d-5678b1ef0c56?P1=1787726777&P2=404&P3=2&P4=JrCeWIPY9dJreK%2f%2fxzowY51yIdRK%2fmsWp4xZrijNYWVbfRx0EVvkJbLGgDdsW1EfoZa8%2f5fOrSC39zxA1WRqUQ%3d%3d&cacheHostOrigin=msedge.b.tlu.dl.delivery.mp.microsoft.com
- http://203.26.79.13/filestreamingservice//files/c74a5353-3e6a-42b7-94d6-9b96c560c89a/pieceshash?cacheHostOrigin=dl.delivery.mp.microsoft.com
Embedded domains
- creativecommons.org
- geocities.com
- www.adobe.com
- helpx.adobe.com
- www.microsoft.com
- crl3.digicert.com
- crl4.digicert.com
- www.digicert.com
- cacerts.digicert.com
- d.symcb.com
- s.symcb.com
- ts-crl.ws.symantec.com
- ts-aia.ws.symantec.com
- crl.microsoft.com
- www.eclipse.org
Embedded IP addresses
- 142.250.183.35
- 20.184.175.21
- 52.253.84.76
- 85.210.196.11
- 4.230.171.124
- 40.79.163.154
- 74.178.240.61
- 74.178.240.51
- 20.236.44.162
- 52.123.129.14
- 4.150.223.98
- 40.84.85.40
- 203.26.79.13
- 135.233.45.221
- 172.192.81.105
- 52.123.252.204
- 135.233.95.80
- 52.123.252.246
- 52.148.114.188
- 52.123.252.193
- 72.153.5.128
- 135.232.92.34
- 52.110.12.46
- 52.110.12.8
More Container samples · Latest analyzed threats · ATT&CK coverage
Analyzed on MalwareAnalyzer by Cyble · Open interactive report