MALICIOUS — 8c85757c72aaff2ca589e0025b71f18f8042411f7b80eb6015431777bee8b93f
MALICIOUS — 8c85757c72aaff2ca589e0025b71f18f8042411f7b80eb6015431777bee8b93f is a pe sample analyzed by MalwareAnalyzer by Cyble with a malicious verdict (100/100), attributed to the FlyAgent family. 11 of 55 detection engines flagged it, exhibiting 7 ATT&CK techniques.
Identification
- SHA-256:
8c85757c72aaff2ca589e0025b71f18f8042411f7b80eb6015431777bee8b93f - SHA-1:
7b08be4415cbe84a56e73a1623cb65b0c7d48f91 - MD5:
a40b19d86312f595f68fd1fb7c54d7a0 - imphash:
7700dc8e87e8a6c0c69971842b4b7691 - ssdeep:
24576:zkEq6Xru36vHi3ubATxjr/AL9d81HuDL/Y7LmtYpD6BaVo2ax:lm3oy/68Vun/5sXo2ax - TLSH:
T10F54AEDB3B0BA847DD343A960D11567DC032BBB346BA1DE5B6A6E32463D28034D33991 - Submitted as: 8c85757c72aaff2ca589e0025b71f18f8042411f7b80eb6015431777bee8b93f
- File type: pe · Size: 1176900 bytes
- Verdict: malicious (100/100) · Family: FlyAgent
Detections (11 of 55 engines)
- capa (capabilities): capability:collection/keylog
- MalwareAnalyser heuristics (entropy/packer): high-entropy-sections:.text
- ClamAV (daily): Win.Malware.FlyAgent-9850229-1
- YARA: delivr.to detections: DLV_Maldoc_VBA_AutoExec
- YARA: JPCERT/CC: JPCERT_HUILoader_PlugX_SideLoad
- YARA: Stratosphere IPS: STRATO_Malicious_UserAgent
- YARA: MalwareAnalyser community pack: TL_Windows_Persistence_RunKey
- Microsoft Defender: Trojan:Win32/FlyAgent!pz
- Emsisoft (Emergency Kit): GenPack:Generic.Dacic.4803.19E0780E
- Trellix Stinger (McAfee): Flyagent.d
- Kaspersky (KVRT): UDS:Trojan.Win32.Agent
MITRE ATT&CK
Why this verdict
The malicious score of 100/100 is the fusion of 18 weighted signals:
- ClamAV (daily) flagged Win.Malware.FlyAgent-9850229-1 (rule
Win.Malware.FlyAgent-9850229-1) - engine signal, weight 0.90, confidence 0.95 - Memory forensics: 2 finding(s), e.g. SSDT hook (rule
windows.ssdt.SSDT) - memory signal, weight 0.50, confidence 0.85 - Observed at runtime: Windows Service (T1543.003) (rule
Windows Service) - dynamic signal, weight 0.40, confidence 0.90 - 1 behavioral detection(s): Windows Service Installation [medium] (rule
tl-service-install) - dynamic signal, weight 0.40, confidence 0.90 - capture keystrokes (rule
capture keystrokes) - capa signal, weight 0.40, confidence 0.80 - Contacted 28 external host(s) at runtime (21 HTTP) - network signal, weight 0.40, confidence 0.80
- Anti-analysis: T1497.001, T1082, T1622 - dynamic signal, weight 0.40, confidence 0.75
- YARA: delivr.to detections flagged DLV_Maldoc_VBA_AutoExec (rule
DLV_Maldoc_VBA_AutoExec) - 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 - YARA: Stratosphere IPS flagged STRATO_Malicious_UserAgent (rule
STRATO_Malicious_UserAgent) - engine signal, weight 0.35, confidence 0.70 - YARA: MalwareAnalyser community pack flagged TL_Windows_Persistence_RunKey (rule
TL_Windows_Persistence_RunKey) - engine signal, weight 0.35, confidence 0.70 - persist via registry run key (rule
persist via registry run key) - capa signal, weight 0.35, confidence 0.60 - Embedded network infrastructure: http://sf.symcb.com/sf.crl0a, https://d.symcb.com/rpa0, http://sf.symcb.com/sf.crt0 - static signal, weight 0.35, confidence 0.60
- communicate over HTTP (rule
communicate over HTTP) - capa signal, weight 0.30, confidence 0.60 - Packing/obfuscation: high-entropy-sections:.text - static signal, weight 0.25, confidence 0.55
- enumerate processes (rule
enumerate processes) - capa signal, weight 0.20, confidence 0.60 - Dropped 2 executable file(s) at runtime - dynamic signal, weight 0.20, confidence 0.60
- Observed at runtime: Modify Registry (T1112) (rule
Modify Registry) - dynamic signal, weight 0.12, confidence 0.90
Dynamic analysis (windows)
33627 behavior events · 2 ATT&CK techniques · 2 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
- windows.msn.com
- settings-win.data.microsoft.com
- oneocsp.microsoft.com
- www.msn.com
Dropped files
- C:\Users\analyst\AppData\Roaming\Microsoft\VBS3.vbs -
ddfeb1b2d3bbfc130a6692348ca5a6b4f1ef808e4141a321a1e45d98febdcb48 - C:\Users\analyst\AppData\Roaming\Microsoft\svchcst.exe -
51c71b6f1852e15afd6d40da6c35a418189acbc722590e3cc1d4554b18e76eaf
Embedded URLs
- http://crl.thawte.com/ThawteTimestampingCA.crl0
- http://ts-aia.ws.symantec.com/tss-ca-g2.cer0
- http://ts-crl.ws.symantec.com/tss-ca-g2.crl0
- https://www.verisign.com/rpa
- http://sf.symcb.com/sf.crl0a
- https://d.symcb.com/rpa0
- http://sf.symcb.com/sf.crt0
- https://www.verisign.com/cps0*
- https://www.verisign.com/rpa0
- http://logo.verisign.com/vslogo.gif04
- http://crl.verisign.com/pca3-g5.crl04
- http://sv.symcb.com/sv.crl0a
- http://sv.symcb.com/sv.crt0
- http://www.symauth.com/cps0
- http://www.symauth.com/rpa00
- http://s1.symcb.com/pca3-g5.crl0
- http://www.eyuyan.com
- 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=1787810045&P2=404&P3=2&P4=CZrMFmSqJrwiy111WX%2bnklyG7NsNHOAvThtWFtaI6vdj2AjkFBLWnzkojJXEb1LNPTnV9yOjTpnI4dWieJBEcw%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
- http://203.26.79.13/filestreamingservice/files/c74a5353-3e6a-42b7-94d6-9b96c560c89a?P1=1787810095&P2=404&P3=2&P4=cjLJOAM8M8508M8Dw9WQI1qXCuAUTHQklInStqgOHtZxfKRnnPam6K6QVmmKe11RoxpsnfBtAnuE0uphlkMnPQ%3d%3d&cacheHostOrigin=msedge.b.tlu.dl.delivery.mp.microsoft.com
Embedded domains
- proc.name
- crl.thawte.com
- ts-aia.ws.symantec.com
- ts-crl.ws.symantec.com
- www.verisign.com
- sf.symcb.com
- d.symcb.com
- logo.verisign.com
- crl.verisign.com
- sv.symcb.com
- www.symauth.com
- s1.symcb.com
- www.eyuyan.com
Embedded IP addresses
- 20.89.1.8
- 172.215.188.232
- 4.230.171.124
- 52.230.59.222
- 135.233.95.144
- 4.150.223.115
- 135.232.92.97
- 20.42.73.24
- 52.123.129.14
- 40.99.133.226
- 20.231.239.246
- 52.123.128.14
- 40.104.4.2
- 162.159.142.9
- 135.233.45.221
- 172.178.240.162
- 52.182.141.63
- 20.42.65.88
- 52.123.252.219
- 203.26.79.13
- 52.148.114.188
- 74.179.71.159
- 48.211.4.16
- 125.56.205.33
- 125.56.205.32
Registry keys
- HKLM\SYSTEM\CurrentControlSet\Control\Terminal
File paths
- C:\ProgramData\Microsoft\Windows\Start
- C:\Documents
- c:\windows\system32\termsrv.dll
- C:\WINDOWS\system32\termsrv.dll
- C:\WINDOWS\system32\Termsrvs.dll
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Analyzed on MalwareAnalyzer by Cyble · Open interactive report