MALICIOUS — crypto.dll

MALICIOUS — crypto.dll is a pe sample analyzed by MalwareAnalyzer by Cyble with a malicious verdict (99/100), attributed to the ImJfa4pdRVd family. 6 of 55 detection engines flagged it, exhibiting 3 ATT&CK techniques.

Identification

SHA-256: f88fb2dd98f55c445ccc9c1a989a5067e01bb0450c763c4c693c577c689fdcae
SHA-1: 4a8e14ddc4e755087a0461666559ed244cde4e76
MD5: 0a32e30750fba99ad004a8acdc0b8be3
imphash: e60d0e6577962a1096407913ed128742
ssdeep: 3072:IyrN/sVywaEj1UsEOBYJwyrN/sVywaEj1Us6W71bvsuD6xp1sUzh:Nh9wv1Ut3nh9wv1U1WZ7stx/ZF
TLSH: T1A93E0207250695E6C5D3FE146C6CD31EA8A25F5C49329E802C026BDFA00EB27B5E4BCD
Submitted as: crypto.dll
File type: pe · Size: 145408 bytes
Verdict: malicious (99/100) · Family: ImJfa4pdRVd

Detections (6 of 55 engines)

MalwareAnalyser heuristics (entropy/packer): UPX
ClamAV (daily): Win.Ransomware.Somhoveran-9870372-0
Detect It Easy (packer/type): DIE:Turbo Linker
Microsoft Defender: Trojan:Win32/Vindor!pz
Emsisoft (Emergency Kit): Gen:Trojan.ShellHook.imJfa4pdRVd
Kaspersky (KVRT): Worm.Win32.Wenper.b

MITRE ATT&CK

Why this verdict

The malicious score of 99/100 is the fusion of 8 weighted signals:

ClamAV (daily) flagged Win.Ransomware.Somhoveran-9870372-0 (rule Win.Ransomware.Somhoveran-9870372-0) - engine signal, weight 0.90, confidence 0.95
Dropped a malicious payload (Somhoveran): net.cpl - dynamic signal, weight 0.62, confidence 0.90
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
Contacted 23 external host(s) at runtime (16 HTTP) - network signal, weight 0.40, confidence 0.80
Detect It Easy (packer/type) flagged DIE:Turbo Linker (rule DIE:Turbo Linker) - engine signal, weight 0.35, confidence 0.70
Packing/obfuscation: UPX, high-entropy-sections:UPX1, Turbo Linker - static signal, weight 0.25, confidence 0.55
Observed at runtime: Modify Registry (T1112) (rule Modify Registry) - dynamic signal, weight 0.12, confidence 0.90

Dynamic analysis (windows)

318 behavior events · 2 ATT&CK techniques · 4 dropped files.

Dropped files

C:\Windows\System32\net.cpl - a1857687227db00c012dc9a8d1b028f12bd0b64e752c7a638bf4e6a9854fbeb2
C:\Windows\System32\wlogon.dll - 94ac65e17ca4f2b9e36adfe8ec6d812e767ea172369b0150bd89b717300b89f9
C:\Windows\System32\crypto.dll - 2c4aa7cb34f75764a8a6ca2f7210e1b73d59050a2c3a18abcc11a6ec30de785c
C:\Windows\System32\lcss.exe - 80cf29359ab47ee50ae54fdb6508d6acde682491f4d0faa894577aa0bfc1ddf3

Embedded URLs

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=1787658496&P2=404&P3=2&P4=BqjYHffz0hiNWPfG%2fMPe%2bSmkong5tJcZjLrPKdqwv%2fTYjVp4uj0u56t%2bMs7PRbutKVcHxzGI0UBsgScHhTww6A%3d%3d&cacheHostOrigin=msedge.b.tlu.dl.delivery.mp.microsoft.com

Embedded IP addresses

74.179.71.159
52.123.252.235
20.42.65.94
52.123.252.239
172.83.156.122
4.247.188.233
4.230.171.124
52.253.84.76
20.165.94.63
20.42.65.84
20.165.94.54
20.236.44.162
40.99.134.18
52.123.129.14
51.105.71.137
135.233.95.144
135.233.45.223
203.26.79.13
72.154.7.103
135.232.92.34
52.110.12.10
52.148.114.188
52.110.12.54

More ImJfa4pdRVd samples · Latest analyzed threats · ATT&CK coverage

Analyzed on MalwareAnalyzer by Cyble · Open interactive report