home

csrss.exe

The executable csrss.exe has been detected as malware by 39 anti-virus scanners. It is set to automatically start when a user logs into Windows via the current user run registry key under the display name ‘Tok-Cirrhatus-1893’. While running, it connects to the Internet address ats.sbs.vip.dc11.lumsb.com on port 443.
MD5:
38b9ef80895a86ec6b1e4ad08bc61d67

SHA-1:
7addcdd62bd68692ec57d337a4dc6a2f55fe8fb9

SHA-256:
c0754d99f4bec88679d14e879c7dec5f94818e630dbba7fccd97c0e6e3e3851b

Scanner detections:
39 / 68

Status:
Malware

Analysis date:
5/21/2024 10:21:24 PM UTC  (today)

Scan engine
Detection
Engine version

Lavasoft Ad-Aware
Win32.Generic.497594
170

Agnitum Outpost
I-Worm.Brontok
7.1.1

AhnLab V3 Security
Win-Trojan/Brontok.524288
2015.07.03

Avira AntiVirus
WORM/Brontok.D.5
8.3.1.6

Arcabit
Win32.Generic.497594
1.0.0.425

avast!
Win32:Brontok-CE [Wrm]
2014.9-160818

AVG
Worm/Generic_c
2017.0.2648

Bitdefender
Win32.Generic.497594
1.0.20.1155

Bkav FE
W32.RontokbroYO
1.3.0.6979

Clam AntiVirus
Worm.Brontok.S
0.98/21511

Comodo Security
Worm.Win32.Brontok.CE
22647

Dr.Web
BackDoor.Generic.3162
9.0.1.0231

Emsisoft Anti-Malware
Win32.Generic.497594
8.16.08.18.06

ESET NOD32
Win32/Brontok.CE
10.11881

Fortinet FortiGate
Riskware/Generic.AC.1023
8/18/2016

F-Prot
W32/Brontok.C.gen
v6.4.7.1.166

F-Secure
Win32.Generic.497594
11.2016-18-08_5

G Data
Win32.Generic.497594
16.8.25

IKARUS anti.virus
Email-Worm.Win32.Brontok
t3scan.1.9.5.0

K7 AntiVirus
Trojan
13.205.16443

Kaspersky
Email-Worm.Win32.Brontok
14.0.0.-266

Malwarebytes
Worm.Brontok
v2016.08.18.06

McAfee
W32/Rontokbro.gen@MM
5600.6304

Microsoft Security Essentials
Worm:Win32/Brontok.M@mm
1.1.11804.0

MicroWorld eScan
Win32.Generic.497594
17.0.0.693

NANO AntiVirus
Trojan.Win32.Alman.btuxjj
0.30.24.2320

nProtect
Win32.Generic.497594
15.07.02.01

Panda Antivirus
W32/Brontok.N.worm
16.08.18.06

Qihoo 360 Security
HEUR/QVM18.1.Malware.Gen
1.0.0.1015

Quick Heal
W32.Brontok.Q
8.16.14.00

Rising Antivirus
PE:Trojan.Win32.Mnless.dyr!1075184010
23.00.65.16816

Sophos
W32/Brontok-K
4.98

Total Defense
Win32/Robknot.BM
37.1.62.1

Trend Micro House Call
WORM_RONTKBR.GEN
7.2.231

Trend Micro
WORM_RONTKBR.GEN
10.465.18

Vba32 AntiVirus
TScope.Trojan.VB
3.12.26.4

VIPRE Antivirus
Email-Worm.Win32.Brontok.ik
41662

ViRobot
I-Worm.Win32.Brontok.45543[h]
2014.3.20.0

Zillya! Antivirus
Worm.Brontok.Win32.321
2.0.0.2267

File size:
2.2 MB (2,281,959 bytes)

File type:
Executable application (Win32 EXE)

Common path:
C:\users\{user}\appdata\local\csrss.exe

File PE Metadata
OS version:
4.0

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
5.12

CTPH (ssdeep):
3072:C+U0uXe3PTbrg+U0uXe3PTbrg+U0uXe3PTbr:Cne3PTone3PTone3PT

Entry address:
0x32FCE

Entry point:
E9, 81, D1, FC, FF, 0C, 80, 02, 00, 00, 00, 00, 00, 00, 00, 00, 00, A5, 2F, 03, 00, 0C, 80, 02, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00...
 
[+]

Entropy:
0.6955

Packer / compiler:
MEW, 0x11 SE v1.2

Code size:
512 Bytes (512 bytes)

Startup File (User Run)
Registry location:
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

Name:
Tok-Cirrhatus-1893

Command:
"C:\users\{user}\appdata\local\br4809on.exe"


The executing file has been seen to make the following network communications in live environments.

TCP (HTTP SSL):
Connects to ats.sbs.vip.dc11.lumsb.com  (8.12.146.61:443)

TCP (HTTP):
Connects to unknown.prolexic.com  (72.52.4.121:80)

TCP (HTTP):
Connects to clipart.geo.vip.bf1.yahoo.com  (98.137.201.117:80)

Remove csrss.exe - Powered by Reason Core Security
herdProtect is a second line of defense malware removal platform powered by 68 anti-malware engines in the cloud. Since no single anti-malware program is perfect 100% of the time, herdProtect utilizes a 'herd' of multiple engines to guarantee the widest coverage and the earliest possible detection.