tofsee | cf822f50e274b82120b3389049e8931948bc535a4b95c905efa9416225668c2e

Analysis

max time kernel
145s
max time network
136s
platform
windows10_x64
resource
win10-20220414-en
submitted
05-06-2022 09:25

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General

Target

cf822f50e274b82120b3389049e8931948bc535a4b95c905efa9416225668c2e.exe
Size

309KB
MD5

7d40376fee22fcd7c818a9fec569ba68
SHA1

97e9ab6393116df99769e48595501b54fb01f65f
SHA256

cf822f50e274b82120b3389049e8931948bc535a4b95c905efa9416225668c2e
SHA512

2eaa34fbbfa4d03f6e7c1bf31f79880cea0ef00af17f13007aaf5d53cd15ed4632a4807408384a6392acb18e995eab6e77bb60413faee8814da5f9c6c0503e22

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

svartalfheim.top

jotunheim.name

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee

Windows security bypass 2 TTPs 1 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\SysWOW64\hxcpeydy = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050
Executes dropped EXE 1 IoCs

Processes:

cmsyrbop.exe

pid process

4836 cmsyrbop.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

2352 netsh.exe

pid	process
4836	cmsyrbop.exe

pid	process
2352	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\hxcpeydy\ImagePath = "C:\\Windows\\SysWOW64\\hxcpeydy\\cmsyrbop.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

4048 svchost.exe
Drops file in System32 directory 1 IoCs

Processes:

svchost.exe

description ioc process

File created C:\Windows\SysWOW64\config\systemprofile:.repos svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

cmsyrbop.exe

description pid process target process

PID 4836 set thread context of 4048 4836 cmsyrbop.exe svchost.exe
Launches sc.exe 3 IoCs
Sc.exe is a Windows utlilty to control services on the system.

Processes:

sc.exesc.exesc.exe

pid process

1644 sc.exe
4368 sc.exe
4916 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

pid	process
4048	svchost.exe

description	ioc	process
File created	C:\Windows\SysWOW64\config\systemprofile:.repos	svchost.exe

description	pid	process	target process
PID 4836 set thread context of 4048	4836	cmsyrbop.exe	svchost.exe

pid	process
1644	sc.exe
4368	sc.exe
4916	sc.exe

Modifies data under HKEY_USERS 2 IoCs

Processes:

svchost.exe

description	ioc	process
Key created	\REGISTRY\USER\.DEFAULT\Control Panel\Buses	svchost.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Control Panel\Buses\Config0 = 008d093f41be820624edb47d450dd49d084297dce82e72baa46d34fdc48d541d1b5628df81cd945d24edb47d470dd49d024195daf71261adc06d04fda6e22673bbc9154961cda56816d585447334e0a4644490bdb57a2def905e0dcbfdbd54758df21d5904fca76e14df8c4f703fed9d084295d9e13f4bb4c06d05c9c4e4241dd594450b3cfca76414d9b40e367b8be90d4091bda97520e892540ccff6bd54718bce15515bb9fd3041ed85487635e5a45314c18a84	svchost.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

cf822f50e274b82120b3389049e8931948bc535a4b95c905efa9416225668c2e.execmsyrbop.exe

description	pid	process	target process
PID 2956 wrote to memory of 4880	2956	cf822f50e274b82120b3389049e8931948bc535a4b95c905efa9416225668c2e.exe	cmd.exe
PID 2956 wrote to memory of 4880	2956	cf822f50e274b82120b3389049e8931948bc535a4b95c905efa9416225668c2e.exe	cmd.exe
PID 2956 wrote to memory of 4880	2956	cf822f50e274b82120b3389049e8931948bc535a4b95c905efa9416225668c2e.exe	cmd.exe
PID 2956 wrote to memory of 4004	2956	cf822f50e274b82120b3389049e8931948bc535a4b95c905efa9416225668c2e.exe	cmd.exe
PID 2956 wrote to memory of 4004	2956	cf822f50e274b82120b3389049e8931948bc535a4b95c905efa9416225668c2e.exe	cmd.exe
PID 2956 wrote to memory of 4004	2956	cf822f50e274b82120b3389049e8931948bc535a4b95c905efa9416225668c2e.exe	cmd.exe
PID 2956 wrote to memory of 1644	2956	cf822f50e274b82120b3389049e8931948bc535a4b95c905efa9416225668c2e.exe	sc.exe
PID 2956 wrote to memory of 1644	2956	cf822f50e274b82120b3389049e8931948bc535a4b95c905efa9416225668c2e.exe	sc.exe
PID 2956 wrote to memory of 1644	2956	cf822f50e274b82120b3389049e8931948bc535a4b95c905efa9416225668c2e.exe	sc.exe
PID 2956 wrote to memory of 4368	2956	cf822f50e274b82120b3389049e8931948bc535a4b95c905efa9416225668c2e.exe	sc.exe
PID 2956 wrote to memory of 4368	2956	cf822f50e274b82120b3389049e8931948bc535a4b95c905efa9416225668c2e.exe	sc.exe
PID 2956 wrote to memory of 4368	2956	cf822f50e274b82120b3389049e8931948bc535a4b95c905efa9416225668c2e.exe	sc.exe
PID 2956 wrote to memory of 4916	2956	cf822f50e274b82120b3389049e8931948bc535a4b95c905efa9416225668c2e.exe	sc.exe
PID 2956 wrote to memory of 4916	2956	cf822f50e274b82120b3389049e8931948bc535a4b95c905efa9416225668c2e.exe	sc.exe
PID 2956 wrote to memory of 4916	2956	cf822f50e274b82120b3389049e8931948bc535a4b95c905efa9416225668c2e.exe	sc.exe
PID 2956 wrote to memory of 2352	2956	cf822f50e274b82120b3389049e8931948bc535a4b95c905efa9416225668c2e.exe	netsh.exe
PID 2956 wrote to memory of 2352	2956	cf822f50e274b82120b3389049e8931948bc535a4b95c905efa9416225668c2e.exe	netsh.exe
PID 2956 wrote to memory of 2352	2956	cf822f50e274b82120b3389049e8931948bc535a4b95c905efa9416225668c2e.exe	netsh.exe
PID 4836 wrote to memory of 4048	4836	cmsyrbop.exe	svchost.exe
PID 4836 wrote to memory of 4048	4836	cmsyrbop.exe	svchost.exe
PID 4836 wrote to memory of 4048	4836	cmsyrbop.exe	svchost.exe
PID 4836 wrote to memory of 4048	4836	cmsyrbop.exe	svchost.exe
PID 4836 wrote to memory of 4048	4836	cmsyrbop.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\cf822f50e274b82120b3389049e8931948bc535a4b95c905efa9416225668c2e.exe
"C:\Users\Admin\AppData\Local\Temp\cf822f50e274b82120b3389049e8931948bc535a4b95c905efa9416225668c2e.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2956

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hxcpeydy\
2⤵
PID:4880

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\cmsyrbop.exe" C:\Windows\SysWOW64\hxcpeydy\
2⤵
PID:4004

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create hxcpeydy binPath= "C:\Windows\SysWOW64\hxcpeydy\cmsyrbop.exe /d\"C:\Users\Admin\AppData\Local\Temp\cf822f50e274b82120b3389049e8931948bc535a4b95c905efa9416225668c2e.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:1644

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description hxcpeydy "wifi internet conection"
2⤵
- Launches sc.exe
PID:4368

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start hxcpeydy
2⤵
- Launches sc.exe
PID:4916

C:\Windows\SysWOW64\netsh.exe
"C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
2⤵
- Modifies Windows Firewall
PID:2352

C:\Windows\SysWOW64\hxcpeydy\cmsyrbop.exe
C:\Windows\SysWOW64\hxcpeydy\cmsyrbop.exe /d"C:\Users\Admin\AppData\Local\Temp\cf822f50e274b82120b3389049e8931948bc535a4b95c905efa9416225668c2e.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4836

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Windows security bypass
- Sets service image path in registry
- Deletes itself
- Drops file in System32 directory
- Modifies data under HKEY_USERS
PID:4048

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

New Service

T1050

Modify Existing Service

T1031

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

New Service

T1050

Defense Evasion

Disabling Security Tools

T1089

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\cmsyrbop.exe
Filesize
13.9MB

MD5
93f39e951955ad8eab06791519bf8014

SHA1
d6ed1d82fa038e08ef410abc930bf507acd014f2

SHA256
6a2d3b64f188e8a91585dafa76d9f2511d7b357398c43186eb613cd330310c6d

SHA512
c2f0e40aa692711ed3ffa957ec0aa88ce0b1765f0bcaaaa471db7d5d5ff3451feb7b807efd096ce92993c3a94b260f52abdb89ab902cd643c299bf6132354019

Download Submit
C:\Windows\SysWOW64\hxcpeydy\cmsyrbop.exe
Filesize
13.9MB

MD5
93f39e951955ad8eab06791519bf8014

SHA1
d6ed1d82fa038e08ef410abc930bf507acd014f2

SHA256
6a2d3b64f188e8a91585dafa76d9f2511d7b357398c43186eb613cd330310c6d

SHA512
c2f0e40aa692711ed3ffa957ec0aa88ce0b1765f0bcaaaa471db7d5d5ff3451feb7b807efd096ce92993c3a94b260f52abdb89ab902cd643c299bf6132354019

Download Submit
memory/1644-184-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/1644-185-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/1644-187-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/1644-186-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/1644-183-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/1644-182-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/1644-180-0x0000000000000000-mapping.dmp

Download
memory/1644-181-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2352-221-0x0000000000000000-mapping.dmp

Download
memory/2956-138-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-165-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-130-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-131-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-132-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-133-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-134-0x00000000008A1000-0x00000000008B1000-memory.dmp

Filesize
64KB

Download
memory/2956-136-0x0000000000830000-0x0000000000843000-memory.dmp

Filesize
76KB

Download
memory/2956-135-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-137-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-117-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-139-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-140-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-141-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-142-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-143-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-144-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-145-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-146-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-148-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-149-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-150-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-147-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-152-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-153-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-154-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-151-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-155-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-157-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-156-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-158-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-159-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-160-0x0000000000400000-0x00000000004F2000-memory.dmp

Filesize
968KB

Download
memory/2956-161-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-162-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-163-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-164-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-129-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-166-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-227-0x0000000000400000-0x00000000004F2000-memory.dmp

Filesize
968KB

Download
memory/2956-225-0x0000000000830000-0x0000000000843000-memory.dmp

Filesize
76KB

Download
memory/2956-118-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-223-0x00000000008A1000-0x00000000008B1000-memory.dmp

Filesize
64KB

Download
memory/2956-119-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-120-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-121-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-122-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-123-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-124-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-125-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-126-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-128-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/2956-127-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/4004-178-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/4004-176-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/4004-177-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/4004-173-0x0000000000000000-mapping.dmp

Download
memory/4004-174-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/4004-175-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/4048-486-0x00000000027C0000-0x00000000027D5000-memory.dmp

Filesize
84KB

Download
memory/4048-393-0x00000000027C0000-0x00000000027D5000-memory.dmp

Filesize
84KB

Download
memory/4048-300-0x00000000027C9A6B-mapping.dmp

Download
memory/4368-191-0x0000000000000000-mapping.dmp

Download
memory/4836-270-0x0000000000500000-0x000000000064A000-memory.dmp

Filesize
1.3MB

Download
memory/4836-267-0x000000000083C000-0x000000000084C000-memory.dmp

Filesize
64KB

Download
memory/4836-308-0x000000000083C000-0x000000000084C000-memory.dmp

Filesize
64KB

Download
memory/4836-311-0x0000000000400000-0x00000000004F2000-memory.dmp

Filesize
968KB

Download
memory/4880-169-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/4880-168-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/4880-167-0x0000000000000000-mapping.dmp

Download
memory/4880-170-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/4880-171-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/4880-172-0x0000000077820000-0x00000000779AE000-memory.dmp

Filesize
1.6MB

Download
memory/4916-202-0x0000000000000000-mapping.dmp

Download