tofsee | b4870409b801692faf71a13983f411bc6d39d0503177b105f888c6d0097a3ab8

General

Target

b4870409b801692faf71a13983f411bc6d39d0503177b105f888c6d0097a3ab8.exe
Size

270KB
MD5

303b3d03908034295d2ede5b6ea07f57
SHA1

1fa657bc725e38ba78092c2cfb315b2c6266b5af
SHA256

b4870409b801692faf71a13983f411bc6d39d0503177b105f888c6d0097a3ab8
SHA512

8f629b62b5df4ec4b342aef4a7e4b18856c757fd00b9f4937fa5d9ae0ecea56c654fdc7af177b46429a2a1a3801e53ff6e9b16a7bddaaaea1f5af3be83d9a3e0

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

patmushta.info

ovicrush.cn

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee
Windows security bypass 2 TTPs
evasion trojan

Disabling Security Tools
T1089

Modify Registry
T1112
Creates new service(s) 1 TTPs
persistence

New Service
T1050
Executes dropped EXE 1 IoCs

Processes:

cxteyooq.exe

pid process

3352 cxteyooq.exe
Modifies Windows Firewall 1 TTPs
evasion

Modify Existing Service
T1031
Sets service image path in registry 2 TTPs
persistence

Registry Run Keys / Startup Folder
T1060

Modify Registry
T1112
Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

3084 svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

cxteyooq.exe

description pid process target process

PID 3352 set thread context of 3084 3352 cxteyooq.exe svchost.exe
Launches sc.exe
Sc.exe is a Windows utlilty to control services on the system.
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

pid	process
3352	cxteyooq.exe

pid	process
3084	svchost.exe

description	pid	process	target process
PID 3352 set thread context of 3084	3352	cxteyooq.exe	svchost.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

b4870409b801692faf71a13983f411bc6d39d0503177b105f888c6d0097a3ab8.execxteyooq.exe

description	pid	process	target process
PID 2444 wrote to memory of 2760	2444	b4870409b801692faf71a13983f411bc6d39d0503177b105f888c6d0097a3ab8.exe	cmd.exe
PID 2444 wrote to memory of 2760	2444	b4870409b801692faf71a13983f411bc6d39d0503177b105f888c6d0097a3ab8.exe	cmd.exe
PID 2444 wrote to memory of 2760	2444	b4870409b801692faf71a13983f411bc6d39d0503177b105f888c6d0097a3ab8.exe	cmd.exe
PID 2444 wrote to memory of 3780	2444	b4870409b801692faf71a13983f411bc6d39d0503177b105f888c6d0097a3ab8.exe	cmd.exe
PID 2444 wrote to memory of 3780	2444	b4870409b801692faf71a13983f411bc6d39d0503177b105f888c6d0097a3ab8.exe	cmd.exe
PID 2444 wrote to memory of 3780	2444	b4870409b801692faf71a13983f411bc6d39d0503177b105f888c6d0097a3ab8.exe	cmd.exe
PID 2444 wrote to memory of 3712	2444	b4870409b801692faf71a13983f411bc6d39d0503177b105f888c6d0097a3ab8.exe	sc.exe
PID 2444 wrote to memory of 3712	2444	b4870409b801692faf71a13983f411bc6d39d0503177b105f888c6d0097a3ab8.exe	sc.exe
PID 2444 wrote to memory of 3712	2444	b4870409b801692faf71a13983f411bc6d39d0503177b105f888c6d0097a3ab8.exe	sc.exe
PID 2444 wrote to memory of 3320	2444	b4870409b801692faf71a13983f411bc6d39d0503177b105f888c6d0097a3ab8.exe	sc.exe
PID 2444 wrote to memory of 3320	2444	b4870409b801692faf71a13983f411bc6d39d0503177b105f888c6d0097a3ab8.exe	sc.exe
PID 2444 wrote to memory of 3320	2444	b4870409b801692faf71a13983f411bc6d39d0503177b105f888c6d0097a3ab8.exe	sc.exe
PID 2444 wrote to memory of 2012	2444	b4870409b801692faf71a13983f411bc6d39d0503177b105f888c6d0097a3ab8.exe	sc.exe
PID 2444 wrote to memory of 2012	2444	b4870409b801692faf71a13983f411bc6d39d0503177b105f888c6d0097a3ab8.exe	sc.exe
PID 2444 wrote to memory of 2012	2444	b4870409b801692faf71a13983f411bc6d39d0503177b105f888c6d0097a3ab8.exe	sc.exe
PID 2444 wrote to memory of 580	2444	b4870409b801692faf71a13983f411bc6d39d0503177b105f888c6d0097a3ab8.exe	netsh.exe
PID 2444 wrote to memory of 580	2444	b4870409b801692faf71a13983f411bc6d39d0503177b105f888c6d0097a3ab8.exe	netsh.exe
PID 2444 wrote to memory of 580	2444	b4870409b801692faf71a13983f411bc6d39d0503177b105f888c6d0097a3ab8.exe	netsh.exe
PID 3352 wrote to memory of 3084	3352	cxteyooq.exe	svchost.exe
PID 3352 wrote to memory of 3084	3352	cxteyooq.exe	svchost.exe
PID 3352 wrote to memory of 3084	3352	cxteyooq.exe	svchost.exe
PID 3352 wrote to memory of 3084	3352	cxteyooq.exe	svchost.exe
PID 3352 wrote to memory of 3084	3352	cxteyooq.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\b4870409b801692faf71a13983f411bc6d39d0503177b105f888c6d0097a3ab8.exe
"C:\Users\Admin\AppData\Local\Temp\b4870409b801692faf71a13983f411bc6d39d0503177b105f888c6d0097a3ab8.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2444

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\nocazmoe\
2⤵
PID:2760

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\cxteyooq.exe" C:\Windows\SysWOW64\nocazmoe\
2⤵
PID:3780

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create nocazmoe binPath= "C:\Windows\SysWOW64\nocazmoe\cxteyooq.exe /d\"C:\Users\Admin\AppData\Local\Temp\b4870409b801692faf71a13983f411bc6d39d0503177b105f888c6d0097a3ab8.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
PID:3712

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description nocazmoe "wifi internet conection"
2⤵
PID:3320

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start nocazmoe
2⤵
PID:2012

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⤵
PID:580

C:\Windows\SysWOW64\nocazmoe\cxteyooq.exe
C:\Windows\SysWOW64\nocazmoe\cxteyooq.exe /d"C:\Users\Admin\AppData\Local\Temp\b4870409b801692faf71a13983f411bc6d39d0503177b105f888c6d0097a3ab8.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3352

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Deletes itself
PID:3084

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

New Service

1

T1050

Modify Existing Service

1

T1031

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

New Service

1

T1050

Defense Evasion

Disabling Security Tools

1

T1089

Modify Registry

2

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\cxteyooq.exe
MD5
afcc865fbdb9bd9b16c1c68d77a3d2c0

SHA1
4365c1ebb67556446da24fa3e20f76b667c8a3e4

SHA256
5422f5b0f36cbe22be997cb0de50a6f7603db1246c007578e579ad89da67071a

SHA512
b0f26b843c55ab839c2689f146c958ca6a0741ef8c5cc1d27c2427f081486e875bbcbfb0d14282cc15051771fc0bb22a3d545f20ab1851f8272faec7c87b2015

Download Submit
C:\Windows\SysWOW64\nocazmoe\cxteyooq.exe
MD5
afcc865fbdb9bd9b16c1c68d77a3d2c0

SHA1
4365c1ebb67556446da24fa3e20f76b667c8a3e4

SHA256
5422f5b0f36cbe22be997cb0de50a6f7603db1246c007578e579ad89da67071a

SHA512
b0f26b843c55ab839c2689f146c958ca6a0741ef8c5cc1d27c2427f081486e875bbcbfb0d14282cc15051771fc0bb22a3d545f20ab1851f8272faec7c87b2015

Download Submit
memory/2444-115-0x0000000000030000-0x000000000003D000-memory.dmp

Filesize
52KB

Download
memory/2444-116-0x00000000004E0000-0x000000000058E000-memory.dmp

Filesize
696KB

Download
memory/2444-117-0x0000000000400000-0x000000000044B000-memory.dmp

Filesize
300KB

Download
memory/3084-122-0x00000000005E0000-0x00000000005F5000-memory.dmp

Filesize
84KB

Download
memory/3084-125-0x00000000005E0000-0x00000000005F5000-memory.dmp

Filesize
84KB

Download
memory/3352-120-0x0000000000450000-0x000000000059A000-memory.dmp

Filesize
1.3MB

Download
memory/3352-121-0x0000000000400000-0x000000000044B000-memory.dmp

Filesize
300KB

Download

Analysis

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