tofsee | 49d8d8aefa86738d67fdb9600d9150126573954f1c062a7a14c76a0d1d2539a5

General

Target

file.exe
Size

299KB
MD5

a21bdfec619934728706de4bf42f4d7c
SHA1

d8dfcfb85ca4b68219a3329b90f400a76dc4dba8
SHA256

49d8d8aefa86738d67fdb9600d9150126573954f1c062a7a14c76a0d1d2539a5
SHA512

e28798a28b7e2199c4c933452c934462d2a96a8974de947bbbbb7207f59c49001c854c3fc59fa8b4fadca120b47ed025b1a1e3016ebde5565d91cf54cb5a5b79
SSDEEP

6144:C9jtL3d9QwGi6eL78QYvNC4GuQj9LA9a:C9tD8w96K71cN6ljNe

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

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\ayvcsoeq = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

1276 netsh.exe

pid	process
1276	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\ayvcsoeq\ImagePath = "C:\\Windows\\SysWOW64\\ayvcsoeq\\lrjydwn.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

1408 svchost.exe
Executes dropped EXE 1 IoCs

Processes:

lrjydwn.exe

pid process

1816 lrjydwn.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:

lrjydwn.exe

description pid process target process

PID 1816 set thread context of 1408 1816 lrjydwn.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

1552 sc.exe
1496 sc.exe
1780 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
1408	svchost.exe

pid	process
1816	lrjydwn.exe

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

description	pid	process	target process
PID 1816 set thread context of 1408	1816	lrjydwn.exe	svchost.exe

pid	process
1552	sc.exe
1496	sc.exe
1780	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 = 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	svchost.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

file.exelrjydwn.exe

description	pid	process	target process
PID 2012 wrote to memory of 1984	2012	file.exe	cmd.exe
PID 2012 wrote to memory of 1984	2012	file.exe	cmd.exe
PID 2012 wrote to memory of 1984	2012	file.exe	cmd.exe
PID 2012 wrote to memory of 1984	2012	file.exe	cmd.exe
PID 2012 wrote to memory of 1928	2012	file.exe	cmd.exe
PID 2012 wrote to memory of 1928	2012	file.exe	cmd.exe
PID 2012 wrote to memory of 1928	2012	file.exe	cmd.exe
PID 2012 wrote to memory of 1928	2012	file.exe	cmd.exe
PID 2012 wrote to memory of 1552	2012	file.exe	sc.exe
PID 2012 wrote to memory of 1552	2012	file.exe	sc.exe
PID 2012 wrote to memory of 1552	2012	file.exe	sc.exe
PID 2012 wrote to memory of 1552	2012	file.exe	sc.exe
PID 2012 wrote to memory of 1496	2012	file.exe	sc.exe
PID 2012 wrote to memory of 1496	2012	file.exe	sc.exe
PID 2012 wrote to memory of 1496	2012	file.exe	sc.exe
PID 2012 wrote to memory of 1496	2012	file.exe	sc.exe
PID 2012 wrote to memory of 1780	2012	file.exe	sc.exe
PID 2012 wrote to memory of 1780	2012	file.exe	sc.exe
PID 2012 wrote to memory of 1780	2012	file.exe	sc.exe
PID 2012 wrote to memory of 1780	2012	file.exe	sc.exe
PID 2012 wrote to memory of 1276	2012	file.exe	netsh.exe
PID 2012 wrote to memory of 1276	2012	file.exe	netsh.exe
PID 2012 wrote to memory of 1276	2012	file.exe	netsh.exe
PID 2012 wrote to memory of 1276	2012	file.exe	netsh.exe
PID 1816 wrote to memory of 1408	1816	lrjydwn.exe	svchost.exe
PID 1816 wrote to memory of 1408	1816	lrjydwn.exe	svchost.exe
PID 1816 wrote to memory of 1408	1816	lrjydwn.exe	svchost.exe
PID 1816 wrote to memory of 1408	1816	lrjydwn.exe	svchost.exe
PID 1816 wrote to memory of 1408	1816	lrjydwn.exe	svchost.exe
PID 1816 wrote to memory of 1408	1816	lrjydwn.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2012

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ayvcsoeq\
2⤵
PID:1984

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\lrjydwn.exe" C:\Windows\SysWOW64\ayvcsoeq\
2⤵
PID:1928

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create ayvcsoeq binPath= "C:\Windows\SysWOW64\ayvcsoeq\lrjydwn.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:1552

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description ayvcsoeq "wifi internet conection"
2⤵
- Launches sc.exe
PID:1496

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start ayvcsoeq
2⤵
- Launches sc.exe
PID:1780

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:1276

C:\Windows\SysWOW64\ayvcsoeq\lrjydwn.exe
C:\Windows\SysWOW64\ayvcsoeq\lrjydwn.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1816

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:1408

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\lrjydwn.exe
Filesize
12.3MB

MD5
1aaa94d63c737c045b52a623a938dd5f

SHA1
2e97c2178a4e6d2074fc41d71c91bd9d18ca7601

SHA256
a6d36108006d49ad2ae303617838399382de1f95aad32d89a51ed85f023b173f

SHA512
980643967dfc8010a6db3f063d1400ed8326fe2c819c02b5504a1149493a805f3b7d6a0cdbb664275c464674245e17998a27a29801b56f39ab3c4af578abcd6b

Download Submit
C:\Windows\SysWOW64\ayvcsoeq\lrjydwn.exe
Filesize
12.3MB

MD5
1aaa94d63c737c045b52a623a938dd5f

SHA1
2e97c2178a4e6d2074fc41d71c91bd9d18ca7601

SHA256
a6d36108006d49ad2ae303617838399382de1f95aad32d89a51ed85f023b173f

SHA512
980643967dfc8010a6db3f063d1400ed8326fe2c819c02b5504a1149493a805f3b7d6a0cdbb664275c464674245e17998a27a29801b56f39ab3c4af578abcd6b

Download Submit
memory/1276-65-0x0000000000000000-mapping.dmp

Download
memory/1408-72-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1408-70-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1408-80-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1408-79-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1408-73-0x0000000000089A6B-mapping.dmp

Download
memory/1496-62-0x0000000000000000-mapping.dmp

Download
memory/1552-61-0x0000000000000000-mapping.dmp

Download
memory/1780-63-0x0000000000000000-mapping.dmp

Download
memory/1816-75-0x000000000057C000-0x0000000000591000-memory.dmp

Filesize
84KB

Download
memory/1816-76-0x0000000000400000-0x00000000004C8000-memory.dmp

Filesize
800KB

Download
memory/1928-56-0x0000000000000000-mapping.dmp

Download
memory/1984-55-0x0000000000000000-mapping.dmp

Download
memory/2012-66-0x000000000066C000-0x0000000000681000-memory.dmp

Filesize
84KB

Download
memory/2012-67-0x0000000000400000-0x00000000004C8000-memory.dmp

Filesize
800KB

Download
memory/2012-58-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/2012-54-0x0000000075D61000-0x0000000075D63000-memory.dmp

Filesize
8KB

Download
memory/2012-57-0x000000000066C000-0x0000000000681000-memory.dmp

Filesize
84KB

Download
memory/2012-59-0x0000000000400000-0x00000000004C8000-memory.dmp

Filesize
800KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads