tofsee | 3878ebdeaa9e027240ca37b48fc74c9d1f1e58e17708d33b050af65cc2ac66e1

Analysis

max time kernel
146s
max time network
150s
platform
windows7_x64
resource
win7-20220901-en
resource tags

arch:x64arch:x86image:win7-20220901-enlocale:en-usos:windows7-x64system
submitted
06/02/2023, 20:08

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General

Target

file.exe
Size

301KB
MD5

ae9dc34b6a8ea00485a79cc48fc59662
SHA1

0e623ec7aaa91275e2fb0bcad85caa360b1fd296
SHA256

3878ebdeaa9e027240ca37b48fc74c9d1f1e58e17708d33b050af65cc2ac66e1
SHA512

a4dd1994fddd471c5ad4394e4c85f9f762bc4a82286d5e902fc5b837d7a9bc5c28e2098b802e21243d833e7b1f8fc6f154857f4712c721d0d1e25d383508a0ae
SSDEEP

3072:CBLb6b6cLxMRGDLx1l9yy70oMh5KGlF2Lw9M4uQjiMTE5/3RbPafVi:C1ZcLxzR1/ooTfLw9BuQj9M3lPat

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

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\SysWOW64\gopybkpb = "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

pid	Process
1200	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\gopybkpb\ImagePath = "C:\\Windows\\SysWOW64\\gopybkpb\\admxxttq.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
1668	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
1608	admxxttq.exe

Drops file in System32 directory 1 IoCs

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

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1608 set thread context of 1668	1608	admxxttq.exe	40

Launches sc.exe 3 IoCs

Sc.exe is a Windows utlilty to control services on the system.

pid	Process
1824	sc.exe
1444	sc.exe
988	sc.exe

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

System Information Discovery
T1082

Modifies data under HKEY_USERS 2 IoCs

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

description	pid	Process	procid_target
PID 840 wrote to memory of 1980	840	file.exe	27
PID 840 wrote to memory of 1980	840	file.exe	27
PID 840 wrote to memory of 1980	840	file.exe	27
PID 840 wrote to memory of 1980	840	file.exe	27
PID 840 wrote to memory of 688	840	file.exe	29
PID 840 wrote to memory of 688	840	file.exe	29
PID 840 wrote to memory of 688	840	file.exe	29
PID 840 wrote to memory of 688	840	file.exe	29
PID 840 wrote to memory of 1824	840	file.exe	31
PID 840 wrote to memory of 1824	840	file.exe	31
PID 840 wrote to memory of 1824	840	file.exe	31
PID 840 wrote to memory of 1824	840	file.exe	31
PID 840 wrote to memory of 1444	840	file.exe	33
PID 840 wrote to memory of 1444	840	file.exe	33
PID 840 wrote to memory of 1444	840	file.exe	33
PID 840 wrote to memory of 1444	840	file.exe	33
PID 840 wrote to memory of 988	840	file.exe	35
PID 840 wrote to memory of 988	840	file.exe	35
PID 840 wrote to memory of 988	840	file.exe	35
PID 840 wrote to memory of 988	840	file.exe	35
PID 840 wrote to memory of 1200	840	file.exe	38
PID 840 wrote to memory of 1200	840	file.exe	38
PID 840 wrote to memory of 1200	840	file.exe	38
PID 840 wrote to memory of 1200	840	file.exe	38
PID 1608 wrote to memory of 1668	1608	admxxttq.exe	40
PID 1608 wrote to memory of 1668	1608	admxxttq.exe	40
PID 1608 wrote to memory of 1668	1608	admxxttq.exe	40
PID 1608 wrote to memory of 1668	1608	admxxttq.exe	40
PID 1608 wrote to memory of 1668	1608	admxxttq.exe	40
PID 1608 wrote to memory of 1668	1608	admxxttq.exe	40

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:840
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\gopybkpb\
  2⤵
  PID:1980
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\admxxttq.exe" C:\Windows\SysWOW64\gopybkpb\
  2⤵
  PID:688
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create gopybkpb binPath= "C:\Windows\SysWOW64\gopybkpb\admxxttq.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:1824
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description gopybkpb "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:1444
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start gopybkpb
  2⤵
  - Launches sc.exe
  PID:988
- 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:1200

C:\Windows\SysWOW64\gopybkpb\admxxttq.exe
C:\Windows\SysWOW64\gopybkpb\admxxttq.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1608
- 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:1668

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Modify Existing Service

T1031

New Service

T1050

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

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\admxxttq.exe

Filesize
11.2MB

MD5
cdbfc498f1dcb8a1d07f2033e97c83b9

SHA1
8b4befd43fb3d20f56406e2df1941d50db11d2e3

SHA256
7c61d07330bfe552f8fa44be65600dc094865d191829541527ecf624e21211a1

SHA512
d06f8a16972da7c1554e70d19560624968f7c0327c04caab3a312c883899ff1c07c6f4f2d6cb4a6fb05f72a716a4600828262d4aab11bc7fd57b888f7db027a2

Download Submit
C:\Windows\SysWOW64\gopybkpb\admxxttq.exe

Filesize
11.2MB

MD5
cdbfc498f1dcb8a1d07f2033e97c83b9

SHA1
8b4befd43fb3d20f56406e2df1941d50db11d2e3

SHA256
7c61d07330bfe552f8fa44be65600dc094865d191829541527ecf624e21211a1

SHA512
d06f8a16972da7c1554e70d19560624968f7c0327c04caab3a312c883899ff1c07c6f4f2d6cb4a6fb05f72a716a4600828262d4aab11bc7fd57b888f7db027a2

Download Submit
memory/840-56-0x000000000026C000-0x0000000000281000-memory.dmp

Filesize
84KB

Download
memory/840-58-0x0000000000400000-0x00000000004C8000-memory.dmp

Filesize
800KB

Download
memory/840-54-0x0000000076561000-0x0000000076563000-memory.dmp

Filesize
8KB

Download
memory/840-57-0x00000000003C0000-0x00000000003D3000-memory.dmp

Filesize
76KB

Download
memory/840-66-0x000000000026C000-0x0000000000281000-memory.dmp

Filesize
84KB

Download
memory/840-67-0x0000000000400000-0x00000000004C8000-memory.dmp

Filesize
800KB

Download
memory/1608-76-0x0000000000400000-0x00000000004C8000-memory.dmp

Filesize
800KB

Download
memory/1608-75-0x000000000026C000-0x0000000000281000-memory.dmp

Filesize
84KB

Download
memory/1668-72-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1668-70-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1668-79-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1668-80-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads