tofsee | 576ffcef61d05463d0ea4c6ccb923438b8f651479701d37ec20c7bc1898002df

Analysis

max time kernel
150s
max time network
151s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
27/10/2022, 06:19

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General

Target
file.exe
Size 256KB
Sample221027-g2819abcaj
SHA256 576ffcef61d05463d0ea4c6ccb923438b8f651479701d37ec20c7bc1898002df
MD5 0037ef6553c450d63ac03cbab7d985d1
SHA1 f61aea1512adb9e0adaefdb46204168d7c8b4917
SHA512 1b5a27cd7fbd2bbaa2e9a809be7f2503ef08f98fe91b111b373ce8c03c2fa9b7bb1d6e2d66bdba805dc4c190b3b786521f9d69de1b461d7ef1548783d2f06af6
SSDEEP 3072:gXiSntdXCuG80Y5DTLKeRvf/JJrXA6Afcj6RuxJ6oGKD5kH5U2RkRsUHZJWcth:UfntdXtPLhH064nRuePKDoRkRsKzWcD
MD5 SHA1 SHA512 SSDEEP

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\edfiyljc = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050

Executes dropped EXE 1 IoCs

pid	Process
824	tiwtmsor.exe

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
1832	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\edfiyljc\ImagePath = "C:\\Windows\\SysWOW64\\edfiyljc\\tiwtmsor.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
1100	svchost.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 824 set thread context of 1100	824	tiwtmsor.exe	41

Launches sc.exe 3 IoCs

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

pid	Process
1204	sc.exe
1288	sc.exe
1520	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 1996 wrote to memory of 888	1996	file.exe	28
PID 1996 wrote to memory of 888	1996	file.exe	28
PID 1996 wrote to memory of 888	1996	file.exe	28
PID 1996 wrote to memory of 888	1996	file.exe	28
PID 1996 wrote to memory of 1492	1996	file.exe	30
PID 1996 wrote to memory of 1492	1996	file.exe	30
PID 1996 wrote to memory of 1492	1996	file.exe	30
PID 1996 wrote to memory of 1492	1996	file.exe	30
PID 1996 wrote to memory of 1204	1996	file.exe	32
PID 1996 wrote to memory of 1204	1996	file.exe	32
PID 1996 wrote to memory of 1204	1996	file.exe	32
PID 1996 wrote to memory of 1204	1996	file.exe	32
PID 1996 wrote to memory of 1288	1996	file.exe	34
PID 1996 wrote to memory of 1288	1996	file.exe	34
PID 1996 wrote to memory of 1288	1996	file.exe	34
PID 1996 wrote to memory of 1288	1996	file.exe	34
PID 1996 wrote to memory of 1520	1996	file.exe	36
PID 1996 wrote to memory of 1520	1996	file.exe	36
PID 1996 wrote to memory of 1520	1996	file.exe	36
PID 1996 wrote to memory of 1520	1996	file.exe	36
PID 1996 wrote to memory of 1832	1996	file.exe	39
PID 1996 wrote to memory of 1832	1996	file.exe	39
PID 1996 wrote to memory of 1832	1996	file.exe	39
PID 1996 wrote to memory of 1832	1996	file.exe	39
PID 824 wrote to memory of 1100	824	tiwtmsor.exe	41
PID 824 wrote to memory of 1100	824	tiwtmsor.exe	41
PID 824 wrote to memory of 1100	824	tiwtmsor.exe	41
PID 824 wrote to memory of 1100	824	tiwtmsor.exe	41
PID 824 wrote to memory of 1100	824	tiwtmsor.exe	41
PID 824 wrote to memory of 1100	824	tiwtmsor.exe	41

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1996
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\edfiyljc\
  2⤵
  PID:888
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\tiwtmsor.exe" C:\Windows\SysWOW64\edfiyljc\
  2⤵
  PID:1492
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create edfiyljc binPath= "C:\Windows\SysWOW64\edfiyljc\tiwtmsor.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:1204
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description edfiyljc "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:1288
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start edfiyljc
  2⤵
  - Launches sc.exe
  PID:1520
- 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:1832

C:\Windows\SysWOW64\edfiyljc\tiwtmsor.exe
C:\Windows\SysWOW64\edfiyljc\tiwtmsor.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:824
- 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:1100

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

tiwtmsor.exe

Path C:\Users\Admin\AppData\Local\Temp\tiwtmsor.exe
Size 12.0MB
SHA256 ae669d424b84cf6ddda8e4c82c5b6d2eeb30a2ad97f62297755245b5b99b361c
MD5 c883dfd3db78ffebf9976059fa9b7b08
SHA1 241ec559a4cef0ae0ad57d107b82ec7baea67ec4
SHA512 dd85a59348d71d6834dc9180780796ffdca9854461b450d116b624663dde61ecd540f786759d8c7d50159bfeddcbf4d1881241824c032c480ce73f99a60ca705
SSDEEP 49152:kFL3z3kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk:kFv
MD5 SHA1 SHA512 SSDEEP

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tiwtmsor.exe

Path C:\Windows\SysWOW64\edfiyljc\tiwtmsor.exe
Size 12.0MB
SHA256 ae669d424b84cf6ddda8e4c82c5b6d2eeb30a2ad97f62297755245b5b99b361c
MD5 c883dfd3db78ffebf9976059fa9b7b08
SHA1 241ec559a4cef0ae0ad57d107b82ec7baea67ec4
SHA512 dd85a59348d71d6834dc9180780796ffdca9854461b450d116b624663dde61ecd540f786759d8c7d50159bfeddcbf4d1881241824c032c480ce73f99a60ca705
SSDEEP 49152:kFL3z3kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk:kFv
MD5 SHA1 SHA512 SSDEEP

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memory/824-66-0x0000000002DB8000-0x0000000002DCE000-memory.dmp

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memory/824-80-0x0000000000400000-0x0000000002C2E000-memory.dmp

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memory/824-78-0x0000000002DB8000-0x0000000002DCE000-memory.dmp

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memory/1100-72-0x00000000000C0000-0x00000000000D5000-memory.dmp

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memory/1100-87-0x00000000000C0000-0x00000000000D5000-memory.dmp

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memory/1100-85-0x00000000001C0000-0x00000000001C6000-memory.dmp

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memory/1100-82-0x0000000001860000-0x0000000001A6F000-memory.dmp

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memory/1100-81-0x00000000000C0000-0x00000000000D5000-memory.dmp

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memory/1100-74-0x00000000000C0000-0x00000000000D5000-memory.dmp

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memory/1996-69-0x0000000000400000-0x0000000002C2E000-memory.dmp

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memory/1996-58-0x0000000002D18000-0x0000000002D2E000-memory.dmp

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memory/1996-55-0x0000000075281000-0x0000000075283000-memory.dmp

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memory/1996-68-0x0000000002D18000-0x0000000002D2E000-memory.dmp

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memory/1996-54-0x0000000002D18000-0x0000000002D2E000-memory.dmp

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memory/1996-61-0x0000000000400000-0x0000000002C2E000-memory.dmp

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memory/1996-59-0x0000000000220000-0x0000000000233000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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