tofsee | d2363a2f08c7a16ad6feef15bd342060822ed7908ddc6923ff84a9d5c5fa5fed

Analysis

max time kernel
140s
max time network
143s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
11/01/2023, 00:32

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General

Target
file.exe
Size 267KB
Sample230111-avmfcaaa99
SHA256 d2363a2f08c7a16ad6feef15bd342060822ed7908ddc6923ff84a9d5c5fa5fed
MD5 a5e9b6c198fcbb112c7465c22fc0c749
SHA1 ca3a73c2ef47ae6d128a0711a79184e81b62114c
SHA512 efba842c0ac06db14bbeaeb2b408e7b06c11f5d7104ff887db146282308643bfa9364574ca8bf2e7b41dab5d2cd844750861d9493d08dd62d430c6cf48336922
SSDEEP 3072:rXEQfL/7MHFLaEmrMT25JFlm0k3ZU5MUzPS7gsupupKa3BNCanng0Pb:D90HFLFTiTkm5MUzPS7maRNng6
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\lojfoady = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050

Executes dropped EXE 1 IoCs

pid	Process
1768	grnsjcod.exe

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
568	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\lojfoady\ImagePath = "C:\\Windows\\SysWOW64\\lojfoady\\grnsjcod.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
1552	svchost.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1768 set thread context of 1552	1768	grnsjcod.exe	40

Launches sc.exe 3 IoCs

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

pid	Process
1192	sc.exe
2044	sc.exe
2036	sc.exe

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

System Information Discovery
T1082

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 1676 wrote to memory of 1144	1676	file.exe	27
PID 1676 wrote to memory of 1144	1676	file.exe	27
PID 1676 wrote to memory of 1144	1676	file.exe	27
PID 1676 wrote to memory of 1144	1676	file.exe	27
PID 1676 wrote to memory of 1364	1676	file.exe	29
PID 1676 wrote to memory of 1364	1676	file.exe	29
PID 1676 wrote to memory of 1364	1676	file.exe	29
PID 1676 wrote to memory of 1364	1676	file.exe	29
PID 1676 wrote to memory of 1192	1676	file.exe	31
PID 1676 wrote to memory of 1192	1676	file.exe	31
PID 1676 wrote to memory of 1192	1676	file.exe	31
PID 1676 wrote to memory of 1192	1676	file.exe	31
PID 1676 wrote to memory of 2044	1676	file.exe	33
PID 1676 wrote to memory of 2044	1676	file.exe	33
PID 1676 wrote to memory of 2044	1676	file.exe	33
PID 1676 wrote to memory of 2044	1676	file.exe	33
PID 1676 wrote to memory of 2036	1676	file.exe	35
PID 1676 wrote to memory of 2036	1676	file.exe	35
PID 1676 wrote to memory of 2036	1676	file.exe	35
PID 1676 wrote to memory of 2036	1676	file.exe	35
PID 1676 wrote to memory of 568	1676	file.exe	38
PID 1676 wrote to memory of 568	1676	file.exe	38
PID 1676 wrote to memory of 568	1676	file.exe	38
PID 1676 wrote to memory of 568	1676	file.exe	38
PID 1768 wrote to memory of 1552	1768	grnsjcod.exe	40
PID 1768 wrote to memory of 1552	1768	grnsjcod.exe	40
PID 1768 wrote to memory of 1552	1768	grnsjcod.exe	40
PID 1768 wrote to memory of 1552	1768	grnsjcod.exe	40
PID 1768 wrote to memory of 1552	1768	grnsjcod.exe	40
PID 1768 wrote to memory of 1552	1768	grnsjcod.exe	40

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1676
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\lojfoady\
  2⤵
  PID:1144
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\grnsjcod.exe" C:\Windows\SysWOW64\lojfoady\
  2⤵
  PID:1364
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create lojfoady binPath= "C:\Windows\SysWOW64\lojfoady\grnsjcod.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:1192
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description lojfoady "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2044
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start lojfoady
  2⤵
  - Launches sc.exe
  PID:2036
- 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:568

C:\Windows\SysWOW64\lojfoady\grnsjcod.exe
C:\Windows\SysWOW64\lojfoady\grnsjcod.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1768
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  PID:1552

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

grnsjcod.exe

Path C:\Users\Admin\AppData\Local\Temp\grnsjcod.exe
Size 11.6MB
SHA256 ac8db92a772571d0b294bd8b315f523e0f74449986559b01cd21c123b514bcd3
MD5 ded81b7ce5cd3a2acfdffe4909d999a8
SHA1 fd0980d4c11d6116d2a7fd7ed9c4db373eb5b473
SHA512 0f07658fcd0e1487e5eb2dd2f8cbdb32eeaf1329680a2e01b6548065ddac5854cc26b09e81725f3cc6ef6e6cdd59f9f4afdb473ec63f3647953e61683ad4146c
SSDEEP 196608:v77777777777777777777777777777777777777777777777777777777777777H:v777777777777777777777777777777H
MD5 SHA1 SHA512 SSDEEP

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grnsjcod.exe

Path C:\Windows\SysWOW64\lojfoady\grnsjcod.exe
Size 11.6MB
SHA256 ac8db92a772571d0b294bd8b315f523e0f74449986559b01cd21c123b514bcd3
MD5 ded81b7ce5cd3a2acfdffe4909d999a8
SHA1 fd0980d4c11d6116d2a7fd7ed9c4db373eb5b473
SHA512 0f07658fcd0e1487e5eb2dd2f8cbdb32eeaf1329680a2e01b6548065ddac5854cc26b09e81725f3cc6ef6e6cdd59f9f4afdb473ec63f3647953e61683ad4146c
SSDEEP 196608:v77777777777777777777777777777777777777777777777777777777777777H:v777777777777777777777777777777H
MD5 SHA1 SHA512 SSDEEP

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memory/1552-72-0x00000000000C0000-0x00000000000D5000-memory.dmp

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memory/1552-82-0x00000000000C0000-0x00000000000D5000-memory.dmp

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memory/1552-81-0x00000000000C0000-0x00000000000D5000-memory.dmp

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memory/1552-70-0x00000000000C0000-0x00000000000D5000-memory.dmp

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memory/1676-54-0x0000000074C91000-0x0000000074C93000-memory.dmp

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memory/1676-66-0x0000000002D2D000-0x0000000002D3E000-memory.dmp

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memory/1676-67-0x0000000000400000-0x0000000002BAB000-memory.dmp

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memory/1676-60-0x0000000000400000-0x0000000002BAB000-memory.dmp

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memory/1676-59-0x0000000000230000-0x0000000000243000-memory.dmp

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memory/1676-58-0x0000000002D2D000-0x0000000002D3E000-memory.dmp

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memory/1768-69-0x0000000002D7D000-0x0000000002D8E000-memory.dmp

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memory/1768-78-0x0000000000400000-0x0000000002BAB000-memory.dmp

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memory/1768-77-0x0000000002D7D000-0x0000000002D8E000-memory.dmp

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memory/1768-79-0x0000000000400000-0x0000000002BAB000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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