tofsee | c51e25a145dddabd9ee8e15843f4e6bd6b9325a82a5f63f381305f90077cb1da

Analysis

max time kernel
31s
max time network
33s
platform
windows7_x64
resource
win7-20221111-en
resource tags

arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
submitted
10/01/2023, 12:23

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General

Target
file.exe
Size 280KB
Sample230110-pkgjnsbg3s
SHA256 c51e25a145dddabd9ee8e15843f4e6bd6b9325a82a5f63f381305f90077cb1da
MD5 baf0389531a4aa5a59f6518ed7b2abef
SHA1 84f24c0ce7cf1752310beadc9886519b9cbad5dc
SHA512 2ade07a9696ab8061b098abc55c9c0773c8913ef160eee0ebd9b0341d37c77320566af1ee7fe6db5fb0c0e42e03e2396bed9654f64284fb446e00fff9b2c3584
SSDEEP 3072:6MXEBvn/f6cDbLbA9OtazjB8n5ohA1sMrbV1pA8OloDDSuOW082m4FwCpjKpEAHc:DK/f6cXL9tazjB8dt3V1VDD68nEmQLr
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
Creates new service(s) 1 TTPs
persistence

New Service
T1050

Executes dropped EXE 1 IoCs

pid	Process
1816	hoostdny.exe

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
1368	netsh.exe

Launches sc.exe 3 IoCs

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

pid	Process
1004	sc.exe
1928	sc.exe
1784	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 28 IoCs

description	pid	Process	procid_target
PID 1632 wrote to memory of 1492	1632	file.exe	27
PID 1632 wrote to memory of 1492	1632	file.exe	27
PID 1632 wrote to memory of 1492	1632	file.exe	27
PID 1632 wrote to memory of 1492	1632	file.exe	27
PID 1632 wrote to memory of 1028	1632	file.exe	29
PID 1632 wrote to memory of 1028	1632	file.exe	29
PID 1632 wrote to memory of 1028	1632	file.exe	29
PID 1632 wrote to memory of 1028	1632	file.exe	29
PID 1632 wrote to memory of 1004	1632	file.exe	31
PID 1632 wrote to memory of 1004	1632	file.exe	31
PID 1632 wrote to memory of 1004	1632	file.exe	31
PID 1632 wrote to memory of 1004	1632	file.exe	31
PID 1632 wrote to memory of 1928	1632	file.exe	33
PID 1632 wrote to memory of 1928	1632	file.exe	33
PID 1632 wrote to memory of 1928	1632	file.exe	33
PID 1632 wrote to memory of 1928	1632	file.exe	33
PID 1632 wrote to memory of 1784	1632	file.exe	35
PID 1632 wrote to memory of 1784	1632	file.exe	35
PID 1632 wrote to memory of 1784	1632	file.exe	35
PID 1632 wrote to memory of 1784	1632	file.exe	35
PID 1632 wrote to memory of 1368	1632	file.exe	38
PID 1632 wrote to memory of 1368	1632	file.exe	38
PID 1632 wrote to memory of 1368	1632	file.exe	38
PID 1632 wrote to memory of 1368	1632	file.exe	38
PID 1816 wrote to memory of 316	1816	hoostdny.exe	40
PID 1816 wrote to memory of 316	1816	hoostdny.exe	40
PID 1816 wrote to memory of 316	1816	hoostdny.exe	40
PID 1816 wrote to memory of 316	1816	hoostdny.exe	40

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1632
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hgiyidcu\
  2⤵
  PID:1492
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\hoostdny.exe" C:\Windows\SysWOW64\hgiyidcu\
  2⤵
  PID:1028
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create hgiyidcu binPath= "C:\Windows\SysWOW64\hgiyidcu\hoostdny.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:1004
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description hgiyidcu "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:1928
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start hgiyidcu
  2⤵
  - Launches sc.exe
  PID:1784
- 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:1368

C:\Windows\SysWOW64\hgiyidcu\hoostdny.exe
C:\Windows\SysWOW64\hgiyidcu\hoostdny.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:1816
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  PID:316

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Modify Existing Service

T1031

New Service

T1050

Privilege Escalation

New Service

T1050

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

hoostdny.exe

Path C:\Users\Admin\AppData\Local\Temp\hoostdny.exe
Size 10.8MB
SHA256 5553b3abee9919ca99306d84d0c83cc35a25e7494924d01f0117496266adef1f
MD5 e6e602e7fd8c45fc566332904b91bb17
SHA1 874b7f07b16b81e1d19c6f11c4e053e5552e6951
SHA512 033b7ce8808439cd645012386ca2218fd6fc41e2989d5998fe8855e694d6751d6a201d90b844dad89cc6b2375c0a2725fd62b7cdfdcfb47a972f190cba9d32d1
SSDEEP 196608:VJjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjX:
MD5 SHA1 SHA512 SSDEEP

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hoostdny.exe

Path C:\Windows\SysWOW64\hgiyidcu\hoostdny.exe
Size 10.8MB
SHA256 5553b3abee9919ca99306d84d0c83cc35a25e7494924d01f0117496266adef1f
MD5 e6e602e7fd8c45fc566332904b91bb17
SHA1 874b7f07b16b81e1d19c6f11c4e053e5552e6951
SHA512 033b7ce8808439cd645012386ca2218fd6fc41e2989d5998fe8855e694d6751d6a201d90b844dad89cc6b2375c0a2725fd62b7cdfdcfb47a972f190cba9d32d1
SSDEEP 196608:VJjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjX:
MD5 SHA1 SHA512 SSDEEP

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memory/316-70-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/1632-66-0x0000000002C5D000-0x0000000002C6E000-memory.dmp

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memory/1632-59-0x0000000000400000-0x0000000002BAE000-memory.dmp

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memory/1632-56-0x0000000002C5D000-0x0000000002C6E000-memory.dmp

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memory/1632-54-0x00000000761F1000-0x00000000761F3000-memory.dmp

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memory/1632-67-0x0000000000400000-0x0000000002BAE000-memory.dmp

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memory/1632-57-0x0000000000220000-0x0000000000233000-memory.dmp

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memory/1816-72-0x000000000300D000-0x000000000301E000-memory.dmp

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memory/1816-73-0x0000000000400000-0x0000000002BAE000-memory.dmp

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Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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