tofsee | dae33d38f40bc387c3decf2d8388795f5aaae213062181806c8a6a94d4e31409

Analysis

max time kernel
150s
max time network
207s
platform
windows7_x64
resource
win7-20221111-en
resource tags

arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
submitted
10/02/2023, 11:30

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General

Target
file.exe
Size 357KB
Sample230210-nl6draea85
SHA256 dae33d38f40bc387c3decf2d8388795f5aaae213062181806c8a6a94d4e31409
MD5 f35b1bf55afb2ec8d9e13a8f15e21d89
SHA1 5aa7bf6e603321edb6e6fd244fabc6e9b195de0b
SHA512 761768e1ca5895ad8b25e7050e857f254b32b31bbb163e10f91dba5a0b6ae6819d47ab970947f348b8f62953cb5925102d46145ae95a595db7f92fa99174d0ff
SSDEEP 3072:ZwCbieK9GBaH91u4+R6hNOruBFYI4TzCVA8KmuyTlfdU2cZpx9nf6NAI2UUU/:aKG8adVhr/Y+VA8K65JcZVnfWfT/
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\mkdedere = "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
1884	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\mkdedere\ImagePath = "C:\\Windows\\SysWOW64\\mkdedere\\ifzaxfvc.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
1736	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
1180	ifzaxfvc.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1180 set thread context of 1736	1180	ifzaxfvc.exe	41

Launches sc.exe 3 IoCs

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

pid	Process
1332	sc.exe
1640	sc.exe
604	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 1392 wrote to memory of 832	1392	file.exe	28
PID 1392 wrote to memory of 832	1392	file.exe	28
PID 1392 wrote to memory of 832	1392	file.exe	28
PID 1392 wrote to memory of 832	1392	file.exe	28
PID 1392 wrote to memory of 1480	1392	file.exe	30
PID 1392 wrote to memory of 1480	1392	file.exe	30
PID 1392 wrote to memory of 1480	1392	file.exe	30
PID 1392 wrote to memory of 1480	1392	file.exe	30
PID 1392 wrote to memory of 1332	1392	file.exe	32
PID 1392 wrote to memory of 1332	1392	file.exe	32
PID 1392 wrote to memory of 1332	1392	file.exe	32
PID 1392 wrote to memory of 1332	1392	file.exe	32
PID 1392 wrote to memory of 1640	1392	file.exe	34
PID 1392 wrote to memory of 1640	1392	file.exe	34
PID 1392 wrote to memory of 1640	1392	file.exe	34
PID 1392 wrote to memory of 1640	1392	file.exe	34
PID 1392 wrote to memory of 604	1392	file.exe	36
PID 1392 wrote to memory of 604	1392	file.exe	36
PID 1392 wrote to memory of 604	1392	file.exe	36
PID 1392 wrote to memory of 604	1392	file.exe	36
PID 1392 wrote to memory of 1884	1392	file.exe	38
PID 1392 wrote to memory of 1884	1392	file.exe	38
PID 1392 wrote to memory of 1884	1392	file.exe	38
PID 1392 wrote to memory of 1884	1392	file.exe	38
PID 1180 wrote to memory of 1736	1180	ifzaxfvc.exe	41
PID 1180 wrote to memory of 1736	1180	ifzaxfvc.exe	41
PID 1180 wrote to memory of 1736	1180	ifzaxfvc.exe	41
PID 1180 wrote to memory of 1736	1180	ifzaxfvc.exe	41
PID 1180 wrote to memory of 1736	1180	ifzaxfvc.exe	41
PID 1180 wrote to memory of 1736	1180	ifzaxfvc.exe	41

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1392
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\mkdedere\
  2⤵
  PID:832
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ifzaxfvc.exe" C:\Windows\SysWOW64\mkdedere\
  2⤵
  PID:1480
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create mkdedere binPath= "C:\Windows\SysWOW64\mkdedere\ifzaxfvc.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:1332
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description mkdedere "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:1640
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start mkdedere
  2⤵
  - Launches sc.exe
  PID:604
- 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:1884

C:\Windows\SysWOW64\mkdedere\ifzaxfvc.exe
C:\Windows\SysWOW64\mkdedere\ifzaxfvc.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1180
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  PID:1736

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

ifzaxfvc.exe

Path C:\Users\Admin\AppData\Local\Temp\ifzaxfvc.exe
Size 11.2MB
SHA256 43ae908978eef14f1ea4b3a1d48866e41ba1069eb4160227c751c00ca1e35afa
MD5 a29c44a5df88ee7077953247cb0dd10b
SHA1 7c072d744f90d887b5ededa22353b7b53f6a8e96
SHA512 57bf96deadd83fc3ea5e944c7c0274b0388489bd695910a58ce6ea727edc0f5c3e4cc04f5a86afd9c4a571f1e9a3f824bf9f2d8c3ac58f9546513f44ad2e8798
SSDEEP 49152:LmKwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww3:y
MD5 SHA1 SHA512 SSDEEP

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ifzaxfvc.exe

Path C:\Windows\SysWOW64\mkdedere\ifzaxfvc.exe
Size 11.2MB
SHA256 43ae908978eef14f1ea4b3a1d48866e41ba1069eb4160227c751c00ca1e35afa
MD5 a29c44a5df88ee7077953247cb0dd10b
SHA1 7c072d744f90d887b5ededa22353b7b53f6a8e96
SHA512 57bf96deadd83fc3ea5e944c7c0274b0388489bd695910a58ce6ea727edc0f5c3e4cc04f5a86afd9c4a571f1e9a3f824bf9f2d8c3ac58f9546513f44ad2e8798
SSDEEP 49152:LmKwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww3:y
MD5 SHA1 SHA512 SSDEEP

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memory/1180-78-0x0000000000400000-0x0000000000485000-memory.dmp

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memory/1180-75-0x000000000054D000-0x0000000000563000-memory.dmp

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memory/1392-57-0x0000000000230000-0x0000000000243000-memory.dmp

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memory/1392-58-0x0000000000400000-0x0000000000485000-memory.dmp

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memory/1392-54-0x0000000075BE1000-0x0000000075BE3000-memory.dmp

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memory/1392-56-0x00000000005CD000-0x00000000005E3000-memory.dmp

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memory/1392-64-0x00000000005CD000-0x00000000005E3000-memory.dmp

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memory/1392-66-0x00000000005CD000-0x00000000005E3000-memory.dmp

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memory/1392-67-0x0000000000400000-0x0000000000485000-memory.dmp

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memory/1736-71-0x00000000000D0000-0x00000000000E5000-memory.dmp

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memory/1736-73-0x00000000000D0000-0x00000000000E5000-memory.dmp

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memory/1736-80-0x00000000000D0000-0x00000000000E5000-memory.dmp

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memory/1736-81-0x00000000000D0000-0x00000000000E5000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads