tofsee | efec07fbc1d3df82dc8f39c152f8d74da43ce2df373166952c9a1db3abf4135f

Analysis

max time kernel
149s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
09/01/2023, 06:07

Sharing

Copy URL Twitter E-mail

Report Analysis Logs

General

Target
file.exe
Size 354KB
Sample230109-gvbgeadb77
SHA256 efec07fbc1d3df82dc8f39c152f8d74da43ce2df373166952c9a1db3abf4135f
MD5 2e40b706f95e6b545a19a7cb3b7f4e35
SHA1 7d5f3f05c5b9f16b972a5af6bbb0d80af0b7d5b2
SHA512 2634757e7376e5a3ff990ec970153f77228772c9fab566a8583ac9b2877d307fa0df91a263ed3e6d34a6f0011ab821da47bcb0a1bb386dc08679c14247840554
SSDEEP 6144:pWy8FsrlLDhLogHj30Kv1Yb1FVMWRFCFuedbe++g:pWy8i53hLogrj1cFtt++g
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
532	tfocbxgl.exe

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
680	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\bxosjkmt\ImagePath = "C:\\Windows\\SysWOW64\\bxosjkmt\\tfocbxgl.exe"	svchost.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Control Panel\International\Geo\Nation	file.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 532 set thread context of 2488	532	tfocbxgl.exe	103

Launches sc.exe 3 IoCs

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

pid	Process
376	sc.exe
2104	sc.exe
3448	sc.exe

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

System Information Discovery
T1082

Program crash 2 IoCs

pid	pid_target	Process	procid_target
1328	5060	WerFault.exe	81
1964	532	WerFault.exe	96

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 5060 wrote to memory of 2912	5060	file.exe	85
PID 5060 wrote to memory of 2912	5060	file.exe	85
PID 5060 wrote to memory of 2912	5060	file.exe	85
PID 5060 wrote to memory of 2580	5060	file.exe	87
PID 5060 wrote to memory of 2580	5060	file.exe	87
PID 5060 wrote to memory of 2580	5060	file.exe	87
PID 5060 wrote to memory of 3448	5060	file.exe	89
PID 5060 wrote to memory of 3448	5060	file.exe	89
PID 5060 wrote to memory of 3448	5060	file.exe	89
PID 5060 wrote to memory of 376	5060	file.exe	91
PID 5060 wrote to memory of 376	5060	file.exe	91
PID 5060 wrote to memory of 376	5060	file.exe	91
PID 5060 wrote to memory of 2104	5060	file.exe	94
PID 5060 wrote to memory of 2104	5060	file.exe	94
PID 5060 wrote to memory of 2104	5060	file.exe	94
PID 5060 wrote to memory of 680	5060	file.exe	97
PID 5060 wrote to memory of 680	5060	file.exe	97
PID 5060 wrote to memory of 680	5060	file.exe	97
PID 532 wrote to memory of 2488	532	tfocbxgl.exe	103
PID 532 wrote to memory of 2488	532	tfocbxgl.exe	103
PID 532 wrote to memory of 2488	532	tfocbxgl.exe	103
PID 532 wrote to memory of 2488	532	tfocbxgl.exe	103
PID 532 wrote to memory of 2488	532	tfocbxgl.exe	103

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:5060
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\bxosjkmt\
  2⤵
  PID:2912
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\tfocbxgl.exe" C:\Windows\SysWOW64\bxosjkmt\
  2⤵
  PID:2580
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create bxosjkmt binPath= "C:\Windows\SysWOW64\bxosjkmt\tfocbxgl.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:3448
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description bxosjkmt "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:376
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start bxosjkmt
  2⤵
  - Launches sc.exe
  PID:2104
- 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:680
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 5060 -s 1044
  2⤵
  - Program crash
  PID:1328

C:\Windows\SysWOW64\bxosjkmt\tfocbxgl.exe
C:\Windows\SysWOW64\bxosjkmt\tfocbxgl.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:532
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  PID:2488
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 532 -s 516
  2⤵
  - Program crash
  PID:1964

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 5060 -ip 5060
1⤵
PID:1864

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 544 -p 532 -ip 532
1⤵
PID:1972

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

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

tfocbxgl.exe

Path C:\Users\Admin\AppData\Local\Temp\tfocbxgl.exe
Size 13.8MB
SHA256 9dfd9f7fb40e33f6977e28476105b6065c218d924f0df6e6aac7a1e4d5d1af67
MD5 296a9fb84c6300d3df8d14aec20f43cf
SHA1 1cd38550ea2420a3b75087467e116d4da4b7d9a1
SHA512 03cba56ba8f80ccc32d2514bcc50675f84525d0ed3b1b989388682efbfa3ac0035c23e6d43586a494d70f9a3f6ec3befd92fa7892e186e22c2e27f0ac39a318b
SSDEEP 6144:hWy8FsrlLDhLogHj30Kv1Yb1FVMWRFCFuedbe++g:hWy8i53hLogrj1cFtt++g
MD5 SHA1 SHA512 SSDEEP

Submit Download

tfocbxgl.exe

Path C:\Windows\SysWOW64\bxosjkmt\tfocbxgl.exe
Size 13.8MB
SHA256 9dfd9f7fb40e33f6977e28476105b6065c218d924f0df6e6aac7a1e4d5d1af67
MD5 296a9fb84c6300d3df8d14aec20f43cf
SHA1 1cd38550ea2420a3b75087467e116d4da4b7d9a1
SHA512 03cba56ba8f80ccc32d2514bcc50675f84525d0ed3b1b989388682efbfa3ac0035c23e6d43586a494d70f9a3f6ec3befd92fa7892e186e22c2e27f0ac39a318b
SSDEEP 6144:hWy8FsrlLDhLogHj30Kv1Yb1FVMWRFCFuedbe++g:hWy8i53hLogrj1cFtt++g
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/532-151-0x0000000000400000-0x000000000301B000-memory.dmp

Download

memory/532-149-0x0000000003259000-0x000000000326E000-memory.dmp

Download

memory/2488-152-0x0000000001260000-0x0000000001275000-memory.dmp

Download

memory/2488-150-0x0000000001260000-0x0000000001275000-memory.dmp

Download

memory/2488-146-0x0000000001260000-0x0000000001275000-memory.dmp

Download

memory/5060-144-0x0000000000400000-0x000000000301B000-memory.dmp

Download

memory/5060-143-0x000000000322D000-0x0000000003243000-memory.dmp

Download

memory/5060-132-0x000000000322D000-0x0000000003243000-memory.dmp

Download

memory/5060-134-0x0000000000400000-0x000000000301B000-memory.dmp

Download

memory/5060-133-0x0000000003160000-0x0000000003173000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

Loading Replay Monitor...

Downloads