tofsee | c841cb96a9a0648f1d9df6b16c244bc1e80aca79eebd77e733c2c33ddcef5e1a

Analysis

max time kernel
146s
max time network
141s
platform
windows7_x64
resource
win7-20220901-en
resource tags

arch:x64arch:x86image:win7-20220901-enlocale:en-usos:windows7-x64system
submitted
26/11/2022, 04:28

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General

Target
file.exe
Size 147KB
Sample221126-e3netsfc3s
SHA256 c841cb96a9a0648f1d9df6b16c244bc1e80aca79eebd77e733c2c33ddcef5e1a
MD5 1eb05ec5bc5982ebc88aa1ad6b69fb46
SHA1 fcfc2f0c0f5cc446961959165b6dc01b29b23701
SHA512 c591a73be6073da3ee9a2f80336ba386c31c9f5f08332d5b8a6ec959bb8a6cc929dae51309832c648af44c69e712082f930e11ae3324a528bcfe5ff1265bb9f6
SSDEEP 3072:fkJxzH6d2wC065TLWslukoo1Cl7U8onB:f4i2wklukooS7U8
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\mgzpyqyf = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050

Executes dropped EXE 1 IoCs

pid	Process
1768	gmzunuhc.exe

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
1676	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\mgzpyqyf\ImagePath = "C:\\Windows\\SysWOW64\\mgzpyqyf\\gmzunuhc.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
868	svchost.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1768 set thread context of 868	1768	gmzunuhc.exe	39

Launches sc.exe 3 IoCs

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

pid	Process
1376	sc.exe
864	sc.exe
320	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 1456 wrote to memory of 1472	1456	file.exe	26
PID 1456 wrote to memory of 1472	1456	file.exe	26
PID 1456 wrote to memory of 1472	1456	file.exe	26
PID 1456 wrote to memory of 1472	1456	file.exe	26
PID 1456 wrote to memory of 1680	1456	file.exe	28
PID 1456 wrote to memory of 1680	1456	file.exe	28
PID 1456 wrote to memory of 1680	1456	file.exe	28
PID 1456 wrote to memory of 1680	1456	file.exe	28
PID 1456 wrote to memory of 1376	1456	file.exe	30
PID 1456 wrote to memory of 1376	1456	file.exe	30
PID 1456 wrote to memory of 1376	1456	file.exe	30
PID 1456 wrote to memory of 1376	1456	file.exe	30
PID 1456 wrote to memory of 864	1456	file.exe	32
PID 1456 wrote to memory of 864	1456	file.exe	32
PID 1456 wrote to memory of 864	1456	file.exe	32
PID 1456 wrote to memory of 864	1456	file.exe	32
PID 1456 wrote to memory of 320	1456	file.exe	34
PID 1456 wrote to memory of 320	1456	file.exe	34
PID 1456 wrote to memory of 320	1456	file.exe	34
PID 1456 wrote to memory of 320	1456	file.exe	34
PID 1456 wrote to memory of 1676	1456	file.exe	37
PID 1456 wrote to memory of 1676	1456	file.exe	37
PID 1456 wrote to memory of 1676	1456	file.exe	37
PID 1456 wrote to memory of 1676	1456	file.exe	37
PID 1768 wrote to memory of 868	1768	gmzunuhc.exe	39
PID 1768 wrote to memory of 868	1768	gmzunuhc.exe	39
PID 1768 wrote to memory of 868	1768	gmzunuhc.exe	39
PID 1768 wrote to memory of 868	1768	gmzunuhc.exe	39
PID 1768 wrote to memory of 868	1768	gmzunuhc.exe	39
PID 1768 wrote to memory of 868	1768	gmzunuhc.exe	39

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1456
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\mgzpyqyf\
  2⤵
  PID:1472
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\gmzunuhc.exe" C:\Windows\SysWOW64\mgzpyqyf\
  2⤵
  PID:1680
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create mgzpyqyf binPath= "C:\Windows\SysWOW64\mgzpyqyf\gmzunuhc.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:1376
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description mgzpyqyf "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:864
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start mgzpyqyf
  2⤵
  - Launches sc.exe
  PID:320
- 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:1676

C:\Windows\SysWOW64\mgzpyqyf\gmzunuhc.exe
C:\Windows\SysWOW64\mgzpyqyf\gmzunuhc.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:868

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

gmzunuhc.exe

Path C:\Users\Admin\AppData\Local\Temp\gmzunuhc.exe
Size 12.2MB
SHA256 4495eb5b7a9e933c5b8df6f61c5523ad28226cda55e7533f1d9e6c8910ae9647
MD5 81a37510b37604c7d6de430f4de2f88e
SHA1 8957d17d99a60f195bb011fe6c0661661de23c05
SHA512 6c4c14be74fb532e0a8dfb37e816f47aee1e8a6346db6f98b6d09b3a31e29041431b183aac7d74a6ef9f3d826aa6c0951cf629e01f014c5025b3ffa044870767
SSDEEP 6144:L4i2wklukooS7U8UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU4:L4s6utv
MD5 SHA1 SHA512 SSDEEP

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gmzunuhc.exe

Path C:\Windows\SysWOW64\mgzpyqyf\gmzunuhc.exe
Size 12.2MB
SHA256 4495eb5b7a9e933c5b8df6f61c5523ad28226cda55e7533f1d9e6c8910ae9647
MD5 81a37510b37604c7d6de430f4de2f88e
SHA1 8957d17d99a60f195bb011fe6c0661661de23c05
SHA512 6c4c14be74fb532e0a8dfb37e816f47aee1e8a6346db6f98b6d09b3a31e29041431b183aac7d74a6ef9f3d826aa6c0951cf629e01f014c5025b3ffa044870767
SSDEEP 6144:L4i2wklukooS7U8UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU4:L4s6utv
MD5 SHA1 SHA512 SSDEEP

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memory/868-70-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/868-80-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/868-79-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/868-72-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/1456-58-0x00000000003A0000-0x00000000003B3000-memory.dmp

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memory/1456-67-0x0000000000400000-0x0000000000AD6000-memory.dmp

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memory/1456-57-0x0000000000230000-0x0000000000330000-memory.dmp

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memory/1456-55-0x0000000075B51000-0x0000000075B53000-memory.dmp

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memory/1456-59-0x0000000000400000-0x0000000000AD6000-memory.dmp

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memory/1768-76-0x0000000000BBB000-0x0000000000BCB000-memory.dmp

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memory/1768-78-0x0000000000400000-0x0000000000AD6000-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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