tofsee | 72ddf1a00d4705c99c0d26668d6af55071dcddeb9c4da47f87e5c69dc1ef3e19

Analysis

max time kernel
166s
max time network
168s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
02/12/2022, 10:10

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General

Target
file.exe
Size 350KB
Sample221202-l7ertaba8s
SHA256 72ddf1a00d4705c99c0d26668d6af55071dcddeb9c4da47f87e5c69dc1ef3e19
MD5 e6c5a231ec3235d5020f4af44ee5f2b8
SHA1 ae7aeaf37397c4adf15eb839f3a69b0b64444e9f
SHA512 367668d17178bb47ab49afdd7d9ff73682cca7872920e587592f739b55805f056b3f93613bff6d359f84f4c0d18c6bc9ac461d30998dce865130ebec50380692
SSDEEP 6144:KHXLG/6QDZw2FGxTKrzXR8+zqrWuRjMgU:K3S/DK2sYzXR8/RQg
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\nhnhoikc = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050

Executes dropped EXE 1 IoCs

pid	Process
1892	ihghisux.exe

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
428	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\nhnhoikc\ImagePath = "C:\\Windows\\SysWOW64\\nhnhoikc\\ihghisux.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
592	svchost.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1892 set thread context of 592	1892	ihghisux.exe	40

Launches sc.exe 3 IoCs

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

pid	Process
1288	sc.exe
2036	sc.exe
736	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 892 wrote to memory of 1236	892	file.exe	27
PID 892 wrote to memory of 1236	892	file.exe	27
PID 892 wrote to memory of 1236	892	file.exe	27
PID 892 wrote to memory of 1236	892	file.exe	27
PID 892 wrote to memory of 1420	892	file.exe	29
PID 892 wrote to memory of 1420	892	file.exe	29
PID 892 wrote to memory of 1420	892	file.exe	29
PID 892 wrote to memory of 1420	892	file.exe	29
PID 892 wrote to memory of 1288	892	file.exe	31
PID 892 wrote to memory of 1288	892	file.exe	31
PID 892 wrote to memory of 1288	892	file.exe	31
PID 892 wrote to memory of 1288	892	file.exe	31
PID 892 wrote to memory of 2036	892	file.exe	33
PID 892 wrote to memory of 2036	892	file.exe	33
PID 892 wrote to memory of 2036	892	file.exe	33
PID 892 wrote to memory of 2036	892	file.exe	33
PID 892 wrote to memory of 736	892	file.exe	35
PID 892 wrote to memory of 736	892	file.exe	35
PID 892 wrote to memory of 736	892	file.exe	35
PID 892 wrote to memory of 736	892	file.exe	35
PID 892 wrote to memory of 428	892	file.exe	38
PID 892 wrote to memory of 428	892	file.exe	38
PID 892 wrote to memory of 428	892	file.exe	38
PID 892 wrote to memory of 428	892	file.exe	38
PID 1892 wrote to memory of 592	1892	ihghisux.exe	40
PID 1892 wrote to memory of 592	1892	ihghisux.exe	40
PID 1892 wrote to memory of 592	1892	ihghisux.exe	40
PID 1892 wrote to memory of 592	1892	ihghisux.exe	40
PID 1892 wrote to memory of 592	1892	ihghisux.exe	40
PID 1892 wrote to memory of 592	1892	ihghisux.exe	40

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:892
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\nhnhoikc\
  2⤵
  PID:1236
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ihghisux.exe" C:\Windows\SysWOW64\nhnhoikc\
  2⤵
  PID:1420
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create nhnhoikc binPath= "C:\Windows\SysWOW64\nhnhoikc\ihghisux.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:1288
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description nhnhoikc "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2036
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start nhnhoikc
  2⤵
  - Launches sc.exe
  PID:736
- 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:428

C:\Windows\SysWOW64\nhnhoikc\ihghisux.exe
C:\Windows\SysWOW64\nhnhoikc\ihghisux.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1892
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  PID:592

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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ihghisux.exe

Path C:\Users\Admin\AppData\Local\Temp\ihghisux.exe
Size 13.7MB
SHA256 9d8050efe82922e8c737832814c6771c949a0b80936b4479640526083638b903
MD5 d1d47983cfa48dfee16d6b569b454d6f
SHA1 f64ae2a053ee34631e7c6b9a20dcec4579867734
SHA512 b96eddf213d520c5437b7a6a0f978473aefa90ce2b9f5f817f5a07d34476b253d38711c6e9b8065e7c070d3d62d5b381a590d0847e6b793784bb5c211ebda61c
SSDEEP 6144:tHXLG/6QDZw2FGxTKrzXR8+zqrWuRjMgU:t3S/DK2sYzXR8/RQg
MD5 SHA1 SHA512 SSDEEP

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ihghisux.exe

Path C:\Windows\SysWOW64\nhnhoikc\ihghisux.exe
Size 13.7MB
SHA256 9d8050efe82922e8c737832814c6771c949a0b80936b4479640526083638b903
MD5 d1d47983cfa48dfee16d6b569b454d6f
SHA1 f64ae2a053ee34631e7c6b9a20dcec4579867734
SHA512 b96eddf213d520c5437b7a6a0f978473aefa90ce2b9f5f817f5a07d34476b253d38711c6e9b8065e7c070d3d62d5b381a590d0847e6b793784bb5c211ebda61c
SSDEEP 6144:tHXLG/6QDZw2FGxTKrzXR8+zqrWuRjMgU:t3S/DK2sYzXR8/RQg
MD5 SHA1 SHA512 SSDEEP

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memory/592-72-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/592-80-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/592-79-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/592-70-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/892-66-0x000000000061A000-0x000000000062F000-memory.dmp

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memory/892-57-0x0000000000020000-0x0000000000033000-memory.dmp

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memory/892-56-0x000000000061A000-0x000000000062F000-memory.dmp

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memory/892-67-0x0000000000400000-0x000000000045D000-memory.dmp

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memory/892-54-0x0000000075141000-0x0000000075143000-memory.dmp

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memory/892-58-0x0000000000400000-0x000000000045D000-memory.dmp

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memory/1892-76-0x000000000056A000-0x000000000057F000-memory.dmp

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memory/1892-77-0x0000000000400000-0x000000000045D000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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