tofsee | ef514682a7ab092326100883aa5a4101cb49a2054f538e3731d80c19e065f016

Analysis

max time kernel
149s
max time network
143s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
02/12/2022, 10:51

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General

Target
file.exe
Size 350KB
Sample221202-mxvkysdg7z
SHA256 ef514682a7ab092326100883aa5a4101cb49a2054f538e3731d80c19e065f016
MD5 64b84c266e164427f5ff999f0852817c
SHA1 2ac627bc23ec6669c2d8a95f6c3f35c6e1e753a9
SHA512 f1e36be5e459c71eef8c3880d3cb905bf7f4f909fe00bafb255b45e89b1657cbb3cb6596ffe91751fe690dd7d1923ad8884a4198813ce4a0253ea4025c9ff69b
SSDEEP 6144:Y825LbuPCD71fzEEtPBYNd2LNDRyjkuRjMgU:Y7nuKRlRKd2RDA1RQg
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\ugdcnrio = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050

Executes dropped EXE 1 IoCs

pid	Process
580	jgabygwd.exe

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
520	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\ugdcnrio\ImagePath = "C:\\Windows\\SysWOW64\\ugdcnrio\\jgabygwd.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
1468	svchost.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 580 set thread context of 1468	580	jgabygwd.exe	40

Launches sc.exe 3 IoCs

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

pid	Process
1828	sc.exe
1340	sc.exe
1824	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 1668 wrote to memory of 1348	1668	file.exe	27
PID 1668 wrote to memory of 1348	1668	file.exe	27
PID 1668 wrote to memory of 1348	1668	file.exe	27
PID 1668 wrote to memory of 1348	1668	file.exe	27
PID 1668 wrote to memory of 1840	1668	file.exe	29
PID 1668 wrote to memory of 1840	1668	file.exe	29
PID 1668 wrote to memory of 1840	1668	file.exe	29
PID 1668 wrote to memory of 1840	1668	file.exe	29
PID 1668 wrote to memory of 1828	1668	file.exe	31
PID 1668 wrote to memory of 1828	1668	file.exe	31
PID 1668 wrote to memory of 1828	1668	file.exe	31
PID 1668 wrote to memory of 1828	1668	file.exe	31
PID 1668 wrote to memory of 1340	1668	file.exe	33
PID 1668 wrote to memory of 1340	1668	file.exe	33
PID 1668 wrote to memory of 1340	1668	file.exe	33
PID 1668 wrote to memory of 1340	1668	file.exe	33
PID 1668 wrote to memory of 1824	1668	file.exe	35
PID 1668 wrote to memory of 1824	1668	file.exe	35
PID 1668 wrote to memory of 1824	1668	file.exe	35
PID 1668 wrote to memory of 1824	1668	file.exe	35
PID 1668 wrote to memory of 520	1668	file.exe	38
PID 1668 wrote to memory of 520	1668	file.exe	38
PID 1668 wrote to memory of 520	1668	file.exe	38
PID 1668 wrote to memory of 520	1668	file.exe	38
PID 580 wrote to memory of 1468	580	jgabygwd.exe	40
PID 580 wrote to memory of 1468	580	jgabygwd.exe	40
PID 580 wrote to memory of 1468	580	jgabygwd.exe	40
PID 580 wrote to memory of 1468	580	jgabygwd.exe	40
PID 580 wrote to memory of 1468	580	jgabygwd.exe	40
PID 580 wrote to memory of 1468	580	jgabygwd.exe	40

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1668
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ugdcnrio\
  2⤵
  PID:1348
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\jgabygwd.exe" C:\Windows\SysWOW64\ugdcnrio\
  2⤵
  PID:1840
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create ugdcnrio binPath= "C:\Windows\SysWOW64\ugdcnrio\jgabygwd.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:1828
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description ugdcnrio "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:1340
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start ugdcnrio
  2⤵
  - Launches sc.exe
  PID:1824
- 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:520

C:\Windows\SysWOW64\ugdcnrio\jgabygwd.exe
C:\Windows\SysWOW64\ugdcnrio\jgabygwd.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:580
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  PID:1468

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

jgabygwd.exe

Path C:\Users\Admin\AppData\Local\Temp\jgabygwd.exe
Size 14.0MB
SHA256 a9b2c3d538bce40f036a33b369b59df69d23b29d3448dadcdafb5bdc7d975ea7
MD5 dba0612823bbf6f8e9192e0e2c5b7928
SHA1 be50987f212a315cc30622943d40cdc3558e8eb9
SHA512 8a65fbbf0b8f10ac1bae59d075053ea1872a6199291506e75f440aea2e7cd6b6b1039f17b95c93d98581dcd5b1d7c3fe957eef613f2874565275be65559e2ad3
SSDEEP 6144:i825LbuPCD71fzEEtPBYNd2LNDRyjkuRjMgU:i7nuKRlRKd2RDA1RQg
MD5 SHA1 SHA512 SSDEEP

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jgabygwd.exe

Path C:\Windows\SysWOW64\ugdcnrio\jgabygwd.exe
Size 14.0MB
SHA256 a9b2c3d538bce40f036a33b369b59df69d23b29d3448dadcdafb5bdc7d975ea7
MD5 dba0612823bbf6f8e9192e0e2c5b7928
SHA1 be50987f212a315cc30622943d40cdc3558e8eb9
SHA512 8a65fbbf0b8f10ac1bae59d075053ea1872a6199291506e75f440aea2e7cd6b6b1039f17b95c93d98581dcd5b1d7c3fe957eef613f2874565275be65559e2ad3
SSDEEP 6144:i825LbuPCD71fzEEtPBYNd2LNDRyjkuRjMgU:i7nuKRlRKd2RDA1RQg
MD5 SHA1 SHA512 SSDEEP

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memory/580-74-0x000000000050A000-0x000000000051F000-memory.dmp

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memory/580-76-0x0000000000400000-0x000000000045D000-memory.dmp

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memory/1468-72-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/1468-70-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/1468-80-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/1468-79-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/1668-57-0x0000000000400000-0x000000000045D000-memory.dmp

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memory/1668-67-0x0000000000400000-0x000000000045D000-memory.dmp

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memory/1668-66-0x000000000026A000-0x000000000027F000-memory.dmp

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memory/1668-54-0x0000000075071000-0x0000000075073000-memory.dmp

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memory/1668-56-0x00000000003C0000-0x00000000003D3000-memory.dmp

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memory/1668-55-0x000000000026A000-0x000000000027F000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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