tofsee | 4578fdf4e3475492d84809f602c1fef596cb4f6052343bc04c2f615bf69a6576

Analysis

max time kernel
148s
max time network
158s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
10/02/2023, 03:37

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General

Target
file.exe
Size 194KB
Sample230210-d6gwsabe4z
SHA256 4578fdf4e3475492d84809f602c1fef596cb4f6052343bc04c2f615bf69a6576
MD5 8dbb2de2e2c954965387aac3ea23b4a7
SHA1 f22b640b505d388410bd42d85e28b996ccd3082c
SHA512 ec8faf56458b873fad64c320e829df21a73d54161997811649616bacac9c78a96648c6a820ef96d2333eb3379d060609dbc6214d3592ea951c8f946ea4166746
SSDEEP 3072:jEmvMBzOl9EyRjf4wwAp2BydibhbX/GeL6SjcDfvPbHcsC7ArBlq3:4mEBKJRL4wwo2BykPX6McDf7cB7ArB
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\tuzpepgr = "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
320	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\tuzpepgr\ImagePath = "C:\\Windows\\SysWOW64\\tuzpepgr\\aqwdiuyn.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
1280	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
860	aqwdiuyn.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 860 set thread context of 1280	860	aqwdiuyn.exe	39

Launches sc.exe 3 IoCs

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

pid	Process
2016	sc.exe
2012	sc.exe
1740	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 1880 wrote to memory of 1200	1880	file.exe	26
PID 1880 wrote to memory of 1200	1880	file.exe	26
PID 1880 wrote to memory of 1200	1880	file.exe	26
PID 1880 wrote to memory of 1200	1880	file.exe	26
PID 1880 wrote to memory of 1088	1880	file.exe	28
PID 1880 wrote to memory of 1088	1880	file.exe	28
PID 1880 wrote to memory of 1088	1880	file.exe	28
PID 1880 wrote to memory of 1088	1880	file.exe	28
PID 1880 wrote to memory of 2016	1880	file.exe	30
PID 1880 wrote to memory of 2016	1880	file.exe	30
PID 1880 wrote to memory of 2016	1880	file.exe	30
PID 1880 wrote to memory of 2016	1880	file.exe	30
PID 1880 wrote to memory of 2012	1880	file.exe	32
PID 1880 wrote to memory of 2012	1880	file.exe	32
PID 1880 wrote to memory of 2012	1880	file.exe	32
PID 1880 wrote to memory of 2012	1880	file.exe	32
PID 1880 wrote to memory of 1740	1880	file.exe	34
PID 1880 wrote to memory of 1740	1880	file.exe	34
PID 1880 wrote to memory of 1740	1880	file.exe	34
PID 1880 wrote to memory of 1740	1880	file.exe	34
PID 1880 wrote to memory of 320	1880	file.exe	37
PID 1880 wrote to memory of 320	1880	file.exe	37
PID 1880 wrote to memory of 320	1880	file.exe	37
PID 1880 wrote to memory of 320	1880	file.exe	37
PID 860 wrote to memory of 1280	860	aqwdiuyn.exe	39
PID 860 wrote to memory of 1280	860	aqwdiuyn.exe	39
PID 860 wrote to memory of 1280	860	aqwdiuyn.exe	39
PID 860 wrote to memory of 1280	860	aqwdiuyn.exe	39
PID 860 wrote to memory of 1280	860	aqwdiuyn.exe	39
PID 860 wrote to memory of 1280	860	aqwdiuyn.exe	39

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1880
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\tuzpepgr\
  2⤵
  PID:1200
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\aqwdiuyn.exe" C:\Windows\SysWOW64\tuzpepgr\
  2⤵
  PID:1088
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create tuzpepgr binPath= "C:\Windows\SysWOW64\tuzpepgr\aqwdiuyn.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:2016
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description tuzpepgr "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2012
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start tuzpepgr
  2⤵
  - Launches sc.exe
  PID:1740
- 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:320

C:\Windows\SysWOW64\tuzpepgr\aqwdiuyn.exe
C:\Windows\SysWOW64\tuzpepgr\aqwdiuyn.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:860
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  PID:1280

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

aqwdiuyn.exe

Path C:\Users\Admin\AppData\Local\Temp\aqwdiuyn.exe
Size 10.1MB
SHA256 7194c7c0209e34f008c07422275833b36153ed29b5e56478d23dcc9920a1c34f
MD5 fb883b4542999ae5b4e59d8ce91bc478
SHA1 9bf2214c5789ff7f56a2aa17f202fc1eacfb18fe
SHA512 2cd6eaa6ae3a2a35c8b998ac7ac8a972846d91a28cb2fb519a0bac68d160cb1b1dbf553ac3fbdfcf90a376be75cf38a5c8b506867dccd9048ea0f4ee7d17c729
SSDEEP 3072:sEmvMBzOl9EyRjf4wwAp2BydibhbX/GeL6SjcDfvPbHcsC7ArBlq3jq3jq3jq3jI:/mEBKJRL4wwo2BykPX6McDf7cB7ArB
MD5 SHA1 SHA512 SSDEEP

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aqwdiuyn.exe

Path C:\Windows\SysWOW64\tuzpepgr\aqwdiuyn.exe
Size 10.1MB
SHA256 7194c7c0209e34f008c07422275833b36153ed29b5e56478d23dcc9920a1c34f
MD5 fb883b4542999ae5b4e59d8ce91bc478
SHA1 9bf2214c5789ff7f56a2aa17f202fc1eacfb18fe
SHA512 2cd6eaa6ae3a2a35c8b998ac7ac8a972846d91a28cb2fb519a0bac68d160cb1b1dbf553ac3fbdfcf90a376be75cf38a5c8b506867dccd9048ea0f4ee7d17c729
SSDEEP 3072:sEmvMBzOl9EyRjf4wwAp2BydibhbX/GeL6SjcDfvPbHcsC7ArBlq3jq3jq3jq3jI:/mEBKJRL4wwo2BykPX6McDf7cB7ArB
MD5 SHA1 SHA512 SSDEEP

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memory/860-78-0x0000000000400000-0x0000000000560000-memory.dmp

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memory/860-76-0x000000000060B000-0x000000000061E000-memory.dmp

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memory/860-71-0x0000000000400000-0x0000000000560000-memory.dmp

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memory/860-70-0x000000000060B000-0x000000000061E000-memory.dmp

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memory/1280-74-0x0000000000110000-0x0000000000125000-memory.dmp

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memory/1280-72-0x0000000000110000-0x0000000000125000-memory.dmp

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memory/1280-83-0x0000000000110000-0x0000000000125000-memory.dmp

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memory/1280-81-0x0000000000110000-0x0000000000125000-memory.dmp

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memory/1880-67-0x0000000000220000-0x0000000000233000-memory.dmp

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memory/1880-57-0x0000000000400000-0x0000000000560000-memory.dmp

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memory/1880-54-0x00000000762B1000-0x00000000762B3000-memory.dmp

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memory/1880-68-0x0000000000400000-0x0000000000560000-memory.dmp

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memory/1880-56-0x0000000000220000-0x0000000000233000-memory.dmp

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memory/1880-55-0x000000000070B000-0x000000000071E000-memory.dmp

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memory/1880-66-0x000000000070B000-0x000000000071E000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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