gozi_ifsb | 46dc49be65d7165e2a6009854a4f27f0088230199e61e0555cb1bd266535874a

Analysis

max time kernel
154s
max time network
143s
platform
windows7_x64
resource
win7v200722
submitted
11-08-2020 12:30

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General

Target

foo/b6e7c9793cf40153bf8865195e06ecbc.exe

Score

10^/10

gozi_ifsb banker bootkit evasion persistence trojan

Malware Config

Signatures

Gozi, Gozi IFSB
Gozi ISFB is a well-known and widely distributed banking trojan.
banker trojan gozi_ifsb
Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497
Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

1920 Client.exe

pid	process
1920	Client.exe

Checks BIOS information in registry 2 TTPs 4 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

Processes:

b6e7c9793cf40153bf8865195e06ecbc.exeClient.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	b6e7c9793cf40153bf8865195e06ecbc.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	Client.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	Client.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	b6e7c9793cf40153bf8865195e06ecbc.exe

Identifies Wine through registry keys 2 TTPs 2 IoCs

Wine is a compatibility layer capable of running Windows applications, which can be used as sandboxing environment.

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

Processes:

b6e7c9793cf40153bf8865195e06ecbc.exeClient.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-403932158-3302036622-1224131197-1000\Software\Wine	b6e7c9793cf40153bf8865195e06ecbc.exe
Key opened	\REGISTRY\USER\S-1-5-21-403932158-3302036622-1224131197-1000\Software\Wine	Client.exe

Loads dropped DLL 1 IoCs

Processes:

b6e7c9793cf40153bf8865195e06ecbc.exe

pid process

776 b6e7c9793cf40153bf8865195e06ecbc.exe

pid	process
776	b6e7c9793cf40153bf8865195e06ecbc.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

b6e7c9793cf40153bf8865195e06ecbc.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-403932158-3302036622-1224131197-1000\Software\Microsoft\Windows\CurrentVersion\Run\MailRuHelp = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\foo\\b6e7c9793cf40153bf8865195e06ecbc.exe\""	b6e7c9793cf40153bf8865195e06ecbc.exe

Checks whether UAC is enabled 1 TTPs 2 IoCs

evasion trojan

System Information Discovery

T1082

Processes:

b6e7c9793cf40153bf8865195e06ecbc.exeClient.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	b6e7c9793cf40153bf8865195e06ecbc.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	Client.exe

Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

1 ip-api.com

flow	ioc
1	ip-api.com

Writes to the Master Boot Record (MBR) 1 TTPs 2 IoCs

Bootkits write to the MBR to gain persistence at a level below the operating system.

bootkit persistence

Bootkit

T1067

Processes:

b6e7c9793cf40153bf8865195e06ecbc.exeClient.exe

description	ioc	process
File opened for modification	\??\PhysicalDrive0	b6e7c9793cf40153bf8865195e06ecbc.exe
File opened for modification	\??\PhysicalDrive0	Client.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

Processes:

b6e7c9793cf40153bf8865195e06ecbc.exeClient.exe

pid process

776 b6e7c9793cf40153bf8865195e06ecbc.exe
1920 Client.exe

pid	process
776	b6e7c9793cf40153bf8865195e06ecbc.exe
1920	Client.exe

Drops file in Program Files directory 4 IoCs

Processes:

b6e7c9793cf40153bf8865195e06ecbc.exeClient.exe

description	ioc	process
File created	C:\Program Files (x86)\Subzero\Client.exe	b6e7c9793cf40153bf8865195e06ecbc.exe
File opened for modification	C:\Program Files (x86)\Subzero\Client.exe	b6e7c9793cf40153bf8865195e06ecbc.exe
File opened for modification	C:\Program Files (x86)\Subzero\Client.exe	Client.exe
File opened for modification	C:\Program Files (x86)\Subzero	Client.exe

Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task
T1053

Processes:

schtasks.exeschtasks.exe

pid process

1884 schtasks.exe
2012 schtasks.exe
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

b6e7c9793cf40153bf8865195e06ecbc.exeClient.exe

pid process

776 b6e7c9793cf40153bf8865195e06ecbc.exe
1920 Client.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

b6e7c9793cf40153bf8865195e06ecbc.exeClient.exe

description pid process

Token: SeDebugPrivilege 776 b6e7c9793cf40153bf8865195e06ecbc.exe
Token: SeDebugPrivilege 1920 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

1920 Client.exe

pid	process
1884	schtasks.exe
2012	schtasks.exe

pid	process
776	b6e7c9793cf40153bf8865195e06ecbc.exe
1920	Client.exe

description	pid	process
Token: SeDebugPrivilege	776	b6e7c9793cf40153bf8865195e06ecbc.exe
Token: SeDebugPrivilege	1920	Client.exe

pid	process
1920	Client.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

b6e7c9793cf40153bf8865195e06ecbc.exeClient.exe

description	pid	process	target process
PID 776 wrote to memory of 1884	776	b6e7c9793cf40153bf8865195e06ecbc.exe	schtasks.exe
PID 776 wrote to memory of 1884	776	b6e7c9793cf40153bf8865195e06ecbc.exe	schtasks.exe
PID 776 wrote to memory of 1884	776	b6e7c9793cf40153bf8865195e06ecbc.exe	schtasks.exe
PID 776 wrote to memory of 1884	776	b6e7c9793cf40153bf8865195e06ecbc.exe	schtasks.exe
PID 776 wrote to memory of 1920	776	b6e7c9793cf40153bf8865195e06ecbc.exe	Client.exe
PID 776 wrote to memory of 1920	776	b6e7c9793cf40153bf8865195e06ecbc.exe	Client.exe
PID 776 wrote to memory of 1920	776	b6e7c9793cf40153bf8865195e06ecbc.exe	Client.exe
PID 776 wrote to memory of 1920	776	b6e7c9793cf40153bf8865195e06ecbc.exe	Client.exe
PID 1920 wrote to memory of 2012	1920	Client.exe	schtasks.exe
PID 1920 wrote to memory of 2012	1920	Client.exe	schtasks.exe
PID 1920 wrote to memory of 2012	1920	Client.exe	schtasks.exe
PID 1920 wrote to memory of 2012	1920	Client.exe	schtasks.exe

C:\Users\Admin\AppData\Local\Temp\foo\b6e7c9793cf40153bf8865195e06ecbc.exe
"C:\Users\Admin\AppData\Local\Temp\foo\b6e7c9793cf40153bf8865195e06ecbc.exe"
1⤵
- Checks BIOS information in registry
- Identifies Wine through registry keys
- Loads dropped DLL
- Adds Run key to start application
- Checks whether UAC is enabled
- Writes to the Master Boot Record (MBR)
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:776
- C:\Windows\SysWOW64\schtasks.exe
  "schtasks" /create /tn "MailRuHelp" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\foo\b6e7c9793cf40153bf8865195e06ecbc.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:1884
- C:\Program Files (x86)\Subzero\Client.exe
  "C:\Program Files (x86)\Subzero\Client.exe"
  2⤵
  - Executes dropped EXE
  - Checks BIOS information in registry
  - Identifies Wine through registry keys
  - Checks whether UAC is enabled
  - Writes to the Master Boot Record (MBR)
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Drops file in Program Files directory
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1920
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "MailRuHelp" /sc ONLOGON /tr "C:\Program Files (x86)\Subzero\Client.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:2012

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Bootkit

T1067

Registry Run Keys / Startup Folder

T1060

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Modify Registry

T1112

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Program Files (x86)\Subzero\Client.exe

MD5
b6e7c9793cf40153bf8865195e06ecbc

SHA1
fef5dbf8ef53dafd676818196815e6b110f2bc03

SHA256
0e0cb0d76bc848f729878dab7218f4e12c9c0cc7d5c939e5d92995ba422ea7ec

SHA512
d12eb44304f7054e060a105bff9f3861aa16bb10fd72bbd819a8ffe3d23818ce66f5d790a929d41cee4161bbbe78d0077d167fe792c3e27c018dc88632a5e5ee

Download Submit
C:\Program Files (x86)\Subzero\Client.exe

MD5
b6e7c9793cf40153bf8865195e06ecbc

SHA1
fef5dbf8ef53dafd676818196815e6b110f2bc03

SHA256
0e0cb0d76bc848f729878dab7218f4e12c9c0cc7d5c939e5d92995ba422ea7ec

SHA512
d12eb44304f7054e060a105bff9f3861aa16bb10fd72bbd819a8ffe3d23818ce66f5d790a929d41cee4161bbbe78d0077d167fe792c3e27c018dc88632a5e5ee

Download Submit
C:\ProgramData\mntemp

MD5
b678a8df2ac09b774d8c5b1a62b73019

SHA1
3d154e03216a25fe5c8edc19dc688aca247ed747

SHA256
03909f4f92333be24c55611b1257631f18420b8759fa8fdd1771c04a1b7f786a

SHA512
ad672bce0157507bd2ff4736745a3f451814e6bc55f85ea0a8688b28537a268c338214a2ee3dc007063a60c6d53ba63a589cadae2fd00883d347de94272f82c9

Download Submit
\Program Files (x86)\Subzero\Client.exe

MD5
b6e7c9793cf40153bf8865195e06ecbc

SHA1
fef5dbf8ef53dafd676818196815e6b110f2bc03

SHA256
0e0cb0d76bc848f729878dab7218f4e12c9c0cc7d5c939e5d92995ba422ea7ec

SHA512
d12eb44304f7054e060a105bff9f3861aa16bb10fd72bbd819a8ffe3d23818ce66f5d790a929d41cee4161bbbe78d0077d167fe792c3e27c018dc88632a5e5ee

Download Submit
memory/776-1-0x00000000050B0000-0x00000000050C1000-memory.dmp

Filesize
68KB

Download
memory/776-2-0x0000000074BE0000-0x00000000752CE000-memory.dmp

Filesize
6.9MB

Download
memory/776-3-0x0000000001030000-0x0000000001031000-memory.dmp

Filesize
4KB

Download
memory/776-0-0x0000000004CA0000-0x0000000004CB1000-memory.dmp

Filesize
68KB

Download
memory/1884-5-0x0000000000000000-mapping.dmp

Download
memory/1920-7-0x0000000000000000-mapping.dmp

Download
memory/1920-10-0x0000000005280000-0x0000000005291000-memory.dmp

Filesize
68KB

Download
memory/1920-12-0x0000000074BD0000-0x00000000752BE000-memory.dmp

Filesize
6.9MB

Download
memory/1920-13-0x0000000000C70000-0x0000000000C71000-memory.dmp

Filesize
4KB

Download
memory/1920-9-0x0000000004E70000-0x0000000004E81000-memory.dmp

Filesize
68KB

Download
memory/2012-15-0x0000000000000000-mapping.dmp

Download