nanocore | ef5b4a828d4322e2ca5681423488e03e9991191809fc068d80ce0bbeba792984

General

Target

invoices-docs-view.exe
Size

439KB
MD5

a635c9a6dfa79affe8bf27cb4eae89d4
SHA1

b0d2e8f668085ef770757c5498ba84f506285381
SHA256

ef5b4a828d4322e2ca5681423488e03e9991191809fc068d80ce0bbeba792984
SHA512

81e0b8d0dab93e4f566bbdaeab2a10396a95c6826a45fc02f41cf19fbbb6a41a2d592762d58b37ad4dc23ee08ead77e9e60372f2d630057b5f94cb3997ae1d3a

Score

10^/10

nanocore coreentity evasion keylogger persistence rezer0 spyware stealer trojan

Malware Config

Extracted

Family

nanocore

Version

1.2.2.0

C2

79.134.225.89:12190

Mutex

4e4951f6-c9ee-4a8b-863c-f53c12df989f

Attributes

activate_away_mode
true
backup_connection_host
79.134.225.89
backup_dns_server
8.8.4.4
buffer_size
65535
build_time
2020-02-17T01:50:29.200734436Z
bypass_user_account_control
true
bypass_user_account_control_data
clear_access_control
true
clear_zone_identifier
false
connect_delay
4000
connection_port
12190
default_group
cpa
enable_debug_mode
true
gc_threshold
1.048576e+07
keep_alive_timeout
30000
keyboard_logging
false
lan_timeout
2500
max_packet_size
1.048576e+07
mutex
4e4951f6-c9ee-4a8b-863c-f53c12df989f
mutex_timeout
5000
prevent_system_sleep
false
primary_connection_host
79.134.225.89
primary_dns_server
8.8.8.8
request_elevation
true
restart_delay
5000
run_delay
0
run_on_startup
false
set_critical_process
true
timeout_interval
5000
use_custom_dns_server
false
version
1.2.2.0
wan_timeout
8000

Signatures

CoreEntity .NET Packer 1 IoCs

A .NET packer called CoreEntity where it has embedded the payload as a BitMap object which is later decrypted.

coreentity

Processes:

resource	yara_rule
behavioral2/memory/648-8-0x000000000A580000-0x000000000A583000-memory.dmp	coreentity

NanoCore
NanoCore is a remote access tool (RAT) with a variety of capabilities.
keylogger trojan stealer spyware nanocore

rezer0 1 IoCs

Detects ReZer0, a packer with multiple versions used in various campaigns.

rezer0

Processes:

resource	yara_rule
behavioral2/memory/648-9-0x000000000AC10000-0x000000000AC4A000-memory.dmp	rezer0

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

invoices-docs-view.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\SMTP Manager = "C:\\Program Files (x86)\\SMTP Manager\\smtpmgr.exe"	invoices-docs-view.exe

Checks whether UAC is enabled 1 TTPs 1 IoCs
evasion trojan

System Information Discovery
T1082

Processes:

invoices-docs-view.exe

description ioc process

Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA invoices-docs-view.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

invoices-docs-view.exe

description pid process target process

PID 648 set thread context of 1472 648 invoices-docs-view.exe invoices-docs-view.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	invoices-docs-view.exe

description	pid	process	target process
PID 648 set thread context of 1472	648	invoices-docs-view.exe	invoices-docs-view.exe

Drops file in Program Files directory 2 IoCs

Processes:

invoices-docs-view.exe

description	ioc	process
File created	C:\Program Files (x86)\SMTP Manager\smtpmgr.exe	invoices-docs-view.exe
File opened for modification	C:\Program Files (x86)\SMTP Manager\smtpmgr.exe	invoices-docs-view.exe

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

Scheduled Task
T1053

Processes:

schtasks.exe

pid process

184 schtasks.exe
Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

invoices-docs-view.exeinvoices-docs-view.exe

pid process

648 invoices-docs-view.exe
1472 invoices-docs-view.exe
1472 invoices-docs-view.exe
1472 invoices-docs-view.exe
Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

invoices-docs-view.exe

pid process

1472 invoices-docs-view.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

invoices-docs-view.exeinvoices-docs-view.exe

description pid process

Token: SeDebugPrivilege 648 invoices-docs-view.exe
Token: SeDebugPrivilege 1472 invoices-docs-view.exe
Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

invoices-docs-view.exe

pid process

648 invoices-docs-view.exe
648 invoices-docs-view.exe

pid	process
184	schtasks.exe

pid	process
648	invoices-docs-view.exe
1472	invoices-docs-view.exe
1472	invoices-docs-view.exe
1472	invoices-docs-view.exe

pid	process
1472	invoices-docs-view.exe

description	pid	process
Token: SeDebugPrivilege	648	invoices-docs-view.exe
Token: SeDebugPrivilege	1472	invoices-docs-view.exe

pid	process
648	invoices-docs-view.exe
648	invoices-docs-view.exe

Suspicious use of WriteProcessMemory 11 IoCs

Processes:

invoices-docs-view.exe

description	pid	process	target process
PID 648 wrote to memory of 184	648	invoices-docs-view.exe	schtasks.exe
PID 648 wrote to memory of 184	648	invoices-docs-view.exe	schtasks.exe
PID 648 wrote to memory of 184	648	invoices-docs-view.exe	schtasks.exe
PID 648 wrote to memory of 1472	648	invoices-docs-view.exe	invoices-docs-view.exe
PID 648 wrote to memory of 1472	648	invoices-docs-view.exe	invoices-docs-view.exe
PID 648 wrote to memory of 1472	648	invoices-docs-view.exe	invoices-docs-view.exe
PID 648 wrote to memory of 1472	648	invoices-docs-view.exe	invoices-docs-view.exe
PID 648 wrote to memory of 1472	648	invoices-docs-view.exe	invoices-docs-view.exe
PID 648 wrote to memory of 1472	648	invoices-docs-view.exe	invoices-docs-view.exe
PID 648 wrote to memory of 1472	648	invoices-docs-view.exe	invoices-docs-view.exe
PID 648 wrote to memory of 1472	648	invoices-docs-view.exe	invoices-docs-view.exe

C:\Users\Admin\AppData\Local\Temp\invoices-docs-view.exe
"C:\Users\Admin\AppData\Local\Temp\invoices-docs-view.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:648

C:\Windows\SysWOW64\schtasks.exe
"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\IHVeunQQvXE" /XML "C:\Users\Admin\AppData\Local\Temp\tmp8E2C.tmp"
2⤵
- Creates scheduled task(s)
PID:184

C:\Users\Admin\AppData\Local\Temp\invoices-docs-view.exe
"{path}"
2⤵
- Adds Run key to start application
- Checks whether UAC is enabled
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
PID:1472

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Registry Run Keys / Startup Folder

1

T1060

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\invoices-docs-view.exe.log
MD5
b4f7a6a57cb46d94b72410eb6a6d45a9

SHA1
69f3596ffa027202d391444b769ceea0ae14c5f7

SHA256
23994ebe221a48ea16ebad51ae0d4b47ccd415ae10581f9405e588d4f6c2523b

SHA512
be6da516e54c3a5b33ac2603137a2f8cf8445ff5961dd266faedf3627bae8979953d7ef305538df0151c609917a5b99bf5d023bdd32de50fd5c723950f90db5c

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp8E2C.tmp
MD5
b9a58f017610dd4bce0952718d77756a

SHA1
d4a6005357c91c6b0865dd054039c074016c087d

SHA256
4a216290d2be3d6ebf0b02f6b31089e3b3ea550757b164cb9175caf6b30f5813

SHA512
a671224ae9c60b27678817c7b6568b4360b2c41bd3798a3afc20b70281bd10c2b38187aa5166dc3f73a0435de661a636dd42bdd64451d663e76a2c44721b1319

Download Submit
memory/184-11-0x0000000000000000-mapping.dmp

Download
memory/648-9-0x000000000AC10000-0x000000000AC4A000-memory.dmp

Filesize
232KB

Download
memory/648-4-0x0000000007CA0000-0x0000000007CA1000-memory.dmp

Filesize
4KB

Download
memory/648-6-0x0000000004C30000-0x0000000004C40000-memory.dmp

Filesize
64KB

Download
memory/648-7-0x0000000004C80000-0x0000000004C81000-memory.dmp

Filesize
4KB

Download
memory/648-8-0x000000000A580000-0x000000000A583000-memory.dmp

Filesize
12KB

Download
memory/648-0-0x00000000730E0000-0x00000000737CE000-memory.dmp

Filesize
6.9MB

Download
memory/648-10-0x000000000AE50000-0x000000000AE51000-memory.dmp

Filesize
4KB

Download
memory/648-5-0x0000000007840000-0x0000000007841000-memory.dmp

Filesize
4KB

Download
memory/648-3-0x0000000005200000-0x0000000005242000-memory.dmp

Filesize
264KB

Download
memory/648-1-0x0000000000790000-0x0000000000791000-memory.dmp

Filesize
4KB

Download
memory/1472-14-0x000000000041E792-mapping.dmp

Download
memory/1472-13-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1472-16-0x00000000730E0000-0x00000000737CE000-memory.dmp

Filesize
6.9MB

Download
memory/1472-23-0x0000000005650000-0x0000000005655000-memory.dmp

Filesize
20KB

Download
memory/1472-24-0x0000000005CF0000-0x0000000005D09000-memory.dmp

Filesize
100KB

Download
memory/1472-25-0x0000000005F20000-0x0000000005F23000-memory.dmp

Filesize
12KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads