nanocore | 989f797cd2fdf4a061dffaab1f1e15194221a3fe0a1d9e1372d32dcd331b9f27

General

Target

halkbank,pdf.exe
Size

505KB
MD5

c2ae801ef06c2ccb81a80b570d37083d
SHA1

802f68b12a3c4b574a7f75f24d43e41e06e105c0
SHA256

a9352a90a15c864ae05d1d1138aff00094883dc44afffc471e837e46fe3eb24e
SHA512

700ef3edbdaa64de7887cb9edfbf40006a704ab278a33aa02b989e619cf6337568144bf3b0c2f09e1ce1fb3dd80ed406625510f6ea02dd3c1df7127ec8297035

Score

10^/10

nanocore evasion keylogger persistence rezer0 spyware stealer trojan

Malware Config

Extracted

Family

nanocore

Version

1.2.2.0

C2

jfncghc.ddns.net:4040

127.0.0.1:4040

Mutex

e2279684-e454-4079-806c-610ddaafcce7

Attributes

activate_away_mode
true
backup_connection_host
127.0.0.1
backup_dns_server
8.8.4.4
buffer_size
65535
build_time
2020-03-28T14:53:11.033143636Z
bypass_user_account_control
true
bypass_user_account_control_data
clear_access_control
true
clear_zone_identifier
false
connect_delay
4000
connection_port
4040
default_group
Default
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
e2279684-e454-4079-806c-610ddaafcce7
mutex_timeout
5000
prevent_system_sleep
false
primary_connection_host
jfncghc.ddns.net
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

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

ReZer0 packer 1 IoCs

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

rezer0

Processes:

resource	yara_rule
behavioral1/memory/784-57-0x0000000000B20000-0x0000000000B60000-memory.dmp	rezer0

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

halkbank,pdf.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\DSL Service = "C:\\Program Files (x86)\\DSL Service\\dslsvc.exe"	halkbank,pdf.exe

Checks whether UAC is enabled 1 TTPs 1 IoCs
evasion trojan

System Information Discovery
T1082

Processes:

halkbank,pdf.exe

description ioc process

Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA halkbank,pdf.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

halkbank,pdf.exe

description pid process target process

PID 784 set thread context of 1936 784 halkbank,pdf.exe halkbank,pdf.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	halkbank,pdf.exe

description	pid	process	target process
PID 784 set thread context of 1936	784	halkbank,pdf.exe	halkbank,pdf.exe

Drops file in Program Files directory 2 IoCs

Processes:

halkbank,pdf.exe

description	ioc	process
File created	C:\Program Files (x86)\DSL Service\dslsvc.exe	halkbank,pdf.exe
File opened for modification	C:\Program Files (x86)\DSL Service\dslsvc.exe	halkbank,pdf.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
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

1880 schtasks.exe
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

halkbank,pdf.exe

pid process

1936 halkbank,pdf.exe
1936 halkbank,pdf.exe
Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

halkbank,pdf.exe

pid process

1936 halkbank,pdf.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

halkbank,pdf.exe

description pid process

Token: SeDebugPrivilege 1936 halkbank,pdf.exe

pid	process
1880	schtasks.exe

pid	process
1936	halkbank,pdf.exe
1936	halkbank,pdf.exe

pid	process
1936	halkbank,pdf.exe

description	pid	process
Token: SeDebugPrivilege	1936	halkbank,pdf.exe

Suspicious use of WriteProcessMemory 13 IoCs

Processes:

halkbank,pdf.exe

description	pid	process	target process
PID 784 wrote to memory of 1880	784	halkbank,pdf.exe	schtasks.exe
PID 784 wrote to memory of 1880	784	halkbank,pdf.exe	schtasks.exe
PID 784 wrote to memory of 1880	784	halkbank,pdf.exe	schtasks.exe
PID 784 wrote to memory of 1880	784	halkbank,pdf.exe	schtasks.exe
PID 784 wrote to memory of 1936	784	halkbank,pdf.exe	halkbank,pdf.exe
PID 784 wrote to memory of 1936	784	halkbank,pdf.exe	halkbank,pdf.exe
PID 784 wrote to memory of 1936	784	halkbank,pdf.exe	halkbank,pdf.exe
PID 784 wrote to memory of 1936	784	halkbank,pdf.exe	halkbank,pdf.exe
PID 784 wrote to memory of 1936	784	halkbank,pdf.exe	halkbank,pdf.exe
PID 784 wrote to memory of 1936	784	halkbank,pdf.exe	halkbank,pdf.exe
PID 784 wrote to memory of 1936	784	halkbank,pdf.exe	halkbank,pdf.exe
PID 784 wrote to memory of 1936	784	halkbank,pdf.exe	halkbank,pdf.exe
PID 784 wrote to memory of 1936	784	halkbank,pdf.exe	halkbank,pdf.exe

C:\Users\Admin\AppData\Local\Temp\halkbank,pdf.exe
"C:\Users\Admin\AppData\Local\Temp\halkbank,pdf.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:784
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\COyyrcBB" /XML "C:\Users\Admin\AppData\Local\Temp\tmp1278.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:1880
- C:\Users\Admin\AppData\Local\Temp\halkbank,pdf.exe
  "C:\Users\Admin\AppData\Local\Temp\halkbank,pdf.exe"
  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:1936

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Registry Run Keys / Startup Folder

Scheduled Task

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp1278.tmp

Filesize
1KB

MD5
00fe167e58eba6b9ffe00f91ff42e5ee

SHA1
678ce3c6cdc033db51b2269be9cab131ff79b530

SHA256
2b3b681fca26750412ff9cf299680d6c77b366e467fb34c234205495173c3ea9

SHA512
bd1be4caad858cf7509709302e06818eae9dea5260185f356daf547fed9b1c76ab380686d266c4381f6cb789db50a8cd8bc4cee5bcdb23f26a5987e3d9389895

Download Submit
memory/784-54-0x0000000000D80000-0x0000000000E04000-memory.dmp

Filesize
528KB

Download
memory/784-55-0x0000000075701000-0x0000000075703000-memory.dmp

Filesize
8KB

Download
memory/784-56-0x0000000000400000-0x0000000000408000-memory.dmp

Filesize
32KB

Download
memory/784-57-0x0000000000B20000-0x0000000000B60000-memory.dmp

Filesize
256KB

Download
memory/1880-58-0x0000000000000000-mapping.dmp

Download
memory/1936-63-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1936-61-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1936-60-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1936-64-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1936-66-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1936-67-0x000000000041E792-mapping.dmp

Download
memory/1936-69-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1936-71-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1936-73-0x0000000000450000-0x000000000045A000-memory.dmp

Filesize
40KB

Download
memory/1936-74-0x0000000000470000-0x000000000048E000-memory.dmp

Filesize
120KB

Download
memory/1936-75-0x0000000000460000-0x000000000046A000-memory.dmp

Filesize
40KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads