asyncrat | 623d707cab5c5dc378a5100018e29f88949f4ea4be4b34cc2fc36e1612b68100

Analysis

max time kernel
146s
max time network
148s
platform
windows10_x64
resource
win10v20201028
submitted
03/12/2020, 08:30

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General

Target
Consignment Document PL&BL Draft.exe
Size 684KB
Sample201203-gxt95cb6rn
SHA256 623d707cab5c5dc378a5100018e29f88949f4ea4be4b34cc2fc36e1612b68100
MD5 b70ffeb2babbacb28b22411beccb4642
SHA1 3c096e92894c9ff7bfae0fcc0ce5f250cb4ebe9f
SHA512 79471594362dcb6f5ecbddb34ce68ddbbfc2320fa088439a54a0dfba7c878d32e5715366808b7a7399f33c9b992e6ebac75d90d9cdc5d591b42e480f4874db41
MD5 SHA1 SHA512

Score

10^/10

asyncrat nanocore evasion keylogger persistence rat spyware stealer trojan

Malware Config

Extracted

Family

nanocore

Version

1.2.2.0

:5550
centurygift.myq-see.com:5550

Mutex

a60f1e04-b281-49b0-9733-22b28c2ea6d7

Attributes

activate_away_mode
true
backup_connection_host
centurygift.myq-see.com
backup_dns_server
centurygift.myq-see.com
buffer_size
65535
build_time
2020-09-08T01:46:57.095018036Z
bypass_user_account_control
true
bypass_user_account_control_data
clear_access_control
true
clear_zone_identifier
false
connect_delay
4000
connection_port
5550
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
a60f1e04-b281-49b0-9733-22b28c2ea6d7
mutex_timeout
5000
prevent_system_sleep
false
primary_connection_host
primary_dns_server
centurygift.myq-see.com
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

Extracted

Family

asyncrat

Version

0.5.7B

centurygift.myq-see.com:5500

Mutex

AsyncMutex_6SI8OkPnk

Attributes

aes_key
bWbB4qsIdUz0RazB3LzXObRAUS2SpbLy
anti_detection
false
autorun
true
bdos
false
delay
Default
host
centurygift.myq-see.com
hwid
3
install_file
install_folder
%Temp%
mutex
AsyncMutex_6SI8OkPnk
pastebin_config
null
port
5500
version
0.5.7B

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers.
rat asyncrat
NanoCore
NanoCore is a remote access tool (RAT) with a variety of capabilities.
keylogger trojan stealer spyware nanocore

Async RAT payload 4 IoCs

rat

resource	yara_rule
behavioral2/files/0x000100000001aba3-31.dat	asyncrat
behavioral2/files/0x000100000001aba3-33.dat	asyncrat
behavioral2/files/0x000100000001abac-55.dat	asyncrat
behavioral2/files/0x000100000001abac-54.dat	asyncrat

Executes dropped EXE 5 IoCs

pid	Process
2756	Rczgwoxvqzh.exe
3852	Icda.exe
1228	Isgeprf.exe
1080	Fdquqwatjjr.exe
200	VLC2.exe

Reads user/profile data of local email clients 2 TTPs
Email clients store some user data on disk where infostealers will often target it.
spyware

Data from Local System
T1005

Credentials in Files
T1081
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware

Data from Local System
T1005

Credentials in Files
T1081

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

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

Checks whether UAC is enabled 1 TTPs 1 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	Icda.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1404 set thread context of 1172	1404	Consignment Document PL&BL Draft.exe	79

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\SMTP Manager\smtpmgr.exe	Icda.exe
File created	C:\Program Files (x86)\SMTP Manager\smtpmgr.exe	Icda.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

pid	Process
3828	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3944	timeout.exe

Suspicious behavior: EnumeratesProcesses 18 IoCs

pid	Process
1080	Fdquqwatjjr.exe
1080	Fdquqwatjjr.exe
3852	Icda.exe
3852	Icda.exe
3852	Icda.exe
1228	Isgeprf.exe
1228	Isgeprf.exe
1228	Isgeprf.exe
1228	Isgeprf.exe
1228	Isgeprf.exe
1228	Isgeprf.exe
1228	Isgeprf.exe
1228	Isgeprf.exe
1228	Isgeprf.exe
1228	Isgeprf.exe
1228	Isgeprf.exe
1228	Isgeprf.exe
1228	Isgeprf.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
3852	Icda.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	1080	Fdquqwatjjr.exe
Token: SeDebugPrivilege	3852	Icda.exe
Token: SeDebugPrivilege	1228	Isgeprf.exe
Token: SeDebugPrivilege	200	VLC2.exe

Suspicious use of WriteProcessMemory 34 IoCs

description	pid	Process	procid_target
PID 1404 wrote to memory of 1172	1404	Consignment Document PL&BL Draft.exe	79
PID 1404 wrote to memory of 1172	1404	Consignment Document PL&BL Draft.exe	79
PID 1404 wrote to memory of 1172	1404	Consignment Document PL&BL Draft.exe	79
PID 1404 wrote to memory of 1172	1404	Consignment Document PL&BL Draft.exe	79
PID 1404 wrote to memory of 1172	1404	Consignment Document PL&BL Draft.exe	79
PID 1404 wrote to memory of 1172	1404	Consignment Document PL&BL Draft.exe	79
PID 1404 wrote to memory of 1172	1404	Consignment Document PL&BL Draft.exe	79
PID 1404 wrote to memory of 1172	1404	Consignment Document PL&BL Draft.exe	79
PID 1172 wrote to memory of 2756	1172	Consignment Document PL&BL Draft.exe	80
PID 1172 wrote to memory of 2756	1172	Consignment Document PL&BL Draft.exe	80
PID 1172 wrote to memory of 3852	1172	Consignment Document PL&BL Draft.exe	81
PID 1172 wrote to memory of 3852	1172	Consignment Document PL&BL Draft.exe	81
PID 1172 wrote to memory of 3852	1172	Consignment Document PL&BL Draft.exe	81
PID 2756 wrote to memory of 1228	2756	Rczgwoxvqzh.exe	82
PID 2756 wrote to memory of 1228	2756	Rczgwoxvqzh.exe	82
PID 2756 wrote to memory of 1228	2756	Rczgwoxvqzh.exe	82
PID 2756 wrote to memory of 1080	2756	Rczgwoxvqzh.exe	83
PID 2756 wrote to memory of 1080	2756	Rczgwoxvqzh.exe	83
PID 2756 wrote to memory of 1080	2756	Rczgwoxvqzh.exe	83
PID 1228 wrote to memory of 1576	1228	Isgeprf.exe	84
PID 1228 wrote to memory of 1576	1228	Isgeprf.exe	84
PID 1228 wrote to memory of 1576	1228	Isgeprf.exe	84
PID 1228 wrote to memory of 1008	1228	Isgeprf.exe	85
PID 1228 wrote to memory of 1008	1228	Isgeprf.exe	85
PID 1228 wrote to memory of 1008	1228	Isgeprf.exe	85
PID 1576 wrote to memory of 3828	1576	cmd.exe	88
PID 1576 wrote to memory of 3828	1576	cmd.exe	88
PID 1576 wrote to memory of 3828	1576	cmd.exe	88
PID 1008 wrote to memory of 3944	1008	cmd.exe	89
PID 1008 wrote to memory of 3944	1008	cmd.exe	89
PID 1008 wrote to memory of 3944	1008	cmd.exe	89
PID 1008 wrote to memory of 200	1008	cmd.exe	91
PID 1008 wrote to memory of 200	1008	cmd.exe	91
PID 1008 wrote to memory of 200	1008	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\Consignment Document PL&BL Draft.exe
"C:\Users\Admin\AppData\Local\Temp\Consignment Document PL&BL Draft.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1404
- C:\Users\Admin\AppData\Local\Temp\Consignment Document PL&BL Draft.exe
  "{path}"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1172
- - C:\Users\Admin\AppData\Local\Temp\Rczgwoxvqzh.exe
    "C:\Users\Admin\AppData\Local\Temp\Rczgwoxvqzh.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of WriteProcessMemory
    PID:2756
  - - C:\Users\Admin\AppData\Local\Temp\Isgeprf.exe
      "C:\Users\Admin\AppData\Local\Temp\Isgeprf.exe"
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:1228
    - - C:\Windows\SysWOW64\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "VLC2" /tr '"C:\Users\Admin\AppData\Local\Temp\VLC2.exe"' & exit
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:1576
      - C:\Windows\SysWOW64\schtasks.exe
        
        schtasks /create /f /sc onlogon /rl highest /tn "VLC2" /tr '"C:\Users\Admin\AppData\Local\Temp\VLC2.exe"'
        6⤵
        Creates scheduled task(s)
        
        PID:3828
    - - C:\Windows\SysWOW64\cmd.exe
        
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp64E5.tmp.bat""
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:1008
      - C:\Windows\SysWOW64\timeout.exe
        
        timeout 3
        6⤵
        Delays execution with timeout.exe
        
        PID:3944
      - C:\Users\Admin\AppData\Local\Temp\VLC2.exe
        
        "C:\Users\Admin\AppData\Local\Temp\VLC2.exe"
        6⤵
        Executes dropped EXE
        Suspicious use of AdjustPrivilegeToken
        
        PID:200
  - - C:\Users\Admin\AppData\Local\Temp\Fdquqwatjjr.exe
      "C:\Users\Admin\AppData\Local\Temp\Fdquqwatjjr.exe"
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:1080
- - C:\Users\Admin\AppData\Local\Temp\Icda.exe
    "C:\Users\Admin\AppData\Local\Temp\Icda.exe"
    3⤵
    - Executes dropped EXE
    - 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:3852

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Registry Run Keys / Startup Folder

T1060

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Modify Registry

T1112

Credential Access

Credentials in Files

T1081

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

memory/200-56-0x0000000071C10000-0x00000000722FE000-memory.dmp

Download

memory/1080-40-0x0000000000650000-0x0000000000651000-memory.dmp

Download

memory/1080-38-0x0000000071C10000-0x00000000722FE000-memory.dmp

Download

memory/1080-50-0x0000000005050000-0x0000000005051000-memory.dmp

Download

memory/1080-51-0x0000000005490000-0x0000000005491000-memory.dmp

Download

memory/1172-15-0x0000000073550000-0x0000000073C3E000-memory.dmp

Download

memory/1172-12-0x0000000000400000-0x000000000044E000-memory.dmp

Download

memory/1228-34-0x0000000071C10000-0x00000000722FE000-memory.dmp

Download

memory/1228-37-0x0000000000BC0000-0x0000000000BC1000-memory.dmp

Download

memory/1404-9-0x0000000007950000-0x0000000007951000-memory.dmp

Download

memory/1404-10-0x0000000005920000-0x000000000592E000-memory.dmp

Download

memory/1404-3-0x0000000000B30000-0x0000000000B31000-memory.dmp

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memory/1404-2-0x0000000073550000-0x0000000073C3E000-memory.dmp

Download

memory/1404-5-0x0000000005950000-0x0000000005951000-memory.dmp

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memory/1404-6-0x0000000005450000-0x0000000005451000-memory.dmp

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memory/1404-7-0x0000000005400000-0x0000000005401000-memory.dmp

Download

memory/1404-11-0x0000000007240000-0x00000000072BD000-memory.dmp

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memory/1404-8-0x0000000007DE0000-0x0000000007DE1000-memory.dmp

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memory/2756-28-0x0000000000640000-0x0000000000641000-memory.dmp

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memory/2756-25-0x00007FFB59970000-0x00007FFB5A35C000-memory.dmp

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