asyncrat | 89e9fd57dffefa56428cdea17fb31951591e0f7fbe8d25859dd7c8221f048d3d

Resubmissions

30/09/2020, 14:30

200930-j3wrr6ffqx10

30/09/2020, 14:23

200930-5xqrgfatdx10

30/09/2020, 13:13

200930-aldczeeeps10

Analysis

max time kernel
146s
max time network
150s
platform
windows10_x64
resource
win10v200722
submitted
30/09/2020, 13:13

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General

Target
Order_List_PO# 081928.pdf.exe
Size 238KB
Sample200930-aldczeeeps
SHA256 89e9fd57dffefa56428cdea17fb31951591e0f7fbe8d25859dd7c8221f048d3d
MD5 301e7100433fadd7abb5541d0d9de78b
SHA1 c445aeb7d521b2b3697f4a4aac027c13431e1920
SHA512 b876a5abb868d49f0796163441b692cae69668d16a5117b2924988482ea5864ba2a1f3b97ce833e0181fa428b7a022be50301918c8893599e23cb51bae8f7545
MD5 SHA1 SHA512

Score

10^/10

asyncrat rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

null:null

Mutex

chizzy25@/@!7^UPCAZWSWA

Attributes

aes_key
cmxIVV8s1k52AAfdqMHGzdOJsm6ptr3B
anti_detection
false
autorun
false
bdos
false
delay
RECORDED
host
null
hwid
3
install_file
install_folder
%AppData%
mutex
chizzy25@/@!7^UPCAZWSWA
pastebin_config
https://pastebin.com/raw/HKYwiN9V
port
null
version
0.5.7B

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers.
rat asyncrat

Async RAT payload 4 IoCs

rat

resource	yara_rule
behavioral2/memory/3496-17-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral2/memory/3496-18-0x000000000040C76E-mapping.dmp	asyncrat
behavioral2/memory/2876-23-0x000000000040C76E-mapping.dmp	asyncrat
behavioral2/memory/1616-39-0x000000000040C76E-mapping.dmp	asyncrat

Executes dropped EXE 3 IoCs

pid	Process
692	mrsscncui.exe
1772	mrsscncui.exe
3772	mrsscncui.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 3488 set thread context of 3496	3488	Order_List_PO# 081928.pdf.exe	82
PID 692 set thread context of 2876	692	mrsscncui.exe	83
PID 1772 set thread context of 1616	1772	mrsscncui.exe	89

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
3420	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
3488	Order_List_PO# 081928.pdf.exe
3488	Order_List_PO# 081928.pdf.exe
3488	Order_List_PO# 081928.pdf.exe
692	mrsscncui.exe
692	mrsscncui.exe
692	mrsscncui.exe
1772	mrsscncui.exe
1772	mrsscncui.exe
1772	mrsscncui.exe

Suspicious behavior: MapViewOfSection 5 IoCs

pid	Process
3488	Order_List_PO# 081928.pdf.exe
692	mrsscncui.exe
1772	mrsscncui.exe
1772	mrsscncui.exe
1772	mrsscncui.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	3488	Order_List_PO# 081928.pdf.exe
Token: SeDebugPrivilege	3496	RegAsm.exe
Token: SeDebugPrivilege	692	mrsscncui.exe
Token: SeDebugPrivilege	1772	mrsscncui.exe

Suspicious use of WriteProcessMemory 33 IoCs

description	pid	Process	procid_target
PID 3488 wrote to memory of 3972	3488	Order_List_PO# 081928.pdf.exe	74
PID 3488 wrote to memory of 3972	3488	Order_List_PO# 081928.pdf.exe	74
PID 3488 wrote to memory of 3972	3488	Order_List_PO# 081928.pdf.exe	74
PID 3488 wrote to memory of 3420	3488	Order_List_PO# 081928.pdf.exe	76
PID 3488 wrote to memory of 3420	3488	Order_List_PO# 081928.pdf.exe	76
PID 3488 wrote to memory of 3420	3488	Order_List_PO# 081928.pdf.exe	76
PID 692 wrote to memory of 2780	692	mrsscncui.exe	80
PID 692 wrote to memory of 2780	692	mrsscncui.exe	80
PID 692 wrote to memory of 2780	692	mrsscncui.exe	80
PID 3488 wrote to memory of 3496	3488	Order_List_PO# 081928.pdf.exe	82
PID 3488 wrote to memory of 3496	3488	Order_List_PO# 081928.pdf.exe	82
PID 3488 wrote to memory of 3496	3488	Order_List_PO# 081928.pdf.exe	82
PID 3488 wrote to memory of 3496	3488	Order_List_PO# 081928.pdf.exe	82
PID 692 wrote to memory of 2876	692	mrsscncui.exe	83
PID 692 wrote to memory of 2876	692	mrsscncui.exe	83
PID 692 wrote to memory of 2876	692	mrsscncui.exe	83
PID 692 wrote to memory of 2876	692	mrsscncui.exe	83
PID 1772 wrote to memory of 2244	1772	mrsscncui.exe	85
PID 1772 wrote to memory of 2244	1772	mrsscncui.exe	85
PID 1772 wrote to memory of 2244	1772	mrsscncui.exe	85
PID 1772 wrote to memory of 2068	1772	mrsscncui.exe	87
PID 1772 wrote to memory of 2068	1772	mrsscncui.exe	87
PID 1772 wrote to memory of 2068	1772	mrsscncui.exe	87
PID 1772 wrote to memory of 2100	1772	mrsscncui.exe	88
PID 1772 wrote to memory of 2100	1772	mrsscncui.exe	88
PID 1772 wrote to memory of 2100	1772	mrsscncui.exe	88
PID 1772 wrote to memory of 1616	1772	mrsscncui.exe	89
PID 1772 wrote to memory of 1616	1772	mrsscncui.exe	89
PID 1772 wrote to memory of 1616	1772	mrsscncui.exe	89
PID 1772 wrote to memory of 1616	1772	mrsscncui.exe	89
PID 3772 wrote to memory of 3848	3772	mrsscncui.exe	91
PID 3772 wrote to memory of 3848	3772	mrsscncui.exe	91
PID 3772 wrote to memory of 3848	3772	mrsscncui.exe	91

C:\Users\Admin\AppData\Local\Temp\Order_List_PO# 081928.pdf.exe
"C:\Users\Admin\AppData\Local\Temp\Order_List_PO# 081928.pdf.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3488
- C:\Windows\SysWOW64\schtasks.exe
  "schtasks.exe" /query
  2⤵
  PID:3972
- C:\Windows\SysWOW64\schtasks.exe
  "schtasks.exe" /create /sc MINUTE /tn windowspolicyc /MO 1 /tr C:\Users\Admin\mrsscncui.exe
  2⤵
  - Creates scheduled task(s)
  PID:3420
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3496

C:\Users\Admin\mrsscncui.exe
C:\Users\Admin\mrsscncui.exe
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:692
- C:\Windows\SysWOW64\schtasks.exe
  "schtasks.exe" /query
  2⤵
  PID:2780
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  PID:2876

C:\Users\Admin\mrsscncui.exe
C:\Users\Admin\mrsscncui.exe
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1772
- C:\Windows\SysWOW64\schtasks.exe
  "schtasks.exe" /query
  2⤵
  PID:2244
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  PID:2068
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  PID:2100
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  PID:1616

C:\Users\Admin\mrsscncui.exe
C:\Users\Admin\mrsscncui.exe
1⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:3772
- C:\Windows\SysWOW64\schtasks.exe
  "schtasks.exe" /query
  2⤵
  PID:3848

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Web Service

T1102

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

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Downloads

memory/692-10-0x00000000738A0000-0x0000000073F8E000-memory.dmp

Download

memory/1616-41-0x00000000738A0000-0x0000000073F8E000-memory.dmp

Download

memory/1772-36-0x0000000005FD0000-0x0000000005FE2000-memory.dmp

Download

memory/1772-29-0x00000000738A0000-0x0000000073F8E000-memory.dmp

Download

memory/2876-24-0x00000000738A0000-0x0000000073F8E000-memory.dmp

Download

memory/3488-4-0x0000000004C90000-0x0000000004CA3000-memory.dmp

Download

memory/3488-0-0x00000000738A0000-0x0000000073F8E000-memory.dmp

Download

memory/3488-3-0x0000000004AB0000-0x0000000004AB1000-memory.dmp

Download

memory/3488-1-0x0000000000150000-0x0000000000151000-memory.dmp

Download

memory/3496-17-0x0000000000400000-0x0000000000412000-memory.dmp

Download

memory/3496-19-0x00000000738A0000-0x0000000073F8E000-memory.dmp

Download

memory/3772-45-0x00000000738A0000-0x0000000073F8E000-memory.dmp

Download