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
149s
max time network
147s
platform
windows7_x64
resource
win7
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 6 IoCs

rat

resource	yara_rule
behavioral1/memory/528-16-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/528-17-0x000000000040C76E-mapping.dmp	asyncrat
behavioral1/memory/528-18-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/528-19-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral1/memory/860-24-0x000000000040C76E-mapping.dmp	asyncrat
behavioral1/memory/1764-39-0x000000000040C76E-mapping.dmp	asyncrat

Executes dropped EXE 3 IoCs

pid	Process
1968	mrsscncui.exe
388	mrsscncui.exe
1064	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 616 set thread context of 528	616	Order_List_PO# 081928.pdf.exe	36
PID 1968 set thread context of 860	1968	mrsscncui.exe	37
PID 388 set thread context of 1764	388	mrsscncui.exe	41

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
1624	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
616	Order_List_PO# 081928.pdf.exe
616	Order_List_PO# 081928.pdf.exe
616	Order_List_PO# 081928.pdf.exe
1968	mrsscncui.exe
1968	mrsscncui.exe
1968	mrsscncui.exe
388	mrsscncui.exe
388	mrsscncui.exe
388	mrsscncui.exe

Suspicious behavior: MapViewOfSection 3 IoCs

pid	Process
616	Order_List_PO# 081928.pdf.exe
1968	mrsscncui.exe
388	mrsscncui.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	616	Order_List_PO# 081928.pdf.exe
Token: SeDebugPrivilege	528	RegAsm.exe
Token: SeDebugPrivilege	1968	mrsscncui.exe
Token: SeDebugPrivilege	388	mrsscncui.exe

Suspicious use of WriteProcessMemory 56 IoCs

description	pid	Process	procid_target
PID 616 wrote to memory of 1884	616	Order_List_PO# 081928.pdf.exe	28
PID 616 wrote to memory of 1884	616	Order_List_PO# 081928.pdf.exe	28
PID 616 wrote to memory of 1884	616	Order_List_PO# 081928.pdf.exe	28
PID 616 wrote to memory of 1884	616	Order_List_PO# 081928.pdf.exe	28
PID 616 wrote to memory of 1624	616	Order_List_PO# 081928.pdf.exe	30
PID 616 wrote to memory of 1624	616	Order_List_PO# 081928.pdf.exe	30
PID 616 wrote to memory of 1624	616	Order_List_PO# 081928.pdf.exe	30
PID 616 wrote to memory of 1624	616	Order_List_PO# 081928.pdf.exe	30
PID 1952 wrote to memory of 1968	1952	taskeng.exe	33
PID 1952 wrote to memory of 1968	1952	taskeng.exe	33
PID 1952 wrote to memory of 1968	1952	taskeng.exe	33
PID 1952 wrote to memory of 1968	1952	taskeng.exe	33
PID 1968 wrote to memory of 2024	1968	mrsscncui.exe	34
PID 1968 wrote to memory of 2024	1968	mrsscncui.exe	34
PID 1968 wrote to memory of 2024	1968	mrsscncui.exe	34
PID 1968 wrote to memory of 2024	1968	mrsscncui.exe	34
PID 616 wrote to memory of 528	616	Order_List_PO# 081928.pdf.exe	36
PID 616 wrote to memory of 528	616	Order_List_PO# 081928.pdf.exe	36
PID 616 wrote to memory of 528	616	Order_List_PO# 081928.pdf.exe	36
PID 616 wrote to memory of 528	616	Order_List_PO# 081928.pdf.exe	36
PID 616 wrote to memory of 528	616	Order_List_PO# 081928.pdf.exe	36
PID 616 wrote to memory of 528	616	Order_List_PO# 081928.pdf.exe	36
PID 616 wrote to memory of 528	616	Order_List_PO# 081928.pdf.exe	36
PID 616 wrote to memory of 528	616	Order_List_PO# 081928.pdf.exe	36
PID 1968 wrote to memory of 860	1968	mrsscncui.exe	37
PID 1968 wrote to memory of 860	1968	mrsscncui.exe	37
PID 1968 wrote to memory of 860	1968	mrsscncui.exe	37
PID 1968 wrote to memory of 860	1968	mrsscncui.exe	37
PID 1968 wrote to memory of 860	1968	mrsscncui.exe	37
PID 1968 wrote to memory of 860	1968	mrsscncui.exe	37
PID 1968 wrote to memory of 860	1968	mrsscncui.exe	37
PID 1968 wrote to memory of 860	1968	mrsscncui.exe	37
PID 1952 wrote to memory of 388	1952	taskeng.exe	38
PID 1952 wrote to memory of 388	1952	taskeng.exe	38
PID 1952 wrote to memory of 388	1952	taskeng.exe	38
PID 1952 wrote to memory of 388	1952	taskeng.exe	38
PID 388 wrote to memory of 1232	388	mrsscncui.exe	39
PID 388 wrote to memory of 1232	388	mrsscncui.exe	39
PID 388 wrote to memory of 1232	388	mrsscncui.exe	39
PID 388 wrote to memory of 1232	388	mrsscncui.exe	39
PID 388 wrote to memory of 1764	388	mrsscncui.exe	41
PID 388 wrote to memory of 1764	388	mrsscncui.exe	41
PID 388 wrote to memory of 1764	388	mrsscncui.exe	41
PID 388 wrote to memory of 1764	388	mrsscncui.exe	41
PID 388 wrote to memory of 1764	388	mrsscncui.exe	41
PID 388 wrote to memory of 1764	388	mrsscncui.exe	41
PID 388 wrote to memory of 1764	388	mrsscncui.exe	41
PID 388 wrote to memory of 1764	388	mrsscncui.exe	41
PID 1952 wrote to memory of 1064	1952	taskeng.exe	42
PID 1952 wrote to memory of 1064	1952	taskeng.exe	42
PID 1952 wrote to memory of 1064	1952	taskeng.exe	42
PID 1952 wrote to memory of 1064	1952	taskeng.exe	42
PID 1064 wrote to memory of 1524	1064	mrsscncui.exe	43
PID 1064 wrote to memory of 1524	1064	mrsscncui.exe	43
PID 1064 wrote to memory of 1524	1064	mrsscncui.exe	43
PID 1064 wrote to memory of 1524	1064	mrsscncui.exe	43

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:616
- C:\Windows\SysWOW64\schtasks.exe
  "schtasks.exe" /query
  2⤵
  PID:1884
- 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:1624
- 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:528

C:\Windows\system32\taskeng.exe
taskeng.exe {42B118E3-A112-453A-88F5-D65939B0FDF0} S-1-5-21-1131729243-447456001-3632642222-1000:AVGLFESB\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:1952
- C:\Users\Admin\mrsscncui.exe
  C:\Users\Admin\mrsscncui.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1968
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks.exe" /query
    3⤵
    PID:2024
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
    3⤵
    PID:860
- C:\Users\Admin\mrsscncui.exe
  C:\Users\Admin\mrsscncui.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:388
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks.exe" /query
    3⤵
    PID:1232
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
    3⤵
    PID:1764
- C:\Users\Admin\mrsscncui.exe
  C:\Users\Admin\mrsscncui.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of WriteProcessMemory
  PID:1064
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks.exe" /query
    3⤵
    PID:1524

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/388-33-0x0000000000290000-0x0000000000291000-memory.dmp

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memory/388-32-0x0000000074D50000-0x000000007543E000-memory.dmp

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memory/528-20-0x0000000074D50000-0x000000007543E000-memory.dmp

Download

memory/528-16-0x0000000000400000-0x0000000000412000-memory.dmp

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memory/528-18-0x0000000000400000-0x0000000000412000-memory.dmp

Download

memory/528-19-0x0000000000400000-0x0000000000412000-memory.dmp

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memory/616-1-0x0000000000AF0000-0x0000000000AF1000-memory.dmp

Download

memory/616-0-0x0000000074D50000-0x000000007543E000-memory.dmp

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memory/616-3-0x00000000006A0000-0x00000000006B3000-memory.dmp

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memory/860-27-0x0000000074D50000-0x000000007543E000-memory.dmp

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memory/1064-48-0x0000000000D30000-0x0000000000D31000-memory.dmp

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memory/1064-47-0x0000000074D50000-0x000000007543E000-memory.dmp

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memory/1764-42-0x0000000074D50000-0x000000007543E000-memory.dmp

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memory/1968-10-0x0000000074D50000-0x000000007543E000-memory.dmp

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memory/1968-11-0x0000000001200000-0x0000000001201000-memory.dmp

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