isrstealer | 67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71

Analysis

max time kernel
181s
max time network
182s
platform
windows10-2004_x64
resource
win10v2004-20221111-en
resource tags

arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
submitted
02-12-2022 18:21

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General

Target

67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe
Size

1.1MB
MD5

f65fac3abb55ab1face9519ba539e936
SHA1

40a89c58912a8b9b9b16a9167d63179f603eefd4
SHA256

67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71
SHA512

b54022c35f1d642996a57b0fb0f775b2de36e7545d1d5ffcc0c08e3fd8b49f4c03a89360a71b509c434cf6929f9de3eba96b1bbb4157f42e1199ed9aab502a73
SSDEEP

12288:IafeuuU1Jj/F7g1zjA9zPyKwrIEaIL1UEThBXS2O13u0rl14OtlLCLCSG5:d24zFMV85Py6b663zv5tlmLlO

Score

10^/10

isrstealer collection spyware stealer trojan upx

Malware Config

Signatures

ISR Stealer
ISR Stealer is a modified version of Hackhound Stealer written in visual basic.
trojan stealer isrstealer

ISR Stealer payload 4 IoCs

resource	yara_rule
behavioral2/memory/1076-133-0x0000000000400000-0x0000000000495000-memory.dmp	family_isrstealer
behavioral2/memory/1076-141-0x0000000000400000-0x0000000000495000-memory.dmp	family_isrstealer
behavioral2/memory/1076-161-0x0000000000400000-0x0000000000495000-memory.dmp	family_isrstealer
behavioral2/memory/1076-162-0x0000000000400000-0x0000000000495000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/3596-157-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/3596-160-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 3 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral2/memory/3412-144-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView
behavioral2/memory/3412-153-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView
behavioral2/memory/3412-159-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView

Nirsoft 7 IoCs

resource	yara_rule
behavioral2/memory/3412-144-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral2/memory/3412-153-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral2/memory/3424-154-0x0000000000400000-0x0000000000426000-memory.dmp	Nirsoft
behavioral2/memory/3596-157-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/3412-159-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral2/memory/3424-158-0x0000000000400000-0x0000000000426000-memory.dmp	Nirsoft
behavioral2/memory/3596-160-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 8 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/3424-147-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral2/memory/3424-151-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral2/memory/3424-154-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral2/memory/3596-150-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3596-156-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3596-157-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3424-158-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral2/memory/3596-160-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
spyware stealer

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 stealer

Data from Local System
T1005

Credentials in Files
T1081

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe

Suspicious use of SetThreadContext 5 IoCs

description	pid	Process	procid_target
PID 3864 set thread context of 1076	3864	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	81
PID 1076 set thread context of 4496	1076	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	82
PID 4496 set thread context of 3412	4496	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	83
PID 4496 set thread context of 3424	4496	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	84
PID 4496 set thread context of 3596	4496	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	85

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

System Information Discovery
T1082

Modifies registry class 3 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000_Classes\MIME\Database	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\MIME\Database\Charset	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\MIME\Database\Codepage	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
1076	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe
1076	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe
1076	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe
1076	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe
1076	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe
1076	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe
1076	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe
1076	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe
3424	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe
3424	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3424	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1076	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe

Suspicious use of WriteProcessMemory 35 IoCs

description	pid	Process	procid_target
PID 3864 wrote to memory of 1076	3864	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	81
PID 3864 wrote to memory of 1076	3864	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	81
PID 3864 wrote to memory of 1076	3864	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	81
PID 3864 wrote to memory of 1076	3864	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	81
PID 3864 wrote to memory of 1076	3864	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	81
PID 3864 wrote to memory of 1076	3864	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	81
PID 3864 wrote to memory of 1076	3864	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	81
PID 1076 wrote to memory of 4496	1076	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	82
PID 1076 wrote to memory of 4496	1076	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	82
PID 1076 wrote to memory of 4496	1076	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	82
PID 1076 wrote to memory of 4496	1076	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	82
PID 1076 wrote to memory of 4496	1076	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	82
PID 1076 wrote to memory of 4496	1076	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	82
PID 1076 wrote to memory of 4496	1076	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	82
PID 1076 wrote to memory of 4496	1076	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	82
PID 1076 wrote to memory of 4496	1076	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	82
PID 1076 wrote to memory of 4496	1076	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	82
PID 1076 wrote to memory of 4496	1076	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	82
PID 1076 wrote to memory of 4496	1076	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	82
PID 1076 wrote to memory of 4496	1076	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	82
PID 4496 wrote to memory of 3412	4496	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	83
PID 4496 wrote to memory of 3412	4496	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	83
PID 4496 wrote to memory of 3412	4496	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	83
PID 4496 wrote to memory of 3412	4496	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	83
PID 4496 wrote to memory of 3412	4496	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	83
PID 4496 wrote to memory of 3424	4496	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	84
PID 4496 wrote to memory of 3424	4496	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	84
PID 4496 wrote to memory of 3424	4496	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	84
PID 4496 wrote to memory of 3424	4496	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	84
PID 4496 wrote to memory of 3424	4496	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	84
PID 4496 wrote to memory of 3596	4496	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	85
PID 4496 wrote to memory of 3596	4496	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	85
PID 4496 wrote to memory of 3596	4496	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	85
PID 4496 wrote to memory of 3596	4496	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	85
PID 4496 wrote to memory of 3596	4496	67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe	85

C:\Users\Admin\AppData\Local\Temp\67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe
"C:\Users\Admin\AppData\Local\Temp\67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3864
- C:\Users\Admin\AppData\Local\Temp\67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe
  "C:\Users\Admin\AppData\Local\Temp\67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Modifies registry class
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1076
- - C:\Users\Admin\AppData\Local\Temp\67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe
    "C:\Users\Admin\AppData\Local\Temp\67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe"
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:4496
  - - C:\Users\Admin\AppData\Local\Temp\67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe
      "C:\Users\Admin\AppData\Local\Temp\67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe" /scomma C:\Users\Admin\AppData\Local\Temp\data.dmp
      4⤵
      PID:3412
  - - C:\Users\Admin\AppData\Local\Temp\67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe
      "C:\Users\Admin\AppData\Local\Temp\67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe" /scomma C:\Users\Admin\AppData\Local\Temp\data1.dmp
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:3424
  - - C:\Users\Admin\AppData\Local\Temp\67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe
      "C:\Users\Admin\AppData\Local\Temp\67527e9f75331a4e9fe01b38c5ee91b9c19df0a6dbe4098f58496744a0b55f71.exe" /scomma C:\Users\Admin\AppData\Local\Temp\data2.dmp
      4⤵
      Accesses Microsoft Outlook accounts
      PID:3596

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

T1081

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1076-133-0x0000000000400000-0x0000000000495000-memory.dmp

Filesize
596KB

Download
memory/1076-162-0x0000000000400000-0x0000000000495000-memory.dmp

Filesize
596KB

Download
memory/1076-161-0x0000000000400000-0x0000000000495000-memory.dmp

Filesize
596KB

Download
memory/1076-141-0x0000000000400000-0x0000000000495000-memory.dmp

Filesize
596KB

Download
memory/3412-144-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/3412-159-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/3412-153-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/3424-147-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/3424-154-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/3424-158-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/3424-151-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/3596-150-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3596-156-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3596-157-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3596-160-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4496-140-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/4496-155-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/4496-142-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/4496-139-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/4496-138-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download