isrstealer | 955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859

Analysis

max time kernel
152s
max time network
180s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
01-12-2022 00:30

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General

Target

955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe
Size

475KB
MD5

e666f97283e213d5656482be7ea1c681
SHA1

6b17adcf8857c3d6ee0077d8f817448f01a371dc
SHA256

955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859
SHA512

b3f11361d47bd07e2edbc8884ac644f33d38df313939358f627181e985b190e1af1ce0c1baeebdfc13eff84407b4e3f1c13552f1539e698535770f5f0400ab13
SSDEEP

12288:cRXLH8P4mZp5QXw8f+hp4Y66+Oo7qS1fvDHqv4wFg960er:cRXLcP4mZp6yj4K+7OSlDHp3Ler

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 5 IoCs

resource	yara_rule
behavioral2/memory/3024-136-0x0000000000000000-mapping.dmp	family_isrstealer
behavioral2/memory/3024-137-0x0000000000400000-0x0000000000470000-memory.dmp	family_isrstealer
behavioral2/memory/3024-146-0x0000000000400000-0x0000000000470000-memory.dmp	family_isrstealer
behavioral2/memory/3024-171-0x0000000000400000-0x0000000000470000-memory.dmp	family_isrstealer
behavioral2/memory/3024-172-0x0000000000400000-0x0000000000470000-memory.dmp	family_isrstealer

NirSoft MailPassView 4 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/1340-164-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/1340-167-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/1340-166-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/1340-168-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 4 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral2/memory/676-149-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView
behavioral2/memory/676-153-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView
behavioral2/memory/676-156-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView
behavioral2/memory/676-169-0x0000000000400000-0x0000000000454000-memory.dmp	WebBrowserPassView

Nirsoft 10 IoCs

resource	yara_rule
behavioral2/memory/676-149-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral2/memory/676-153-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral2/memory/3664-161-0x0000000000400000-0x0000000000426000-memory.dmp	Nirsoft
behavioral2/memory/676-156-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral2/memory/1340-164-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/3664-165-0x0000000000400000-0x0000000000426000-memory.dmp	Nirsoft
behavioral2/memory/1340-167-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/1340-166-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/676-169-0x0000000000400000-0x0000000000454000-memory.dmp	Nirsoft
behavioral2/memory/1340-168-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 10 IoCs

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

upx

resource	yara_rule
behavioral2/memory/3664-152-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral2/memory/1340-158-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3664-161-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral2/memory/3664-159-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral2/memory/1340-163-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1340-164-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3664-165-0x0000000000400000-0x0000000000426000-memory.dmp	upx
behavioral2/memory/1340-167-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1340-166-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1340-168-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Loads dropped DLL 1 IoCs

pid	Process
4868	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe

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-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe

Suspicious use of SetThreadContext 6 IoCs

description	pid	Process	procid_target
PID 4868 set thread context of 548	4868	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	79
PID 548 set thread context of 3024	548	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	80
PID 3024 set thread context of 4312	3024	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	81
PID 4312 set thread context of 676	4312	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	82
PID 4312 set thread context of 3664	4312	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	83
PID 4312 set thread context of 1340	4312	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	84

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3664	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe
3664	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3664	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3024	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe

Suspicious use of WriteProcessMemory 43 IoCs

description	pid	Process	procid_target
PID 4868 wrote to memory of 548	4868	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	79
PID 4868 wrote to memory of 548	4868	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	79
PID 4868 wrote to memory of 548	4868	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	79
PID 4868 wrote to memory of 548	4868	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	79
PID 4868 wrote to memory of 548	4868	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	79
PID 4868 wrote to memory of 548	4868	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	79
PID 4868 wrote to memory of 548	4868	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	79
PID 548 wrote to memory of 3024	548	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	80
PID 548 wrote to memory of 3024	548	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	80
PID 548 wrote to memory of 3024	548	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	80
PID 548 wrote to memory of 3024	548	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	80
PID 548 wrote to memory of 3024	548	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	80
PID 548 wrote to memory of 3024	548	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	80
PID 548 wrote to memory of 3024	548	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	80
PID 548 wrote to memory of 3024	548	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	80
PID 3024 wrote to memory of 4312	3024	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	81
PID 3024 wrote to memory of 4312	3024	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	81
PID 3024 wrote to memory of 4312	3024	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	81
PID 3024 wrote to memory of 4312	3024	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	81
PID 3024 wrote to memory of 4312	3024	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	81
PID 3024 wrote to memory of 4312	3024	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	81
PID 3024 wrote to memory of 4312	3024	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	81
PID 3024 wrote to memory of 4312	3024	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	81
PID 3024 wrote to memory of 4312	3024	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	81
PID 3024 wrote to memory of 4312	3024	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	81
PID 3024 wrote to memory of 4312	3024	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	81
PID 3024 wrote to memory of 4312	3024	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	81
PID 3024 wrote to memory of 4312	3024	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	81
PID 4312 wrote to memory of 676	4312	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	82
PID 4312 wrote to memory of 676	4312	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	82
PID 4312 wrote to memory of 676	4312	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	82
PID 4312 wrote to memory of 676	4312	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	82
PID 4312 wrote to memory of 676	4312	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	82
PID 4312 wrote to memory of 3664	4312	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	83
PID 4312 wrote to memory of 3664	4312	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	83
PID 4312 wrote to memory of 3664	4312	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	83
PID 4312 wrote to memory of 3664	4312	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	83
PID 4312 wrote to memory of 3664	4312	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	83
PID 4312 wrote to memory of 1340	4312	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	84
PID 4312 wrote to memory of 1340	4312	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	84
PID 4312 wrote to memory of 1340	4312	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	84
PID 4312 wrote to memory of 1340	4312	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	84
PID 4312 wrote to memory of 1340	4312	955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe	84

C:\Users\Admin\AppData\Local\Temp\955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe
"C:\Users\Admin\AppData\Local\Temp\955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe"
1⤵
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4868
- C:\Users\Admin\AppData\Local\Temp\955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe
  "C:\Users\Admin\AppData\Local\Temp\955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of WriteProcessMemory
  PID:548
- - C:\Users\Admin\AppData\Local\Temp\955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe
    "C:\Users\Admin\AppData\Local\Temp\955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe"
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:3024
  - - C:\Users\Admin\AppData\Local\Temp\955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe
      "C:\Users\Admin\AppData\Local\Temp\955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe"
      4⤵
      Suspicious use of SetThreadContext
      Suspicious use of WriteProcessMemory
      PID:4312
    - - C:\Users\Admin\AppData\Local\Temp\955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe
        
        "C:\Users\Admin\AppData\Local\Temp\955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe" /scomma C:\Users\Admin\AppData\Local\Temp\data.dmp
        5⤵
        
        PID:676
    - - C:\Users\Admin\AppData\Local\Temp\955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe
        
        "C:\Users\Admin\AppData\Local\Temp\955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe" /scomma C:\Users\Admin\AppData\Local\Temp\data1.dmp
        5⤵
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:3664
    - - C:\Users\Admin\AppData\Local\Temp\955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe
        
        "C:\Users\Admin\AppData\Local\Temp\955bd07aa4b5e9d32816a3aab416b16559d79ed8979ef655f5b82edbc059e859.exe" /scomma C:\Users\Admin\AppData\Local\Temp\data2.dmp
        5⤵
        Accesses Microsoft Outlook accounts
        
        PID:1340

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

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\WGTFAHDGK.TMz

Filesize
2KB

MD5
9dae05249eb9020641aed5ad5270ad85

SHA1
78d400b62219898420a53af2d20f93aa2be2c31a

SHA256
3cceb58085b04a6ed5054dd2bdbbcc35b9e0e7c50324702a57c2f121da4805fa

SHA512
b5acc0c9a65144dca5af0ec43d776921903b3f8147fb023cd2e2e438ea580148d40a021421516088c6a21f09dcf66772346e41e48625c02e8174092a9d7f3156

Download Submit
C:\Users\Admin\AppData\Local\Temp\WGTFAHDGK.TMz

Filesize
2KB

MD5
9dae05249eb9020641aed5ad5270ad85

SHA1
78d400b62219898420a53af2d20f93aa2be2c31a

SHA256
3cceb58085b04a6ed5054dd2bdbbcc35b9e0e7c50324702a57c2f121da4805fa

SHA512
b5acc0c9a65144dca5af0ec43d776921903b3f8147fb023cd2e2e438ea580148d40a021421516088c6a21f09dcf66772346e41e48625c02e8174092a9d7f3156

Download Submit
C:\Users\Admin\AppData\Local\Temp\data.dmp

Filesize
54B

MD5
c10dbeca73f8835240e08e4511284b83

SHA1
0032f8f941cc07768189ca6ba32b1beede6b6917

SHA256
0b6b62094048f0a069b4582f837afcb941db51340d0b16d578e8cbe8603a071e

SHA512
34f7ab8b4ab7b4996b82ffc49198103ef245ee7dd5ccfec793a9ee391b9e9bb30bd3916b4ebeaa9c66a4b5ca42f8572418f16dc83d41073bc94389c19916b967

Download Submit
memory/548-134-0x0000000000400000-0x0000000000473000-memory.dmp

Filesize
460KB

Download
memory/548-145-0x0000000000400000-0x0000000000473000-memory.dmp

Filesize
460KB

Download
memory/676-169-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/676-156-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/676-149-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/676-153-0x0000000000400000-0x0000000000454000-memory.dmp

Filesize
336KB

Download
memory/1340-164-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1340-167-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1340-163-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1340-158-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1340-166-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1340-168-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3024-172-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/3024-146-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/3024-171-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/3024-137-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/3664-152-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/3664-159-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/3664-165-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/3664-161-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/4312-144-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/4312-162-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/4312-154-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/4312-143-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download
memory/4312-142-0x0000000000400000-0x000000000045F000-memory.dmp

Filesize
380KB

Download