isrstealer | 0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc

Analysis

max time kernel
155s
max time network
162s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
27/11/2022, 13:20

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General

Target
0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc.exe
Size 318KB
Sample221127-qlgfqsag44
SHA256 0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc
MD5 d71366f5eece0973d076ecb08e4894b4
SHA1 5192fea16a9f8244d2e6a4eaaf87655cecd1f13f
SHA512 3e00aaebe6d2c85c0ed0c4b1989bc3b2390c367aa4226758b5c8d3dee064e8003efacfdf10001752bb5578e2b431676e34eef80e8ad03edb3e3cdea2b56936dc
SSDEEP 6144:Ji3GW+lMXFj7cttK3JnSjTIJB6Jeht3h/dSYOY4IpQOvG8f1RRO:sl+c57c/KdWTIJ4JehttX7QOvHf
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

isrstealer collection 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/2192-135-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/2192-142-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/2192-148-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/2192-155-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/332-153-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/332-154-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral2/memory/332-153-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/332-154-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 8 IoCs

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

upx

resource	yara_rule
behavioral2/memory/5096-140-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/5096-143-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/5096-144-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/5096-145-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/332-150-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/332-152-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/332-153-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/332-154-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Drops startup file 1 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\cb72t6bIX.lnk	0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc.exe

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	Cvtres.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 3408 set thread context of 2192	3408	0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc.exe	79
PID 2192 set thread context of 5096	2192	Cvtres.exe	80
PID 2192 set thread context of 332	2192	Cvtres.exe	82

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

System Information Discovery
T1082

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2192	Cvtres.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 3408 wrote to memory of 2192	3408	0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc.exe	79
PID 3408 wrote to memory of 2192	3408	0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc.exe	79
PID 3408 wrote to memory of 2192	3408	0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc.exe	79
PID 3408 wrote to memory of 2192	3408	0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc.exe	79
PID 3408 wrote to memory of 2192	3408	0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc.exe	79
PID 3408 wrote to memory of 2192	3408	0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc.exe	79
PID 3408 wrote to memory of 2192	3408	0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc.exe	79
PID 2192 wrote to memory of 5096	2192	Cvtres.exe	80
PID 2192 wrote to memory of 5096	2192	Cvtres.exe	80
PID 2192 wrote to memory of 5096	2192	Cvtres.exe	80
PID 2192 wrote to memory of 5096	2192	Cvtres.exe	80
PID 2192 wrote to memory of 5096	2192	Cvtres.exe	80
PID 2192 wrote to memory of 5096	2192	Cvtres.exe	80
PID 2192 wrote to memory of 5096	2192	Cvtres.exe	80
PID 2192 wrote to memory of 5096	2192	Cvtres.exe	80
PID 2192 wrote to memory of 332	2192	Cvtres.exe	82
PID 2192 wrote to memory of 332	2192	Cvtres.exe	82
PID 2192 wrote to memory of 332	2192	Cvtres.exe	82
PID 2192 wrote to memory of 332	2192	Cvtres.exe	82
PID 2192 wrote to memory of 332	2192	Cvtres.exe	82
PID 2192 wrote to memory of 332	2192	Cvtres.exe	82
PID 2192 wrote to memory of 332	2192	Cvtres.exe	82
PID 2192 wrote to memory of 332	2192	Cvtres.exe	82

C:\Users\Admin\AppData\Local\Temp\0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc.exe
"C:\Users\Admin\AppData\Local\Temp\0b7669696883c3a853a6d06d3adafa79a2236baef0d448bffd1ac8574dcb64cc.exe"
1⤵
- Drops startup file
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3408
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\Cvtres.exe
  "C:\Windows\Microsoft.NET\Framework\v2.0.50727\Cvtres.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2192
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\Cvtres.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\AA8ntI9l9E.ini"
    3⤵
    PID:5096
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\Cvtres.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\RRcWnQpfEk.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:332

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Email Collection

T1114

Command and Control

Exfiltration

Impact

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Downloads

AA8ntI9l9E.ini

Path C:\Users\Admin\AppData\Local\Temp\AA8ntI9l9E.ini
Size 5B
SHA256 fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba
MD5 d1ea279fb5559c020a1b4137dc4de237
SHA1 db6f8988af46b56216a6f0daf95ab8c9bdb57400
SHA512 720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3
MD5 SHA1 SHA512

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memory/332-154-0x0000000000400000-0x000000000041F000-memory.dmp

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memory/332-150-0x0000000000400000-0x000000000041F000-memory.dmp

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memory/332-152-0x0000000000400000-0x000000000041F000-memory.dmp

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memory/332-153-0x0000000000400000-0x000000000041F000-memory.dmp

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memory/2192-135-0x0000000000400000-0x0000000000442000-memory.dmp

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memory/2192-142-0x0000000000400000-0x0000000000442000-memory.dmp

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memory/2192-155-0x0000000000400000-0x0000000000442000-memory.dmp

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memory/2192-148-0x0000000000400000-0x0000000000442000-memory.dmp

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memory/3408-132-0x0000000075010000-0x00000000755C1000-memory.dmp

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memory/3408-147-0x0000000075010000-0x00000000755C1000-memory.dmp

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memory/3408-133-0x0000000075010000-0x00000000755C1000-memory.dmp

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memory/5096-140-0x0000000000400000-0x0000000000453000-memory.dmp

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memory/5096-145-0x0000000000400000-0x0000000000453000-memory.dmp

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memory/5096-144-0x0000000000400000-0x0000000000453000-memory.dmp

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memory/5096-143-0x0000000000400000-0x0000000000453000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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