714610967a72142fad9a338417019df3fd299a38ee391317020530dccf6f905e

General

Target
jaffacakes118_Trojan-Downloader.Win32.Smasoft.12.exe
Size 16KB
Sample261006-q4k7msfb65
SHA256 714610967a72142fad9a338417019df3fd299a38ee391317020530dccf6f905e
MD5 75552d1b3ef0fccb893dd6e6e771153e
SHA1 193cd58af2072aa4da7fdc01e5d0acb527c75a47
SHA512 6edc5f8999b6c05f804b060d347cd7c592ea58d82ed1e627d4095b90264f2ecddd23af799d9fd1742fb58d05f56988ec741bbb70bb4e4e2ec9c5e8c00fe22c57
SSDEEP 384:2YV+TRgOtwVZWbCnam9lCOzhm6oXFvl6J8pLwd6HR5:RVgRgiWqCz3CcMuUTx5
TLSH
T14F729D4713449540C4E397B10191EA471EB9D7ADA6D13BF49A3F77226A8B303372C30B
MD5 SHA1 SHA512 SSDEEP TLSH

Score

7^/10

Malware Config

Signatures

Executes dropped EXE 2 IoCs

pid	Process
6096	regsvc32.exe
5880	regsvc32.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Generic = "C:\\Windows\\regsvc32.exe"	jaffacakes118_Trojan-Downloader.Win32.Smasoft.12.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/2444-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/files/0x002800000001c426-2.dat	upx
behavioral2/memory/2444-5-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/6096-16-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/5880-27-0x0000000000400000-0x0000000000411000-memory.dmp	upx

Drops file in Windows directory 4 IoCs

description	ioc	Process
File created	C:\Windows\regsvc32.exe	jaffacakes118_Trojan-Downloader.Win32.Smasoft.12.exe
File created	C:\Windows\regsvc32BK.DAT	regsvc32.exe
File created	C:\Windows\mymok.exe	regsvc32.exe
File created	C:\Windows\mymok.exe	regsvc32.exe

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

System Information Discovery
T1082

Reads the TCP/IP host and domain name from the registry 1 TTPs 4 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	regsvc32.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	regsvc32.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	regsvc32.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	regsvc32.exe

System Location Discovery: System Language Discovery 1 TTPs 3 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	jaffacakes118_Trojan-Downloader.Win32.Smasoft.12.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvc32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvc32.exe

Suspicious use of WriteProcessMemory 1 IoCs

description	pid	Process	procid_target
PID 2444 wrote to memory of 6096	2444	jaffacakes118_Trojan-Downloader.Win32.Smasoft.12.exe	89

C:\Users\Admin\AppData\Local\Temp\jaffacakes118_Trojan-Downloader.Win32.Smasoft.12.exe
"C:\Users\Admin\AppData\Local\Temp\jaffacakes118_Trojan-Downloader.Win32.Smasoft.12.exe"
1⤵
- Adds Run key to start application
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2444
- C:\Windows\regsvc32.exe
  "C:\Windows\regsvc32.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in Windows directory
  - Reads the TCP/IP host and domain name from the registry
  - System Location Discovery: System Language Discovery
  PID:6096

C:\Windows\regsvc32.exe
C:\Windows\regsvc32.exe
1⤵
- Executes dropped EXE
- Drops file in Windows directory
- Reads the TCP/IP host and domain name from the registry
- System Location Discovery: System Language Discovery
PID:5880

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

mymok.exe

Path C:\Windows\mymok.exe
Size 138B
SHA256 301bd9f16f94feedfae7a946a14bac38cb73c43efe6117bc5586835af03d7d6f
MD5 7389d931c86b3d7bb6b8af46d8c4172b
SHA1 8d2a4760aa0b47984d11cd1a66448719177fb791
SHA512 dd6d1511e4fcd5bc09d821ffe091fb5946ac9654c48664aed504e479e9ac20c1cad44b6df90f42190d47e28f5f96bfb09d24056df6b950243d68ee8100a9a889
TLSH
T1D9C09B5D755366449913155167C33641D196837F689A84510941C593F0CF69AC4C73A9
MD5 SHA1 SHA512 TLSH

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regsvc32.exe

Path C:\Windows\regsvc32.exe
Size 16KB
SHA256 714610967a72142fad9a338417019df3fd299a38ee391317020530dccf6f905e
MD5 75552d1b3ef0fccb893dd6e6e771153e
SHA1 193cd58af2072aa4da7fdc01e5d0acb527c75a47
SHA512 6edc5f8999b6c05f804b060d347cd7c592ea58d82ed1e627d4095b90264f2ecddd23af799d9fd1742fb58d05f56988ec741bbb70bb4e4e2ec9c5e8c00fe22c57
SSDEEP 384:2YV+TRgOtwVZWbCnam9lCOzhm6oXFvl6J8pLwd6HR5:RVgRgiWqCz3CcMuUTx5
TLSH
T14F729D4713449540C4E397B10191EA471EB9D7ADA6D13BF49A3F77226A8B303372C30B
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

regsvc32BK.DAT

Path C:\Windows\regsvc32BK.DAT
Size 16KB
SHA256 d3bbac21af1484297a6cb550ed9bd1f2236b3054ebe223c81bed588f9a9276e1
MD5 d56f94797ecaf7fc0e5ac07be72af8e8
SHA1 a64a090e92ff3562fabd03e711c18dd6e28b9f84
SHA512 59166cd5d922c46ab8ff417a6ec81b0a5ce144481161b537eef5504cd826033860860dac3de17d11e1748e7c8ba5bd1804ca109f44c48432125d886bf258698c
SSDEEP 384:uYV+TRgOtwVZWbCnam9lCOzhm6oXFvl6J8pLwd6HR5:pVgRgiWqCz3CcMuUTx5
TLSH
T1B7729D4713449540C4E397B10191EA471EB9D7ADAAD13BF49A3F77226A8B303372C30B
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/2444-0-0x0000000000400000-0x0000000000411000-memory.dmp

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memory/2444-5-0x0000000000400000-0x0000000000411000-memory.dmp

Download

memory/5880-27-0x0000000000400000-0x0000000000411000-memory.dmp

Download

memory/6096-16-0x0000000000400000-0x0000000000411000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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